Optical modem, also known as single-port optical transceiver, is a product designed for special user environments. It uses a pair of optical fibers to perform single E1 or single V.35 or single 10BaseT point-to-point optical transmission terminal equipment. As the relay transmission equipment of the local network, the equipment is suitable for the optical fiber terminal transmission equipment of the base station and the leased line equipment. For multi-port optical transceivers, they are generally called “optical transceivers”. For single-port optical transceivers, they are generally used at the user end, and work similar to the commonly used baseband MODEM for WAN dedicated line (circuit) networking. Optical Modem”.
What are the classification and application scope of light cats?
Light cat classification:
There are E1 optical modems, Ethernet optical modems, and V35 optical transceivers, which are configured with corresponding service interfaces according to customer needs. E1 optical modems transmit E1 signals through optical fibers, and Ethernet optical modems transmit 2M Ethernet signals through optical fibers. V35 The optical cat transmits the V35 signal through the optical fiber.
The scope of application of light cat:
Speaking of the Ethernet optical cat, it is mainly used in the case where the distance exceeds 20KM, and the intermediate needs to be transferred through optical transmission equipment such as SDH/PDH. Generally speaking, the rate of the optical cat is packaged on the 2M circuit, so the difference between the optical transceiver of the optical cat is also its rate, the optical cat is 2M, and the optical transceiver is 100M.
General application scenarios:
Client-Ethernet optical cat-optical cable-E1 optical cat-2M cable-central office SDH optical transceiver-another office SDH optical transceiver-PDH optical transceiver-E1 to Ethernet protocol conversion-customer equipment (Ethernet switch or computer, etc.). Of course, there are also V.35 light cats, V.24 light cats, RS-232 light cats and so on.
Summary: The optical cat is a device similar to the baseband MODEM (digital modem). Unlike the baseband MODEM, the access is an optical fiber dedicated line, which is an optical signal. The router is connected to the router after the conversion of the photoelectric signal and the conversion of the interface protocol. It belongs to a type of WAN access, which is often referred to as the optical fiber access. As long as there is optical fiber, the optical cat needs to convert the optical signal.