What is a light cat? How to set up a telecommunications light cat
2021-05-17
A light cat is an "optical modem", which refers to a transceiver device that converts a light Ethernet signal into other protocol signals, and also functions as a modem. The optical cat is also called a single-port optical transceiver. The device acts as a relay transmission device for the local network, and is suitable for the optical fiber terminal transmission equipment of the base station and the leased line equipment. For a multi-port optical transceiver, it is generally called "optical transceiver". For a single-port optical transceiver, it is generally used at the user end. It works like a common baseband MODEM for WAN dedicated line (circuit) networking, and has a name called "light MODEM" and " Light cat", "optical modem". 
Light cat's working principle Light cat's equipment uses large-scale integrated chip, simple circuit, low power consumption, high reliability, complete alarm status indication and perfect network management function.
The light cat is a device similar to the baseband MODEM (digital modem). Unlike the baseband MODEM, it is connected to the fiber-optic line and is an optical signal. It is used for the conversion of photoelectric signals and the conversion of interface protocols in the WAN. The access router is a wide area network access. The optoelectronic transceiver is the conversion of the photoelectric signal in the local area network, but only the signal conversion, without the conversion of the interface protocol. 
The application range of the light cat is only Ethernet light cat, which is mainly used for distance super, more than 20KM, and the light cat is applied in the middle of the optical transmission equipment such as SDH/PDH.
Generally speaking, the speed of the optical cat is packaged on the 2M circuit, so the optical transceiver of the optical cat is also different in its speed, the optical cat is 2M, and the optical transceiver is 100M.
General application scenario:
Customer - Ethernet Light Cat - Optical Cable - E1 Optical Cat - 2M Cable - Centralized SDH Optical Transceiver - Another Office SDH Optical Transceiver - PDH Optical Transceiver - E1 to Ethernet Co-Transfer - Customer Equipment (Ethernet Switch or Computer, etc.).
Of course, the light cat also has V.35 light cat, V.24 light cat, RS-232 light cat and so on. The application is similar to the above.
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