Brand Background
Hirschmann has a longstanding reputation in the field of network communications, having built the world’s first fibre-optic Ethernet in 1984 at the University of Stuttgart, Germany, and pioneered HIPER – Ring technology in 1990. Its products are used in both industrial and office environments and cover a wide range of applications from Gigabit Ethernet and Fast Ethernet to fieldbus systems and ASI connectors for actuators and sensors. In industrial automation, process control, traffic control and office communication scenarios, Hirschmann products have become the trusted choice of many companies due to their outstanding reliability and stability, providing solid support for the construction of efficient and stable network communication systems.
Second, the specification parameters (because we have not found the precise parameters, the following is a similar module speculation)

Port type and number: Referring to the same series of products, it may be equipped with various types of ports, such as 10/100Base – TX electrical port, which is used for connecting traditional Ethernet cables to meet the needs of short-distance equipment access; or 100Base – FX multi-mode SC port, which is suitable for short and medium distances, higher bandwidth requirements and the need for anti-interference fibre optic connectivity scenarios. The number of ports may be set to more than one according to the scale and complexity of the actual application scenarios to achieve efficient

interconnection between multiple devices.
Transmission rate: It is likely to support Fast Ethernet standard, i.e., 100Mbps transmission rate, to guarantee the fast transmission of data in the network and to meet the business needs of general industrial control and office network with small data volume but high real-time requirements. For some application scenarios with higher requirements for data transmission, it is not excluded that it has the ability to work with other high-speed modules to achieve higher bandwidth.

Performance characteristics
High reliability: Based on Hirschmann’s mature industrial-grade design concept, the module can adapt to the harsh working environment. With excellent anti-electromagnetic interference capability, it can effectively avoid data loss or incorrect transmission due to signal interference in strong electromagnetic environments, such as industrial production workshops, ensuring stable and reliable data communication. At the same time, it can also maintain normal operation under complex conditions such as mechanical vibration and temperature changes, reducing equipment failures caused by environmental factors.
Efficient Data Processing: Advanced data processing chips and algorithms are used internally, which can quickly debug and demodulate Ethernet transmission signals, and accurately convert differential signals on the network line into digital signals recognisable by the CPU. When the data traffic is large, the optimised caching mechanism and data forwarding strategy can also guarantee the high efficiency of data processing, reduce the transmission delay and improve the overall network performance.

Model supplement
In the Hirschmann Ethernet module product line, the GMM 20 series is also available in many different configurations. For example, some models may have different port combinations, some focus on more electrical port configurations, which are suitable for networks with traditional cable-connected devices, while others increase the number of optical ports to meet the needs of long-distance, high-speed optical communication. There are also models that expand on functional features, such as support for specific network protocols, in order to adapt to the special requirements of specific industries or application scenarios. These different models together constitute a rich product matrix to meet the diverse needs of network construction.

Scenario Applications
Industrial automation production: In automated production lines, the module can connect various types of sensors, controllers, actuators and other equipment. The data collected by the sensor is quickly transmitted to the controller for analysis and processing, and the controller sends commands to the actuator through the module according to the analysis results to achieve accurate control of the production process. For example, in automobile manufacturing factories, this module ensures efficient communication between various production line equipment to improve production efficiency and product quality.

Intelligent traffic monitoring: Used in traffic signal light control system, the module can transmit real-time signal light status data to the traffic management centre, and at the same time receive control instructions from the centre to adjust the signal light timing. In the highway monitoring system, the video data collected by the camera can be quickly transmitted to the monitoring centre to provide a basis for traffic management decisions and ensure road traffic safety and smooth flow.
Enterprise office network: In the enterprise office environment, office computers, printers, servers and other equipment can be connected to build a stable internal local area network. Employees can quickly access shared files and use network printers, and the server can efficiently provide data services for each terminal device to enhance the efficiency of corporate office and information technology.

Precautions
Installation environment: Avoid installation in high temperature, humidity or strong corrosive environment. High temperatures may lead to a decline in the performance of the module’s internal electronic components, shortening the service life; humid environments are prone to cause circuit short-circuit failures; strong corrosive gases or liquids may erode the module shell and internal circuits, damaging the equipment. It is recommended to install the module in a well-ventilated environment with suitable temperature (generally 0 – 50℃) and moderate relative humidity.

Connection Adaptation: Ensure that the specification of the connected cable matches the module port. Using cables that do not meet the specifications may result in severe signal degradation, reduced transmission rates, or even failure to communicate. For example, when connecting a 100Base-FX optical port, use a fibre optic cable of the corresponding specification, and make sure that the type of fibre optic (singlemode or multimode) is compatible with the module. At the same time, when connecting the electrical port, choose an Ethernet cable that meets the standard, and ensure that the cable is of good quality, with no damage or breakage.

Network Configuration: Before connecting to the network, it is necessary to correctly configure the network. According to the IP address planning of the network, set the IP address, subnet mask, gateway and other parameters of the module. Incorrect network configuration will result in the module not being able to communicate normally with other devices. If it involves complex network environment, such as the existence of VLAN delineation, routing settings, etc., it requires professional personnel to carry out fine configuration to ensure the stable operation of the module in the network and accurate data transmission.