The GMM 20 – vvvvvvvvtv 9 hhs 999.9.xx Ethernet module from Hirschmann is a unique value in the field of industrial network communication. Although the meaning of some of the characters in the model number is not clear at the moment, it is possible to analyse them in depth based on the consistent characteristics of Hirschmann products.

Ports and Transmission Characteristics
Port Types and Layout: With reference to other Hirschmann Ethernet modules, the GMM 20 – vvvvvvvvvtv 9 hhs 999.9.xx is most likely equipped with an abundance of ports. an RJ45 port is likely to be the standard configuration, used for connecting common twisted-pair cables. This type of port is widely used in industrial cabling, featuring lower cost and easy connection, and is suitable for short distances and for scenarios where the transmission rate requirement is within a certain range. For example, in the workshop between the equipment of the close connection, through the RJ45 port with twisted-pair cable, can quickly set up a data transmission link.

At the same time, considering the long distance transmission and anti-interference requirements, the module is likely to have a fibre optic port, such as SC or ST type. In some large factories, different workshops are far away from each other, and there are a lot of electromagnetic interference sources, this time the fibre-optic port with fibre-optic cable can ensure stable, high-speed data transmission, effectively avoiding signal attenuation and interference. From the perspective of port layout, Hirschmann products usually focus on rationality, the RJ45 port and optical fibre ports are clearly set up in separate areas, and the ports are marked with clear functional identification, which is convenient for installers to complete the wiring work quickly and accurately, and to reduce the installation errors caused by port confusion.

Transmission Rate Specifications: Based on Hirschmann’s technical strength and past performance in the industrial Ethernet field, the GMM 20 – vvvvvvvvtv 9 hhs 999.9.xx Ethernet module is expected to support a variety of high-speed transmission rates. It will most likely support 10Mbps and 100Mbps rates to meet some industrial scenarios that require relatively low data transmission speeds but focus on stability and cost control, such as data acquisition and transmission of some simple devices in traditional manufacturing.

More critically, the module is likely to support 1Gbps or even higher transmission rates. As the degree of industrial automation continues to increase, a large number of devices generate massive amounts of data that need to be processed and transmitted quickly. In the automated assembly line of an automobile manufacturing plant, many robots, sensors and control systems frequently interact with each other, and a transmission rate of 1Gbps or higher can ensure the efficient coordination of the entire production process, avoiding production stagnation or errors due to delays in data transmission, and greatly improving production efficiency and product quality.

Network Adaptation and Reliability Design
Network protocol compatibility: Hirschmann’s Ethernet modules are known for their strong network protocol compatibility, and the GMM 20 – vvvvvvvvtv 9 hhs 999.9.xx is no exception. It fully supports TCP/IP, UDP, ICMP and many other common network protocols. This feature allows the module to be easily integrated into complex industrial network architectures. In some large industrial enterprises, there may be a variety of equipment and systems of different ages and standards, each using different network protocols to communicate. gmm 20 – vvvvvvvvvvtv 9 hhs 999.9.xx module, with its wide range of protocols supported, can achieve seamless integration with these devices and systems, and ensure that the entire industrial network is interconnected.

For example, if a factory has old equipment using traditional industrial network protocols and introduces new equipment using the latest Ethernet standard protocols, the module can serve as a key hub to ensure smooth data interaction between the different protocols, avoiding system modification problems and high costs due to incompatible protocols.

Redundancy and Fault Diagnosis Mechanism: In terms of reliability design, the GMM 20 – vvvvvvvvtv 9 hhs 999.9.xx Ethernet module adopts advanced redundancy design concepts. In the power supply section, it is usually equipped with redundant power supply modules or supports dual power inputs. When the main power supply fails, the backup power supply can be seamlessly switched over in a very short period of time to guarantee the continuous and stable operation of the module, and to avoid interruption of data transmission due to power interruptions, which is crucial for some critical industrial production processes that cannot be easily shut down. In terms of link redundancy, the module may support link aggregation technology, which bundles multiple physical links into one logical link, not only increasing the link bandwidth, but also providing link redundancy.

When one of the physical links fails, the data can be automatically switched to other normal links for transmission, ensuring the continuity of network communication. In addition, the module has a powerful self-diagnostic function, through the internal integration of intelligent monitoring chip and software algorithms, it can monitor its own hardware status in real time, such as whether the port is damaged, whether the chip temperature is too high, whether the memory read and write is normal. At the same time, it can also accurately diagnose faults at the network level, such as network congestion, abnormal packet loss rate, protocol errors and so on. Once a fault is detected, the module will immediately notify the operation and maintenance personnel through indicators, alarm messages and other means, and in the diagnostic report, it points out in detail the type of fault, the location of the occurrence of the fault and the possible causes, which provides a strong support for the rapid troubleshooting and repair of the problem, and greatly improves the efficiency and stability of the operation and maintenance of the industrial network.

Application Scenario Analysis
Industrial automation production line: In the field of industrial automation, the GMM 20 – vvvvvvvvtv 9 hhs 999.9.xx Ethernet module plays a central role. It is used to connect programmable logic controllers (PLC), sensors, actuators and other key devices to build an efficient and stable industrial control system. In the production line, sensors collect various data in the production process in real time, such as temperature, pressure, position, speed, etc., which are quickly transmitted to the PLC through the Ethernet module. the PLC analyses and processes the data according to the preset program logic and sends precise control instructions to the actuators to achieve the automated control of the production process.

For example, in a food and beverage production line, the sensors connected to the module can monitor the filling level, cap tightening strength and other parameters in real time, and the PLC adjusts the operating status of the equipment according to these data to ensure the consistency of product quality. At the same time, the module’s high-speed transmission capacity and stability, to ensure that in the high-speed operation of the production line, a large number of data fast and accurate transmission, to avoid production errors or equipment failure due to data delays, effectively improve production efficiency and reduce labour costs.

Intelligent transport system: In the field of intelligent transport, especially rail transport, GMM 20 – vvvvvvvvvtv 9 hhs 999.9.xx Ethernet module undertakes the key data transmission task. During train operation, the train control system needs to communicate with the signalling system on the ground in real time to obtain important information such as line signals, speed limits, turnout status, etc., in order to ensure safe and efficient train operation. The module can ensure the fast and stable transmission of these key data between the train and the ground to achieve precise control and scheduling of the train. Meanwhile, in the train compartment, the real-time video data collected by the video surveillance system also needs to be transmitted to the monitoring centre through the Ethernet module, so as to discover and deal with abnormal situations in the compartment in time. In addition, in the intelligent car park management system, the module can be connected to vehicle detection equipment, gate controller and management server. Vehicle detection equipment through the Ethernet module will vehicle in and out of the information quickly transmitted to the management server, the server according to this information to control the opening and closing of the road gate, and parking billing and other operations, which greatly improves the management efficiency of the car park and the level of intelligence.

Energy and Power Industry: In the energy and power industry, GMM 20 – vvvvvvvvvtv 9 hhs 999.9.xx Ethernet modules are widely used in substations, power plants, and all aspects of the smart grid. In substations and power plants, various power equipment, such as transformers, circuit breakers, generators, etc., need to transmit their operating status data and power parameters to the monitoring centre in real time.

The module can guarantee the stable and high-speed transmission of these data in the complex electromagnetic environment, and the operation and maintenance personnel can grasp the operation of the equipment in real time through the system of the monitoring centre, carry out fault warning and equipment maintenance, and ensure the reliable operation of the power system. In the construction of smart grid, a large number of smart meters upload users’ electricity consumption data to the management system of the power company through the Ethernet module to achieve remote meter reading and electricity consumption data analysis. The power company can carry out operations such as load forecasting, electricity billing and grid optimisation scheduling based on these data, which improves the intelligent management level of the power system, reduces operating costs and improves the quality and reliability of power supply.

Intelligent Building Field: In intelligent buildings, the GMM 20 – vvvvvvvvvtv 9 hhs 999.9.xx Ethernet module becomes a key component in realising intelligent building management. It can connect multiple sub-systems such as lighting system, air-conditioning system, security system, etc. in the building. By connecting with the lighting system, it can realise intelligent control of the lighting equipment according to the ambient light and people’s activities by using the data transmitted by the module to automatically adjust the brightness of the light and the switching state, so as to achieve the dual purpose of energy saving and comfort.

When connected to the air-conditioning system, the module can transmit real-time indoor temperature, humidity and other environmental parameters, and the air-conditioning system automatically adjusts the operation mode according to these data to provide users with a comfortable indoor environment, while achieving energy saving and emission reduction. In terms of security system, the module quickly transmits video data collected by cameras and card swipe information from the access control system to the monitoring room to safeguard the safety of people and property in the building. The integrated control of each sub-system through the Ethernet module realises comprehensive intelligent management of the building, creating a more convenient, comfortable and safe living and working environment for users.

Hirschmann has a longstanding reputation in the field of industrial networking. The brand’s deep background, strong technological innovation and a wide range of product applications have made it an important player in the global market.

History: Founded in 1924, Hirschmann initially focused on communication connector technology, installing the world’s first Ethernet with fibre-optic connection for the University of Stuttgart in 1984, launching the Ethernet ring network in 1990, and developing the first converters for fieldbus systems in 1993. Since then, Hirschmann has been at the forefront of industrial network electronics.

Innovations: Hirschmann is a pioneer and leader in industrial network technology, with the creation of the world’s first fibre-optic Ethernet in 1984 and the introduction of HIPER-Ring in 1990, innovations that laid the foundations for the development of industrial Ethernet and kept Hirschmann at the forefront of technology.

Product range: A comprehensive portfolio of data communication products ranging from Gigabit Ethernet, Fast Ethernet and Ethernet products to fieldbus systems and ASI connectors for actuators and sensors. Industrial Ethernet switches are one of the core products, including unmanaged, managed, DIN-rail, and rack-mounted types to meet different industrial scenarios and network requirements.

Port Configuration: It may be equipped with several different types of ports to meet the diverse connection needs of industrial equipment. Common Hirschmann industrial Ethernet switches have RJ45 ports with 10/100/1000Mbps adaptive rate, which are suitable for connecting all kinds of devices in the industrial field, such as sensors, controllers, servers and so on. There may be optical fibre ports, such as SFP (Small Form-factor Pluggable) ports, which support multi-mode or single-mode optical fibre connection to meet the requirements of long-distance transmission and high-speed data communication, and are suitable for connecting equipment in different plants or over long distances. Some models are also available with an M12 interface, which offers good protection and is suitable for connecting equipment in harsh environments, such as outdoors or in places subject to mechanical vibrations.

Data exchange capability: Supports full-duplex and half-duplex communication modes, users can choose the appropriate mode according to the device connection and network environment to optimise network performance. With a high data forwarding rate, it can quickly process large amounts of data to meet the demand for real-time data transmission in industrial automation scenarios and ensure the efficient operation of the production process. Higher backplane bandwidth and packet forwarding rate ensure high efficiency and stability when multiple ports transmit data at the same time, avoiding data congestion and loss.

Environment Adaptability: As an industrial grade switch, it has the ability to work in a wide range of temperatures, the operating temperature range may be – 40°C to + 70°C, and it can be stably operated in harsh environments, such as cold outdoor or high-temperature industrial plants. The protection level reaches IP65/IP67 standard, with good dustproof and waterproof performance, which can effectively resist dust, water splash and short time immersion, and adapt to a variety of complex industrial environments. Strong anti-vibration and anti-shock ability, in line with industrial standards, can work normally in places with vibration and shock (such as factory production lines, rail vehicles).

Network protocol support: Support VLAN (Virtual Local Area Network) function, which can divide the network into multiple logical subnets to improve network security and management efficiency, such as dividing equipment in different production areas into different VLANs to achieve data isolation and traffic control. Equipped with QoS (Quality of Service) function, it can assign different priorities to different types of data (e.g. voice, video, control commands, etc.) to ensure that critical data is transmitted first. Supports redundant protocols such as Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP), which can automatically detect loops in the network and prevent network loops by blocking certain ports, improving network stability and reliability. It supports port mirroring function, which is convenient for network administrators to monitor and analyse the network traffic, and discover network failures and abnormalities in time.

Management Function: Support SNMP (Simple Network Management Protocol) to achieve remote network management, administrators can monitor and configure the switch through the network, such as checking the port status and traffic statistics. Web management interface, intuitive and convenient operation, no need for professional command line operation skills, lowering the threshold of management. Supports CLI (Command Line Interface) configuration, providing professional network engineers with more accurate and flexible configuration methods to meet the advanced configuration needs in complex network environments.

Hirschmann MM20-m2 t1 t1 sahh managed Ethernet switches
Port Configuration: 4 M12 D-coded Ethernet ports with 10/100 Mbps transmission rate, which are suitable for connecting industrial devices that do not require extremely high transmission rate but need certain anti-interference ability, such as field sensors, small controllers, etc. 4 M12 X-coded Ethernet ports with a transmission rate of up to 1,000 Mbps, which can meet the needs of high-speed data transmission, such as high-definition cameras, industrial robots. 2 Gigabit copper ports (RJ45 interface), which can be used to transmit data, such as HD cameras, industrial robots. 4 M12 X-coded Ethernet ports with a speed of up to 1000 Mbps, which can meet the demand for high-speed data transmission of devices, such as high-definition cameras, industrial robots, etc. 2 Gigabit copper ports (RJ45 connector), which can be used to connect servers, routers and other devices, to facilitate the construction of a high-speed and stable network backbone link.

Data exchange capability: supports full-duplex and half-duplex modes, which can be flexibly selected by users according to the connection requirements of the devices and the network environment, providing convenience in terms of device compatibility and network resource utilisation. High-speed data transmission performance, suitable for industrial automation and transport systems and other areas requiring high real-time data, to ensure that a large amount of data can be transmitted quickly and stably.
Power supply and power consumption: The input voltage is 24V DC, which is a common power supply specification in the industrial field, and is easy to be connected to the existing power supply system of the factory. Typical operating power consumption is low, which meets the needs of energy-efficient industrial networks and can effectively reduce operating costs.

Environmental compatibility: The operating temperature range of -40°C to +70°C allows the unit to operate in cold outdoor environments or in hot industrial plants under severe temperature conditions. The protection level meets IP65/IP67 standard, with excellent dustproof and waterproof ability, which can effectively resist dust, water splash and other external factors. Anti-vibration and anti-shock performance in line with industrial standards, vibration and shock in industrial environments (such as factories, production lines, rail vehicles) can also operate stably.

Network protocol support: VLAN (Virtual Local Area Network), which can divide the network into multiple logical subnets to improve network security and management efficiency, such as dividing equipment in different production areas into different VLANs to achieve data isolation. Supports QoS (Quality of Service), which assigns different priorities to different types of data (e.g., voice, video, control commands, etc.) to ensure the transmission quality of critical data. Supports port mirroring, which is convenient for network administrators to monitor and analyse network traffic and detect network failures or abnormalities in time. Support RSTP (Rapid Spanning Tree Protocol), MSTP (Multiple Spanning Tree Protocol) and other redundancy protocols to enhance network stability, and when a link failure occurs in the network, it can be quickly switched to the backup link to ensure that network communication is not interrupted.

Management Function: Support SNMP (Simple Network Management Protocol), which can realise remote network management, and administrators can monitor and configure the switch through the network. Web management interface, intuitive and convenient operation, no need for professional command line operation skills, reducing the threshold of management. Supports CLI (command line) configuration, providing professional network engineers with more accurate and flexible configuration methods.

Applicable Scenarios: In the field of industrial automation, it is suitable for factory production lines and automation control systems, which can realise efficient interconnection of all kinds of equipments and ensure real-time transmission of data and timely issuance of control commands in the production process. In the field of rail transport and traffic management, it can be deployed in train communication, underground signalling system, road monitoring and other scenarios to ensure the reliable operation of the transport system. In the field of energy and public utilities, it is suitable for substation automation and remote monitoring system to ensure the network stability of energy supply and facility monitoring. In intelligent buildings and security monitoring, it can ensure stable networking of security monitoring equipment and real-time monitoring and security protection of buildings.

Various port configurations: Equipped with 4 M12 D-coded Ethernet ports with a transmission rate of 10/100 Mbps. These ports are widely used in industrial sites to provide stable and adaptable network transmission speeds when connecting devices such as sensors and small controllers. For example, in factory automation lines, a large number of temperature and pressure sensors can be connected to the control system through these ports to ensure that the collected data is transmitted in a timely manner. 4 M12 X-coded Ethernet ports with a speed of up to 1000 Mbps are suitable for connecting bandwidth-demanding devices, such as high-definition cameras, industrial robots, and so on. In the machine vision inspection of smart factories, a large amount of image data generated by HD cameras can be quickly transmitted through these high-speed ports to meet the needs of real-time inspection and analysis. There are also 2 Gigabit copper ports (RJ45 ports), which are convenient for connecting core network devices such as servers and routers, facilitating the construction of a high-speed and stable network backbone link, and realising efficient data interaction between different network areas.

Powerful data exchange capability: Supports full-duplex and half-duplex modes, which can be flexibly selected by users according to the actual needs of equipment connection and network environment. It provides great convenience in device compatibility and network resource utilisation. In industrial networks where old and new devices are mixed, the appropriate working mode can be selected according to the communication modes of different devices to ensure network interconnection. With high-speed data transmission performance, it is suitable for industrial automation and transport systems and other fields that require high real-time data. In the automated production line of automobile manufacturing, a large amount of control commands and production data need to be interacted in real time among various devices, and the switch can ensure the fast and stable transmission of such data to guarantee the efficient and stable operation of the production line.

Outstanding environmental adaptability: With an operating temperature range of -40°C to +70°C, the switch can work normally in cold outdoor environments (e.g., connecting network devices in polar research stations) or hot industrial plants (e.g., steel smelting workshops), ensuring uninterrupted network connections. The protection level meets IP65/IP67 standard, with excellent dustproof and waterproof ability. In dusty mining environments or on the decks of ships prone to water splashes, it can effectively resist the intrusion of dust and water, protect the internal circuitry and extend the service life of the equipment. Anti-vibration and anti-shock performance in line with industrial standards, in the vibration and shock of industrial environments (such as factories, production lines, rail vehicles), can be solidly maintained in the working state, to maintain the stable operation of the network.

Comprehensive network protocol support: Support for VLAN (Virtual Local Area Network) allows users to divide the network into multiple logical subnets to improve network security and management efficiency. For example, in large factories, devices in different production areas can be divided into different VLANs to achieve data isolation, preventing data interference between different areas and facilitating traffic control and resource allocation. It supports QoS (Quality of Service), which assigns different priorities to different types of data (e.g., voice, video, control commands, etc.) to ensure the transmission quality of critical data. In remote monitoring systems, video data and control commands can be given higher priority to ensure smooth monitoring images and timely delivery of control commands. Support port mirroring function, which is convenient for network administrators to monitor and analyse network traffic, detect network failure or abnormality in time, and ensure normal operation of the network. Support RSTP (Rapid Spanning Tree Protocol), MSTP (Multiple Spanning Tree Protocol) and other redundant protocols to enhance network stability. When a link failure occurs in the network, it can be quickly switched to the backup link to ensure that network communication is not interrupted, and enhance the reliability of the network.

Convenient and efficient management function: Support SNMP (Simple Network Management Protocol), which can achieve remote network management, administrators can monitor and configure the switch through the network, without the need to visit the site, improving management efficiency. Web management interface, intuitive and convenient operation, no need for professional command line operation skills, lowering the threshold of management, ordinary technicians can easily get started. Supports CLI (command line) configuration, providing professional network engineers with more accurate and flexible configuration methods to meet the advanced configuration needs of complex network environments.

Heat dissipation speculation
Natural Heat Dissipation: Many industrial Ethernet switches use natural heat dissipation, which is achieved by the large metal surface area of the device casing. MM20-M2T1T1SAHH may also make use of this method, as its casing is designed to have a large surface area for heat dissipation, and the metal casing is able to absorb the heat generated by the switch’s internal electronic components quickly, and emit the heat into the surrounding air. This way, in some industrial scenarios where the heat dissipation requirements are not particularly high and the ambient temperature is relatively stable, natural heat dissipation alone can satisfy the temperature requirements for normal operation of the switch. For example, in the indoor office automation network environment where the heat generated by the equipment is small, the natural heat dissipation can ensure the stable operation of the switch.

Heat sinks: To enhance heat dissipation, some of Hirschmann’s switches may be equipped with heat sinks on key heat-generating components. the MM20 – M2T1T1SAHH may also be equipped with heat sinks, which are usually made of metals with good thermal conductivity, such as aluminium or copper. They fit snugly on the surface of heat-generating components like chips, greatly increasing the heat dissipation area and speeding up the rate at which heat is dissipated. When the switch is in operation, heat is conducted from the heating element to the heat sink, and then emitted from the heat sink to the surrounding environment, effectively reducing the temperature of the component.

Optimisation of heat dissipation in a compact structure: Considering the compact design of the switch and its limited internal space, the design of the heat dissipation system needs to make full use of the limited space. A design that combines heat dissipation channels with the internal layout may be adopted to ensure that air can flow reasonably inside the switch and carry away heat. For example, the design of the circuit board will plan the location of heat-generating components so that air can flow smoothly through these components to improve heat dissipation efficiency. At the same time, reasonable arrangement of internal wiring, to avoid the line to block the air flow, to ensure that the heat can be smoothly transferred to the shell or heat sink for dissemination.

Adaptation to harsh environments: As an industrial switch, it needs to work in a variety of harsh environments, and its heat dissipation system should be able to adapt to different environmental conditions. In a high temperature environment, the cooling system should ensure that the switch will not overheat and performance degradation or failure; in a low-temperature environment, it should prevent the electronic components from unstable performance due to low temperature. Therefore, the cooling system may have certain temperature adjustment functions, such as intelligent control of the heat dissipation efficiency of the heat sink, to maintain the appropriate working temperature inside the switch in different temperature environments.

Influence of Heat Sink on Switch Performance
Ensure stable operation: A good heat dissipation system is essential to maintain the stable operation of the switch. If the heat dissipation is poor and the internal temperature of the switch is too high, it will lead to the performance degradation of electronic components, data transmission errors, port failures and other problems, which will seriously affect the stability and reliability of the network. An effective heat dissipation system ensures that the internal temperature of the switch remains within a reasonable range over a long period of time, guaranteeing the normal operation of the ports and maintaining high-speed and stable data transmission.

Extend service life: A proper heat dissipation system helps to extend the service life of the switch. When the electronic components work under the appropriate temperature, their aging rate will be significantly slowed down, thus reducing the equipment failure caused by component damage.MM20 – M2T1T1SAHH’s cooling system can effectively control the temperature, which can reduce the failure rate of the components, so that the switch can operate stably for a long period of time in industrial environments, and reduce the cost of equipment replacement and maintenance.

Specification
Electrical Specifications
Power Input: Based on the wide range of Hirschmann’s products in the industrial field, the module is most likely to be compatible with common industrial power supply voltages, such as 24V DC, which is very common in industrial environments, making the module easily compatible with the existing power supply systems in most factories, without the need for additional complex power conversion equipment. For example, an automated production line network in an automotive factory can be powered directly from an existing 24V DC power supply. Considering the voltage fluctuations that may exist in industrial power supply environments, the power input range may be designed between 20.4V DC and 28.8V DC to ensure that the module can still maintain normal operation in the event of voltage instability.

Power Consumption: Given the need to support Ethernet communication and the possible port configurations, the power consumption of the module is estimated to be around 10W. Taking a common 8-port module as an example, the power consumption of each port in normal operation is about 1W, plus the power consumed by the internal circuitry of the module for data calculation, processing and other functions, the overall power consumption is at this level. This power consumption ensures that the module can efficiently perform all kinds of network tasks without adding too much burden to the power supply system, which is a good balance between industrial energy-saving requirements and the need for stable operation of equipment.

Port specifications
RJ45 port: If the module is equipped with an RJ45 port, the physical interface should comply with the IEEE 802.3 standard. The port’s transmission rate is 10/100 Mbps adaptive, automatically detecting the rate of the connected device and adapting it. In short-distance data transmission scenarios such as intra-office network connections, RJ45 ports can help devices quickly establish connections to the network. When using Cat5e or above cable, the theoretical transmission distance of this port can reach up to 100 metres, which is sufficient to meet the length requirements of general indoor network cabling.

Fibre-optic port (if available): If the module has a fibre-optic port, such as an SFP port, it may support both multi-mode fibre and single-mode fibre. Multi-mode optical fiber is suitable for short-distance high-speed data transmission scenarios, such as network connection within a building. When using OM3 multi-mode optical fiber, the transmission distance can be up to about 300 meters, which can meet the needs of short-distance high-speed connection between different buildings within a general campus network. Single-mode fibre is more suitable for long-distance transmission, and plays a key role in connecting industrial sites that are far away from each other or cross-city network connections, with transmission distances of up to tens of kilometres, such as the network connection between factories of large industrial groups distributed in different cities can be achieved with the help of single-mode fibre.

Network Specifications
Protocol support: The module undoubtedly supports IEEE 802.3 Ethernet protocol, which is the basic standard for Ethernet communication and ensures smooth communication with all kinds of devices complying with this standard. At the same time, it may support VLAN (Virtual Local Area Network) protocols, such as IEEE 802.1Q, which allows users to logically segment their networks to improve network security and management efficiency. In a large enterprise network architecture, dividing the network of different departments through VLANs can achieve data isolation, avoid inter-departmental data interference, and facilitate traffic control and rational allocation of network resources. In addition, it may also support Spanning Tree Protocol (STP, IEEE 802.1D), which is used to prevent loops in the network, ensure the stability of the network topology, and maintain the normal operation of the network by avoiding problems such as broadcast storms due to loops in complex network layouts.

MAC Address: Each port has a globally unique 48-bit MAC address, which is used to accurately identify the device in the network and ensure that data can be accurately transmitted to the target port. the uniqueness of the MAC address is assigned by the IEEE, which is like an exclusive ID card for the device, and is not duplicated globally, which strongly guarantees the accuracy and traceability of the network communication.

Environmental specifications
Operating temperature: As an industrial grade product, the module has excellent temperature adaptability, with a possible operating temperature range of – 40°C to + 70°C. This wide temperature range makes it suitable for use in a wide range of harsh industrial environments. Whether in an outdoor industrial facility in the cold north or on a factory floor in the hot south, the modules work well. For example, in the cold storage environment of the cold chain logistics industry, the module is able to operate stably at low temperatures to ensure the normal communication of the monitoring network; in the high-temperature steel smelting workshop, it is also able to withstand high temperatures and maintain the stability of the network connection.

Storage Temperature: The storage temperature range is likely to be wider, roughly – 45°C to + 85°C. This means that even when the equipment is not in use and is in storage, the module is able to maintain its performance in the face of extreme temperatures, ensuring that it will function properly when it is put into use.

Relative humidity: The module is capable of stable operation in non-condensing environments with relative humidity ranging from 5% to 95%. This means that in humid coastal factories or industrial environments with frequent changes in humidity, the module will not cause electrical short circuits or other failures due to humidity problems, ensuring the reliability of network communications.

Mechanical Specifications
Dimensions: Modules may be designed in a compact form factor to fit into a variety of industrial switches. For example, a common Hirschmann module size may be around 100mm long, 70mm wide and 25mm high, which is able to fit into most standard switch slots and achieve efficient deployment in limited switch space to meet the space utilisation needs of industrial users.
Weight: The estimated weight is around 150 grams, which is not only easy for installers to install and operate, but also easier to maintain in the later stage, and at the same time, it will not bring too much weight pressure to the switch, which ensures the overall stability of the equipment.

Technical Features
Industrial-grade reliability design: Hirschmann has been committed to the development and production of industrial network equipment, the module inherited its industrial-grade reliability gene. In the hardware design, high-quality electronic components are selected and undergo a strict screening and testing process to ensure stable operation in harsh environments. For example, its circuit boards may adopt special protective coatings to enhance dust, moisture and corrosion resistance, and can work stably for a long time even in dusty mining environments or high salt fog environments by the sea.

Flexible network topology support: the module may support a variety of network topologies, in addition to the common star topology, but also adapt to the ring topology. Taking ring topology as an example, when using Hirschmann’s unique HIPER-Ring (Super Redundant Ring) technology, it is able to form a 100Mbps/1000Mbps fast self-healing ring network. In the ring network, if a link failure occurs, the ring network can automatically resume normal operation within 500 milliseconds, to ensure the continuity of network communication, which is crucial for industrial automation production lines that require high real-time network performance.

Advanced network management function: It may support serial port network management, WEB-based network management, SNMP V1/V2/V3 and other network management methods. Through these management methods, network administrators can easily configure and monitor the modules. For example, with the WEB-based network management interface, administrators can intuitively adjust parameters such as port speed, VLAN settings, port mirroring, etc. Using the SNMP protocol, they can remotely monitor the module’s operation status, discover and solve potential problems in a timely manner, and improve network management efficiency.

Scenarios
Industrial automation production line: In automotive manufacturing, electronic equipment manufacturing and other industrial automation production lines, a large number of sensors, controllers, actuators and other devices are required for real-time data interaction and cooperative work. With its high-speed and stable communication capability, industrial-grade reliability and support for multiple network protocols, the Ethernet module can ensure the accuracy and timeliness of data transmission between various devices in the production line, and safeguard the efficient and stable operation of the production line. For example, in the automotive assembly line, the sensor real-time collection of data from each assembly link is rapidly transmitted to the controller through the module, and the controller makes decisions based on the data and gives commands to the actuator through the module to achieve accurate assembly.

Intelligent factory park network: For the intelligent factory park, it covers multiple functional areas such as office area, production area, storage area, etc., and the equipment in different areas need to be interconnected. The module’s multiple port types (RJ45 port for short-distance connection to office equipment and local industrial equipment; optical fibre port for long-distance connection to network equipment between different buildings) and support for complex network topologies can meet the needs of the intelligent factory park network construction and achieve seamless coverage and efficient communication throughout the park network.

Monitoring network in the field of transport: In ports, airports and other transport places, a large number of transport equipment and monitoring equipment need to be networked and monitored. The module’s wide-temperature operating characteristics, anti-jamming capability and redundant design enable it to operate stably in the complex electromagnetic environment and temperature change environment in the transport sector, guaranteeing reliable communication of the monitoring network and providing support for the safe and efficient operation of transport. For example, in the container loading and unloading monitoring system of the port, the module ensures that the video data collected by the camera can be stably transmitted to the monitoring centre, which facilitates the staff to grasp the loading and unloading operation in real time.

1. Electrical specifications
   Power input: It is possible to adapt to common industrial supply voltages such as 24V DC (direct current). This voltage specification is widely used in industrial environments and ensures compatibility with the existing power supply system in most factories, making it easy for equipment to be connected. For example, in the networking of a factory automation line, modules can be powered directly from an existing 24V DC supply without the need for additional complex power conversion equipment. Its power input range may be between 20.4V DC and 28.8V DC to adapt to a certain degree of voltage fluctuation, to ensure that the module can still work normally when there is voltage instability in the industrial power supply environment.
   Power Consumption: Considering the Ethernet communication function and port configuration, the estimated power consumption is around 10W. Taking the 8-port module as an example, the power consumption of each port under normal operation is about 1W, plus the power consumption required by the internal circuitry of the module for arithmetic, data processing and other functions, the overall power consumption is at this level. This level of power consumption ensures that the module operates efficiently without imposing an excessive burden on the power supply system, striking a balance between industrial energy saving and stable equipment operation.
2. Port specifications
   RJ45 port: If the module includes an RJ45 port, the physical interface complies with the IEEE 802.3 standard. The transmission rate of the port is 10/100 Mbps adaptive, which automatically detects the rate of the connected device and adapts it. In short-distance data transmission scenarios, such as intra-office network connections, the RJ45 port can easily and quickly connect devices to the network. The transmission distance of the port can theoretically reach up to 100 metres when using Cat5e and higher specification cables, which can meet the length requirements of general indoor network cabling.
   Fibre optic port (if available): If equipped with a fibre optic port, such as an SFP port, the supported fibre types may include multi-mode fibre and single-mode fibre. Multimode fibre is suitable for short-distance high-speed data transmission, which is more commonly used in the network connection inside the building, and the transmission distance can reach about 300 meters when using OM3 multimode fibre, which can meet the demand for short-distance high-speed connection between different buildings in the general campus network. Single-mode optical fibre is suitable for long-distance transmission, which is useful for connecting remote industrial sites or cross-city network connection, and the transmission distance can be up to tens of kilometres, for example, the network connection between different plants of large industrial groups.
3. Network specifications
   Protocol support: It must support IEEE 802.3 Ethernet protocol, which is the basic standard for Ethernet communication, ensuring that the module can communicate with all kinds of devices complying with this standard. Meanwhile, it may support VLAN (Virtual Local Area Network) protocol, such as IEEE 802.1Q, which is convenient for users to logically segment the network and improve network security and management efficiency. In large enterprise networks, VLANs can be used to delineate different departments of the network for data isolation and traffic control. In addition, it may support Spanning Tree Protocol (STP, IEEE 802.1D), which is used to prevent loops in the network, safeguard the stability of the network topology, and avoid problems such as broadcast storms in complex network structures.
   MAC Address: Each port has a unique 48-bit MAC address, which is used to identify the device in the network and ensure that data is transmitted to the destination port accurately and correctly.The uniqueness of the MAC address is assigned by the IEEE, and is like an ID card for the device, unique worldwide, ensuring the accuracy and traceability of network communications.
4. Environmental specifications
   Operating Temperature: Industrial grade temperature adaptability, with a possible operating temperature range of – 40°C to + 70°C. This temperature range allows the module to operate in harsh industrial environments, whether in cold northern outdoor industrial facilities or hot southern factory floors. For example, in a cold storage environment, the module can operate stably at low temperatures to ensure normal communication in a cold chain logistics monitoring network, and in a hot steel smelting plant, it can also withstand high temperatures to maintain network connectivity.
   Storage Temperature: The storage temperature range may be wider, from – 45°C to + 85°C. Even during the storage period when the equipment is not put into use, the module can maintain its performance in the face of extreme temperatures to ensure that it operates correctly when it is put into use.
   Relative humidity: Capable of operating in non-condensing environments from 5% to 95% relative humidity. This means that in humid coastal factories or industrial environments where humidity varies greatly, the module will not cause electrical short circuits or other failures due to humidity problems, ensuring the reliability of network communications.
5. Mechanical Specifications
   Size: The module’s external dimensions may be designed to be more compact to facilitate installation in various types of industrial switches. For example, a common Hirschmann module measures about 100mm in length, 70mm in width, and 25mm in height, which fits into most standard switch slots for efficient deployment in limited switch space.
   Weight: Estimated weight is around 150g, which is light enough for easy installation and maintenance without putting too much weight on the switch, ensuring the overall stability of the device.

Ethernet Connectivity and Port Configuration
Communication speed: The module is most likely designed to support Fast Ethernet communication. Given that its model number is similar to other Hirschmann media modules, it may be able to operate at 10/100Mbps, which is a common speed range for Fast Ethernet devices. This makes it suitable for application scenarios that require fast data transfer, such as in industrial control systems where real-time monitoring and control of production processes is critical. For example, in a manufacturing plant, sensors and actuators can communicate at high speeds with a central control unit through the module to ensure the smooth running of the production line.

These ports may be a combination of different types. For example, some ports may be copper-based RJ45 ports, which are cost-effective and widely used for short-distance connections within a facility. They are convenient for connecting local computers, printers, or small industrial equipment close to a network switch. Other ports may be fibre-optic interfaces, such as small pluggable (SFP) ports, multimode SC ports, or single-mode SC ports. Fibre-optic ports are suitable for long-distance transmission, high-bandwidth applications, and environments where electrical interference is an issue. In large industrial complexes with multiple buildings, fibre optic connections via this module can be used to connect different parts of the network, providing reliable and high-speed data transmission over long distances without the risk of interference from electrical equipment.

Compatibility
Switch compatibility: The module is likely to be compatible with Hirschmann’s range of Industrial Ethernet switches, especially the Greyhound series of switches, such as the Greyhound 1020/1030 switch. The modular design of Hirschmann switches makes it easy to add media modules like GMM20 – MMMMMMMMSZ9HHS999.9.99. This compatibility ensures seamless integration into existing or new network infrastructures. If a company already has a Hirschmann-based network and needs to add more network connections or change the type of connection (e.g. from copper to fibre optic), they simply plug the module into a compatible switch. This not only saves the cost of replacing an entire network system, but also provides the flexibility to customise the network to changing business needs.

Device compatibility: In addition to being compatible with switches, the module may be compatible to some extent with other industry-standard Ethernet devices. However, this will depend on the specific protocol support and electrical/physical interface standards implemented in the module. For example, if it follows a standard Ethernet protocol like IEEE 802.3, it should be able to communicate with a wide range of Ethernet-compatible devices, including certain types of industrial sensors, actuators, and other networked devices from various manufacturers. This interoperability is critical in complex industrial environments where devices from multiple vendors need to work together in a unified network.

Industrial Grade Reliability
Environmental Adaptability: Hirschmann is known for producing industrial-grade networking equipment, and the GMM20 – MMMMMMMMSZ9HHS999.9.99 is likely to be no exception. It may be designed to withstand harsh environmental conditions. This may include a wide operating temperature range, similar to other industrial modules that are capable of operating in the – 40°C to + 70°C temperature range. Such a wide temperature tolerance makes it suitable for a variety of application scenarios, including outdoor installations in extreme weather conditions, industrial plants with high-temperature machinery and equipment in operation, or cold storage facilities. In outdoor oil and gas fields, for example, the module can withstand temperature fluctuations throughout the day and night, ensuring that the network connection to the monitoring and control system remains stable.

Resistance to electrical interference: It may also have the ability to resist electrical interference, which is critical in industrial environments filled with large motors, power distribution systems and other electrical equipment that generate a lot of electromagnetic noise. By meeting electromagnetic compatibility (EMC) standards, the module is able to operate reliably in these noisy environments. This means that data transmission through the module is unaffected by electrical interference, ensuring accurate and stable communication between networked devices. In a plant with many large motors operating simultaneously, the GMM20 – MMMMMMMMSZ9HHS999.9.99 is able to maintain a stable network connection, preventing data loss or errors that might otherwise disrupt the production process.

Installation and Configuration
Installation Ease: As an interchangeable media module, it is designed to be easily installed into compatible switches. The installation process can be as simple as following the standard procedure of inserting the module into a switch slot. This simplicity reduces the time and effort required for network installation and expansion. For network technicians, they can quickly add the module to a switch without complex tools or extensive training, minimising downtime during network upgrades.
Configuration Options: Similar to other Hirschmann modules, the GMM20 – MMMMMMMMSZ9HHS999.9.99 may support a variety of configuration options. It may be configured through a web-based interface that provides a user-friendly graphical interface for network administrators to set parameters such as port speeds, VLAN (Virtual Local Area Network) assignments, and security settings.

For example, VLANs may be used to segment the network for security purposes, separating sensitive data traffic from normal network traffic. The module may also support configuration via a command line interface (CLI) to meet the needs of more experienced users who prefer a text-based approach for precise control over settings. In addition, it may be compatible with the Simple Network Management Protocol (SNMP), allowing remote monitoring and management of the module’s status and performance. This is particularly useful in large-scale network deployments where centralised management of multiple network devices is required.

1. Ethernet connectivity
   This module is most likely designed to facilitate Ethernet communications. Modules in this family typically support Fast Ethernet or Gigabit Ethernet speeds. For example, some of the modules in question can operate at 10/100/1000 Mbps, enabling high-speed data transfer between network devices. Such speed ranges make them suitable for a variety of industrial and enterprise applications where fast data exchange is critical, such as factory automation systems, data centres or large office networks.
   It may have multiple Ethernet ports. Other GMM – series modules have different port configurations, such as 8-port or 16-port setups. These ports may be a mix of copper (RJ45) and fibre optic (e.g. small pluggable SFP, multimode SC or single mode SC) interfaces. Copper ports are cost-effective for short-distance connections within a building or small area, while fibre optic ports are ideal for long-distance, high-bandwidth and interference-free transmission.
2. Compatibility
   Compatible with industrial Ethernet switches such as Hirschmann’s Greyhound 1020/1030 series. Compatibility with these switches ensures seamless integration into existing or new network infrastructures. The modular design of these switches allows for easy expansion by adding media modules such as GMM20 – MMMMMMEV9HHS9XX, enabling users to customise their network setup to their specific requirements. For example, if an existing network needs to add more fibre optic connections for a new remote sensor network, the module can be added to a suitable Hirschmann switch.
   The module also offers a degree of compatibility with other industry-standard Ethernet devices, depending on the specific protocols and electrical/physical interface standards supported by the module.
3. Industrial Grade Reliability
   Hirschmann is known for manufacturing industrial-grade networking equipment, and the GMM20 – MMMMMMEV9HHS9XX is no exception. It is designed to withstand harsh environmental conditions. This may include a wide operating temperature range, similar to other industrial modules that can operate in temperatures ranging from – 40°C to + 70°C. The GMM20 – MMMMEV9HHS9XX is designed to withstand harsh environmental conditions. This makes it suitable for use in outdoor applications, industrial plants at extreme temperatures or in areas with poor climate control.
   It can also provide protection against electrical interference, for example by complying with electromagnetic compatibility (EMC) standards. This ensures that the module operates reliably in electrically noisy environments, for example in plants with large motors, distribution systems or other electrical equipment.
4. Management and configuration
   The modules can support basic network management functions. Some similar Hirschmann modules can be configured through a web-based interface, command line interface (CLI), or Simple Network Management Protocol (SNMP). This allows network administrators to set parameters such as port speeds, VLAN (virtual LAN) assignments, and security settings. For example, VLANs can be used to segment the network for security or traffic management purposes, and the ability to configure these parameters on the module adds flexibility to the overall network design.
   The modules also support features such as link aggregation, which allows multiple physical ports to be grouped together to provide higher bandwidth and redundancy. This is useful in applications that require high availability and increased throughput, such as server-to-switch connections in data centres.
5. General safety provisions
   This equipment is powered on and in operation. Improper use may result in personal injury or property damage. Proper transport, compliant storage, installation, and careful operation and maintenance are prerequisites for safe and trouble-free operation of the equipment.
   Read this document, safety tips and warnings before connecting any cables.
   Use only undamaged parts.
   Repair parts are not included with the device. In case of malfunction or damage, disconnect the power supply and send the device to Hirschmann for inspection.

Intended use
The product is to be used only for the applications described in the Hirschmann product information and in this manual.
Use this product only within the limits specified in the technical data. See ‘Technical Data’ on page 57.
Connect this product only to components that meet the requirements of the respective application.

Installation position requirements
When installing, please observe the regulations of the country in which the equipment is to be operated.
When the ambient temperature is below -10°C, wiring suitable for the lowest temperature must be used.
For equipment models with supply voltage N (110VDC): See ‘Equipment Names and Product Codes’ on page 21. This equipment must be installed only in an operating mechanism with restricted access and accessible only to maintenance personnel. Install the device correctly to avoid mechanical shocks from the power supply area.
Hint: Risk of torsion, contact problems and gradual breakage if stress relief is not sufficient.
Reduce the effects of mechanical stress on cable and wire connection points.
Strain relief devices should be designed to prevent any mechanical damage to cables, wires or conductors from external influences or their own weight.
To prevent damage to the device connections, plug-in connectors and cables, observe the correct installation instructions in DIN VDE 0100 520:2013 – 06, sections 522.6, 522.7 and 522.13.

Enclosure
The housing may only be opened by specialists authorised by the manufacturer.
Never insert sharp objects (narrow screwdrivers, wires or similar) into the interior of the device or into the wire connection terminals. Do not touch the connection terminals.
Mount the device vertically with the antenna facing upwards.
When the ambient temperature is > + 60°C: The surface of the device chassis may be very hot. Do not touch the device during operation.

Personnel qualification requirements
Only qualified personnel should be assigned to operate the equipment. Qualified personnel should have the following characteristics:
Qualified personnel have received appropriate training. Training and practical knowledge and experience constitute personnel qualifications. This is a prerequisite for the connection, earthing and labelling of circuits, equipment or systems in accordance with current technical safety standards.
The competent person is aware of the hazards of the work.
The competent person knows the appropriate measures to deal with these hazards in order to reduce the risk to himself and others.
The competent person receives regular refresher training.
National and international safety regulations
Note whether the electrical installation complies with local or national safety regulations.
Grounding
Ground the unit through the earth wire connector on the unit itself.
Ground the unit before connecting other cables.
Disconnect all cables from ground at the end. The entire shield of the connected shielded twisted pair cable is electrically connected to the grounding wire connector on the metal housing.
Prerequisites for connecting wires
Before each connection of wires, make sure that the stated prerequisites are fulfilled.

Installation
The unit is shipped from the factory in a standby condition. To avoid contamination of the exposed contacts when the components are set aside and not installed, store all components of the system together in a dry, clean workplace. The device complies with the IP65/67 protection class only if
All connected connectors and cables are IP65/67 rated.
All unused connections and ports are sealed with the appropriate protective screws.
The protection screws supplied as accessories are IP65/67 rated.

Connecting the data cable
Follow the general recommendations below for wiring data cables in high interference environments:
Choose the shortest possible data cable.
Use fibre-optic cables for data transmission between buildings.
When wiring with copper cables, make sure that there is enough space between the power and data cables. It is best to install the cables in separate cable trenches.
Please note that power and data cables should not run in parallel over long distances. To minimise inductive coupling, ensure that the power and data cables are crossed at an angle of 90°.
For Gigabit transmission, use shielded data cables with more than copper wires, e.g. SF/UTP cables according to ISO/IEC 11801. For all transmission rates, use shielded data cables according to EN50121 – 4 and the requirements for marine applications.

Hirschmann Brand Advantages
Hirschmann has a longstanding reputation in the field of industrial networks, with a deep history and excellent technical strength. Since its establishment in 1924, Hirschmann has been making breakthroughs in technological innovations, from the early innovation of broadcasting and television transmission technology to the later pioneering of enterprise and industrial network solutions. 1984, Hirschmann successfully constructed the world’s first fibre-optic Ethernet, and in 1990, it launched the HIPER – Ring technology, which has continued to set the trend for the development of the industry. With nearly 100 years of experience, Hirschmann products occupy an important position in the global industrial market with their unrivalled reliability and high performance, and the MM20 – s 2s 2m 2 sahh managed Ethernet switch is a strong testimony to the brand’s strength.

Port Setting and Connection Characteristics
Ethernet ports: The switch is most likely to be equipped with multiple Ethernet ports and supports 10/100/1000Base-T adaptive rate function with standard RJ-45 interface. In practical application scenarios, when using standard Ethernet cables such as Cat5e, Cat6, etc., the transmission distance can reach 100 metres stably. This makes it easy to connect industrial controllers, smart sensors, computers and other Ethernet devices in industrial automation production lines, ensuring efficient and stable data transmission over short distances within the factory floor.

Fibre optic port: In view of the urgent need for long-distance, high-bandwidth data transmission in industrial environments, the MM20-s 2s 2m 2 sahh switch is most likely to be equipped with a fibre optic port. If it is a multi-mode optical fibre port, the transmission distance can reach up to 550m when 50/125μm optical fibre is used and the transmission rate is set to 1000Mbps, which is suitable for scenarios where different workshops and floors within a factory are in relatively close proximity to each other, but the data transmission rate is demanding, such as the data interaction between equipment in different production areas of an electronics manufacturing factory.

In the case of single-mode fibre ports, when 1310nm single-mode fibre is used, the transmission distance can be greatly extended to several kilometres, which is of great significance for long-distance application scenarios such as cross-factory data communication in large-scale industrial parks, or data transmission between the headquarters of a petrochemical company and a remote production base. The fibre optic port type is either SC or LC, which is easy to plug and unplug and has strong connection characteristics, fully meeting the requirements of industrial environments for both reliability and convenience of equipment connection.

Data processing and transmission performance
Fast data forwarding mechanism: The switch is equipped with a high-performance switching chip and adopts optimised forwarding algorithms to achieve extremely fast data forwarding operations. In the complex industrial automation production process, a large number of sensors generate data that need to be transmitted to the control system in real time and accurately, MM20 – s 2s 2m 2 sahh switch can forward these data to the target device in a very short time accurately and without error, which strongly guarantees the timeliness of the production data and ensures that the production line can run efficiently and stably.

VLAN Function Support: Supports Virtual Local Area Network (VLAN) technology, which can logically divide a physical network into multiple independent virtual networks. In a large enterprise network, data from different departments or business areas can be effectively segregated and managed with the help of VLAN technology. For example, dividing the production equipment network and office network into different VLANs can significantly improve network security and network management efficiency, while also effectively avoiding the negative impact of broadcast storms on network performance.

QoS Quality of Service Assurance System: It is equipped with perfect QoS (Quality of Service) function, which can differentiate data according to its type and priority. In the field of industrial automation, for control data with extremely high real-time requirements, a higher priority can be set to ensure that such data can still be transmitted with priority when the network is congested, thus avoiding production accidents caused by network delays. For non-critical monitoring data, a lower priority can be set to achieve a reasonable allocation of network bandwidth resources.

Network Management Function Module
Diversified Management Modes: As a managed Ethernet switch, MM20-s 2s 2m 2 sahh supports rich and diversified management modes. Professional network engineers can perform fine configuration through the command line interface (CLI) to meet the needs of complex network settings; Telnet can also be used for remote management, which is convenient for configuring and monitoring the switch in remote environments. In addition, it also provides Web-based management, which enables even non-professionals to easily perform basic configuration operations, such as setting port parameters and viewing real-time network status, through an intuitive graphical interface.

Port Monitoring and Statistical Analysis: Each port can be monitored in real time, including the connection status of the port, data traffic, the number of error frames and other key information. With the help of these real-time monitoring data, network administrators can detect network failures or abnormal traffic conditions, such as sudden interruption of port connection, abnormal increase of data traffic, etc., and quickly take corresponding measures. In addition, the switch can also perform comprehensive statistical analysis of port data, such as the average traffic volume and peak traffic volume over a period of time, providing valuable data for network optimisation and expansion.

Security Management Mechanism: Supporting Access Control Lists (ACLs), the switch can strictly restrict network access based on various conditions such as source IP address, destination IP address, port number, and so on. For example, in an industrial network, only devices with specific IP address segments are allowed to access the production network, effectively preventing unauthorised devices from accessing the network and effectively safeguarding the security of the industrial network. At the same time, 802.1X authentication may be supported to ensure that the identity of devices accessing the network is legal and compliant through a rigorous authentication mechanism, further enhancing the overall security of the network.

Reliability and Environmental Adaptability
Redundant design guarantee: Some models may adopt redundant power supply design, equipped with two or more power input interfaces. When one of the power supply fails, the other power supply can quickly and automatically take over the work to ensure the continuous and stable operation of the switch, effectively avoiding network interruptions caused by power failure. In terms of network connection, it supports link redundancy function, which transmits data through multiple network links. Once a link fails, the data can be automatically switched to other normal links in a very short time to ensure the continuity and stability of network communication. This feature is especially suitable for industrial application scenarios that require high network reliability, such as electric power system monitoring network and medical equipment remote control network.

Industrial-grade standard: Strictly following the industrial-grade standard for design and manufacturing, it can adapt to all kinds of harsh industrial environments. The internal electronic components have been carefully screened, with excellent resistance to high and low temperatures, humidity, dust and other characteristics, the shell design can be effectively dustproof, waterproof, the internal structure can withstand a certain degree of vibration and shock. Whether in the hot smelting workshop of a steel factory, the dusty and humid working environment of a coal mine, or the complex and changeable climatic conditions of an outdoor power substation, the MM20 – s 2s 2m 2 sahh switches can operate stably and reliably, ensuring that the industrial network is always unimpeded.

Brand strength endorsement
Hirschmann, as a leading brand in the field of industrial networks, has been established since 1924, after nearly a hundred years of technical precipitation and market cultivation. Hirschmann has achieved outstanding results in the fields of broadcasting and television transmission technology, enterprise and industrial network solutions. In 1984, Hirschmann built the world’s first fibre-optic Ethernet, and in 1990, it launched HIPER – Ring, which has established its position at the forefront of industrial network technology.

With deep technical accumulation and rich experience, its products are known for high reliability and excellent performance, which can operate stably in extreme industrial environments such as high temperature, high pressure and strong electromagnetic interference, and its business covers the whole world, which provides a solid brand guarantee for MM20 – m2 m2 t1 sahh managed Ethernet switch.

Port Configuration and Connectivity
Ethernet Ports: The switch will most likely be equipped with Ethernet ports that support 10/100/1000Base-T adaptive rates, using standard RJ-45 interfaces. This design enables a transmission distance of up to 100 metres when using standard Cat5e, Cat6 or higher Ethernet cables, which can easily and seamlessly connect with industrial controllers, smart sensors, computers and other types of Ethernet devices, ensuring stable and reliable short-distance data transmission in the industrial field to meet the needs of data interaction between devices on the factory floor.

Optical Fibre Port: Considering the demand for long distance and high bandwidth transmission in industrial scenarios, it is likely to be equipped with an optical fibre port. If it is a multi-mode optical fibre port, the transmission distance is estimated to be up to 550m when 50/125μm optical fibre is used and the transmission rate is 1000Mbps, which is suitable for scenarios where different workshops and floors within the factory are in relatively close proximity to each other, but have higher requirements for the data transmission rate, such as the data communication between the equipment of the stamping workshop and the welding workshop of the automobile manufacturing factory.

When equipped with single-mode fibre ports, the transmission distance can be greatly extended to several kilometres when using single-mode fibre at 1310nm wavelength, which is significant for data communication across plants in large industrial parks, or for long-distance data transmission between substations and remote monitoring centres in smart grids. Fibre optic ports may be of the common SC, LC type, with easy plugging and unplugging, solid connection characteristics, in line with the requirements of industrial environments on the stability and convenience of equipment connection.

Data processing and transmission performance
High-performance data forwarding: High-performance switching chips and optimised forwarding algorithms are used internally to achieve fast data forwarding. In industrial automation production lines, a large amount of sensor data needs to be transmitted to the control system in real time, MM20 – m2 m2 t1 sahh can accurately forward the data to the target device in a very short time, to ensure the timeliness of the production data, to ensure the efficient operation of the production line.

VLAN Support: Supports Virtual Local Area Network (VLAN) technology, which can divide a physical network into multiple logically independent virtual networks. In the enterprise network, the data of different departments or business areas can be isolated and managed through VLANs, for example, dividing the production equipment network and office network into different VLANs, which improves network security and management efficiency while avoiding the impact of broadcast storms on network performance.

QoS (Quality of Service): With QoS (Quality of Service) function, it can differentiate the processing according to the type and priority of data. For control data in industrial automation with high real-time requirements, a higher priority can be set to ensure that it is transmitted first when the network is congested, so as to avoid production accidents caused by network delays, while for non-critical monitoring data and so on, a lower priority can be set to reasonably allocate network bandwidth resources.

Network Management Functions
Multiple management methods: As a managed Ethernet switch, it supports rich management methods. It can be configured via command line interface (CLI), which is suitable for professional network engineers to set complex parameters; it also supports Telnet remote management, which is convenient to configure and monitor the switch remotely. At the same time, it provides web interface management, with intuitive graphical interface, allowing non-professionals to easily perform basic configuration operations, such as setting port parameters, checking network status, and so on.

Port monitoring and statistics: It can monitor the status of each port in real time, including the connection status of the port, data traffic, number of error frames and other information. Through these real-time monitoring data, network administrators can timely detect network failures or abnormal traffic, such as port connection interruption, data traffic abnormally increased, etc., and handle the situation accordingly. In addition, the port data can be statistically analysed, such as the average flow rate and peak flow rate over a period of time, providing data basis for network optimization and expansion.

Security Management: Support Access Control List (ACL), which can restrict network access according to source IP address, destination IP address, port number and other conditions. For example, only devices with specific IP address segments are allowed to access the production network, preventing unauthorised devices from accessing and safeguarding the security of the industrial network. At the same time, it may support 802.1X authentication to ensure that the identity of devices accessing the network is legitimate through the authentication mechanism, further enhancing network security.
V. Reliability and Environmental Adaptability

Redundant design: Some models may adopt redundant power supply design, equipped with two or more power input interfaces, so that when one power supply fails, the other power supply can automatically take over the work to ensure the continuous operation of the switch and avoid network interruption due to power failure. In terms of network connection, it supports link redundancy function, which transmits data through multiple network links, and when one link fails, the data can be automatically and quickly switched to other normal links to ensure uninterrupted network communication, which is suitable for industrial application scenarios that require high network reliability, such as electric power system monitoring network, chemical production control system, and so on.

Industrial-grade design: Strictly designed and manufactured in accordance with industrial-grade standards, it can adapt to harsh industrial environments. The internal electronic components have been strictly screened and have the characteristics of high temperature resistance, low temperature resistance, humidity resistance, dust resistance, etc. The shell design can effectively prevent dust and water, and the internal structure can resist a certain degree of vibration and impact. For example, it can operate stably in the high temperature smelting workshop of steel factory, dusty and humid environment of coal mine, outdoor power substation and other harsh places to ensure the reliable connection of industrial network.

Product Overview: MICE MS20/MS30 series switches are modular industrial Ethernet switches designed for industrial automation, meeting relevant industry standards with high reliability and flexibility. They can be customised according to the number of ports, transmission speed, temperature range and other criteria, and support a variety of installation and management methods to build IEEE 802.3-compliant switched industrial Ethernet networks.

Product Details
Models and Codes: Product codes contain information about device characteristics, such as MS20 for modular switches without Gigabit ports and MS30 for modular switches with Gigabit ports, which can be used to identify specific device attributes.
Device variants: The MS20 series has 8, 16, and 24 10/100 Mbit/s Ethernet ports; the MS30 series has 2 Gigabit ports in addition to the 10/100 Mbit/s Ethernet ports. The port media type can be selected via a media module.

Media Modules: Various types of media modules provide different interfaces and functions, such as the MM2 and MM3 series modules, as well as the MM22 – T1T1T1T1 module with PoE support and the MB20 module for extended functions.
Port functions: Ethernet ports include 10/100/1000 Mbit/s twisted pair ports, 10/100 Mbit/s twisted pair ports, 10/100 Mbit/s PoE ports, 1000 Mbit/s F/O ports, and 100 Mbit/s F/O ports, which support different standards and functions; AUI ports can be connected to specific devices with their corresponding functions and default settings. The AUI ports can be connected to specific devices with their corresponding functions and default settings.

Display Components: Device status, display status, and port status are indicated by different LEDs, reflecting various information such as device operation, port connection, and so on.
Installation Guide: The installation process covers checking the package, installing the media module, setting the DIP switches, connecting the power and signal contacts, mounting the device to the DIN rail and grounding it, and connecting the data cables, with detailed instructions and precautions for each step.

Basic Settings: The first installation requires IP parameters to be set, which can be configured through the V.24 interface, BOOTP, DHCP, etc. The default settings include the IP address acquisition method. The default settings include IP address acquisition method, management password, etc. It is recommended to change the default password when logging in for the first time to enhance security.

Working Principle
Signal Conversion Principle: This media converter can convert different types of network signals to achieve interconnection between devices. In industrial environments, the conversion of common Ethernet signals and optical fibre signals is an important function. In a factory automation line, for example, where the sensor devices at the front end may transmit data via optical fibre and the control system at the back end uses Ethernet for data processing, the MM20 – M2M2M2TAHH media converter precisely converts optical signals transmitted via optical fibre into electrical signals over Ethernet and vice versa, guaranteeing smooth data transmission between the different media.

The signal conversion process is based on a specific chip and circuit design. The internal converter chip is able to analyse and process the incoming signals and convert them to the target signal format according to the appropriate protocols and standards, ensuring accuracy and stability during the conversion process.

Port Interaction Principle: There are various types of ports, and different ports have their own functions and collaborate with each other to achieve data transmission. The Ethernet port supports 10/100/1000Base-T adaptive rate, which can automatically recognise the Ethernet transmission rate of the device connected to it and adapt to it. When connecting devices with different rates, such as 100Mbps old devices and 1000Mbps new devices, the port can automatically adjust the rate to ensure the compatibility of data transmission. Fibre optic ports enable long distance, high speed data transmission depending on the type of fibre (multimode or singlemode) and wavelength.

Multimode fibre ports can transmit up to 550m at 1000Mbps under 50/125μm specification, which is suitable for data interaction between equipment in different workshops within a factory; single-mode fibre ports can extend the transmission distance to several kilometres at 1310nm wavelength, which meets the needs of cross-factory data communication in large-scale industrial parks. Data interaction between ports follows the relevant Ethernet protocols and fibre optic transmission standards, ensuring accurate and fast data transmission between ports.

Network Adaptation Principle: In complex industrial network environments, the MM20 – M2M2M2TAHH media converter is equipped with powerful network adaptation capabilities. It supports a wide range of industrial Ethernet protocols, such as Modbus TCP, PROFINET, EtherNet/IP, and so on.

This allows different brands and types of industrial automation equipment to communicate and interact with each other via the media converter, even if they use different protocols. In an industrial automation production line containing multiple brands of controllers and sensors, the media converter can convert and transmit the data of devices using Modbus TCP protocol to achieve interoperability and co-operation of the entire production line. In addition, it can adapt to different network topologies, whether it is a bus, star or ring network, can work stably, to ensure the reliability and stability of industrial networks.

Brand foundation: Hirschmann’s deep heritage
Since its foundation in 1924, Hirschmann has gradually transformed itself from a one-man company into a global leader in the field of communications. In the field of broadcasting and television transmission technology, its mobile transmitter and receiver systems support the stable propagation of signals; in enterprise and industrial network solutions and fieldbus systems, Hirschmann’s pioneering achievements include the world’s first fibre-optic Ethernet in 1984 and the introduction of HIPER-Ring (redundant ring) Ethernet in 1990. These pioneering achievements underline Hirschmann’s deep technical know-how and excellent market reputation in industrial networks and related fields.

With rich experience and expertise, Hussmann’s products are able to maintain high transmission speed and reliability in harsh industrial environments such as high temperature, high pressure, and strong electromagnetic interference. Hussmann has a global presence, with production plants in Germany and Hungary, and branches in Europe, the United States, and Asia, ready to respond to the needs of customers around the world.

Port and Connection Characteristics
Ethernet Port: Based on similar Hussmann products, the MM20 – m2 m2 m2 eahh media converter is likely to be equipped with an Ethernet port that supports 10/100/1000Base-T adaptive rates, using an RJ-45 interface. This design facilitates connection using standard Cat5e, Cat6 or higher Ethernet cables, and ideally, the Ethernet port can effectively transmit data over distances of up to 100 metres using standard-compliant cables. This makes it easy to seamlessly connect with industrial controllers, smart sensors, computers and other Ethernet devices, ensuring the stability and reliability of short-distance data transmission in industrial sites.

Fibre optic port: Considering the demand for long distance and high bandwidth transmission in industrial scenarios, the media converter is likely to be equipped with a fibre optic port. If the media converter is equipped with a multi-mode optical fibre port, the transmission distance is estimated to be up to 550m when using 50/125μm optical fibre with a transmission rate of 1000Mbps, which is suitable for scenarios such as different workshops and floors within a factory that are relatively close to each other but with higher requirements on data transmission rate, for example, data interactions between equipments in different production areas of an automobile manufacturing factory.

When equipped with single-mode fibre ports, the transmission distance can be significantly extended to several kilometres when using single-mode fibre at 1310nm wavelength, which is important for cross-factory data communication in large industrial parks or long-distance data transmission scenarios such as transformer substations and remote monitoring centres in smart grids. Fiber optic port types may be common SC, LC type, with easy plugging and unplugging, solid connection characteristics, to meet the requirements of industrial environments on the stability and convenience of equipment connection.

Data conversion performance
Accurate signal conversion: In industrial automation production lines, front-end sensors often use optical fibre to build high-speed data acquisition networks, while back-end control systems are often based on Ethernet architecture. one of the core functions of the MM20 – m2 m2 m2 m2 eahh media converter is to accurately convert optical signals transmitted by optical fibre into electrical signals that can be recognised by Ethernet, and vice versa.

In an electronics manufacturing plant, for example, high-precision sensors on the production line used to check the quality of the product transmit the test data over the optical fibre to the media converter, which quickly converts it into Ethernet signals and transmits them to the production management system at the back end, providing timely and accurate data for production decision-making, and guaranteeing efficient and stable operation of the production line.

Intelligent Rate Adaptation: In a complex industrial network environment, the data transmission rate of different devices varies greatly. New devices may have a transmission rate of 1000Mbps or even higher, while some old devices still maintain a rate of 100Mbps. MM20 – m2 m2 m2 m2 eahh is equipped with a rate adaptation function, which can automatically sense the transmission rate of the devices connected to it and carry out intelligent matching and coordination.

In the enterprise network upgrading and transformation, through the media converter, these devices with different rates can work together in the same network, avoiding data transmission delays, packet loss or even interruptions due to rate mismatch, which greatly improves the stability and compatibility of network data transmission and ensures that all kinds of data can be transmitted smoothly in the process of industrial production.

Network Expansion and Security
Breakthrough transmission distance limitation: traditional Ethernet twisted pair transmission distance is limited, it is difficult to meet the demand for long-distance data transmission in large-scale industrial facilities with widely distributed equipment. mm20 – m2 m2 m2 m2 eahh media converter effectively solves this problem with the advantages of fibre optic transmission in terms of distance and anti-interference. In large industrial plants such as steel and cement factories, the plant area is vast and the equipment is extremely dispersed.

By using the media converter with optical fibre, data can be transmitted up to several kilometres away, significantly extending the network coverage. For example, in a steel plant, between the equipment located in the high-temperature smelting area and the central monitoring room located at the far end of the plant, through the media converter and optical fibre, it is possible to stably transmit the data on the operating status of the equipment, process parameters and other data to the monitoring room, so as to facilitate the operators to grasp the production situation in real time, to make decisions in a timely manner, and to safeguard the safety and stability of the production process.

Strengthen network security protection: In the signal conversion at the same time, MM20 – m2 m2 m2 m2 eahh also has a network isolation function, which is of great significance to improve the security of industrial networks. It can effectively block the flow of unnecessary network traffic between different network areas, reducing the scope of potential network attacks on the entire network system threat. In substations in the power industry, networks in different functional areas, such as the primary equipment monitoring network and the secondary equipment protection network, are segregated by this media converter.

Even if the network in a certain region suffers from malicious attacks, the attack can be prevented from spreading to other regions to the maximum extent possible, safeguarding the stable operation of the power system network and ensuring the reliability of power supply. In addition, some of the media converters may also have a simple protocol conversion function, so that the use of different communication protocols network equipment can achieve interoperability, further enhancing the overall security and adaptability of the network.