NM: network module Network Module
1FE: 1 FE interface, fast ethernet interface
TX: It means it is an ordinary electrical port, that is, the kind of network port of rj45
Plugging in the module is equivalent to adding a FE interface to the router. Interface
FE: Fast Ethernet and the original work in the 100Mbps bandwidth FDDI compared to it has many advantages, the most important reflected in the Fast Ethernet technology can effectively protect the user in the wiring infrastructure implementation of the investment, which supports Category 3, 4, 5 twisted-pair cable as well as fiber optic connections, can effectively use the existing facilities.
100Mbps Fast Ethernet standard is divided into: 100BASE-TX, 100BASE-FX, 100BASE-T4 three sub-categories.
100BASE-TX is a Fast Ethernet technology that uses Category 5 data-grade unshielded twisted pair or shielded twisted pair. It uses two pairs of twisted pairs, one pair for transmitting and one pair for receiving data. It uses 4B/5B encoding for transmission at 125 MHz and complies with the EIA586 Category 5 cabling standard and IBM's SPT Category 1 cabling standard. It uses the same RJ-45 connector as 10BASE-T. Its maximum segment length is 100 meters. It supports full-duplex data transmission.
100BASE-FX is a Fast Ethernet technology that uses fiber optic cables and is available in single-mode and multimode fiber (62.5 and 125um) The maximum distance for multimode fiber connections is 550 meters. The maximum distance for single-mode fiber connections is 3000 meters. It uses 4B/5B coding method in transmission with a signal frequency of 125 MHz. it uses MIC/FDDI connectors, ST connectors or SC connectors. It has a maximum segment length of 150m, 412m, 2000m or longer up to 10km, depending on the type of fiber used and the mode of operation, and it supports full-duplex data transmission. 100BASE-FX is particularly suitable for application in environments where there are electrical interferences, for connections over larger distances, or for high-security environments.
100BASE-T4 is a Fast Ethernet technology that can use Category 3, 4, or 5 unshielded twisted pair or shielded twisted pair. It uses 4 twisted pairs, 3 pairs for transmitting data and 1 pair for detecting conflicting signals. It uses 8B/6T encoding in transmission with a signal frequency of 25 MHz and complies with the EIA586 structured cabling standard. It uses the same RJ-45 connector as 10BASE-T and has a maximum segment length of 100 meters.