1. Optical transceiver

The optical transceiver can transmit video signal, 485 control signal, network signal, alarm signal, audio signal, switch quantity, etc. The optical transceiver on monitoring is generally: one end of the optical transmitter is connected to the camera, the other end is connected to the optical fiber, one end of the optical receiver is connected to the optical fiber, and the other end is connected to the display device.

There are two kinds of optical transceivers

1. PDH optical transceiver is used to transmit data signals.

2. Video optical transceivers are used to transmit video monitoring signals. This optical transceiver needs to be divided into receivers and transmitters. The main function of the receiver, that is, the video receiver, is to convert optical signals into electrical signals (D/A). The main function of the transmitter, that is, the video transmitter, is to convert electrical signals into optical signals (A/D).

2. Optical fiber transceiver

As mentioned earlier, the optical transceiver is used to transmit video signals. Then the optical fiber transceiver is used to transmit Ethernet signals. Although they are all photoelectric conversions, the protocols and principles of electrical signals are different, and the signals transmitted on the optical path are also different.

One end of the fiber optic transceiver is connected to the optical transmission system, and the other end (user end) is a 10/100M Ethernet interface. Optical fiber transceivers all realize the conversion of photoelectric signals. The main principle of the fiber optic transceiver is realized by photoelectric coupling.

Optical fiber transceivers are mainly used in the network, one end is connected to the optical fiber, and the other end is connected to the switch, mainly for network signals.