PDH optical transceiver (Plesiochronous Digital Hierarchy), a quasi-synchronous digital transmission series system. PDH optical transceivers are small-capacity optical transceivers. PDH optical transceivers are generally used in pairs, also called point-to-point applications. The capacity is generally 4E1, 8E1, 16E1.

PDH optical transceiver function: PDH optical transceiver is suitable for small-capacity switch networking, user loop network, mobile communication (base station), private network, DDN network, etc.

Features of PDH optical transceiver:
It adopts super large-scale integrated chip, which has the characteristics of low power consumption and high reliability. Provide E1 remote loopback test function, easy to maintain. Provides 4 E1 channels; has a complete alarm function, which can display local and remote alarms. Alarm information (including power failure alarm) can be reported to the peer through the network management channel. Using transceiver integrated optical devices, stable and reliable working performance. The single-board design of the whole machine is small in size and easy to use.

Four advantages of PDH optical transceiver:
1. A unified interface standard and a unified bit rate provide the possibility of interconnection between devices from different manufacturers.
2. The ability in network management has been greatly improved.
3. Theoretically, a new concept of self-healing network is proposed. When the main signal of the transmission media is cut off, it will automatically resume normal communication through the self-healing network. v
4. Byte multiplexing technology is adopted to make the upper and lower branch signals in the network very simple.

Because PDH has the above-mentioned remarkable advantages, it will become one of the basic technologies to realize the information superhighway. But on the branch roads and fork roads connected with the information highway, PDH optical transceiver equipment will still be useful.

PDH optical transceiver mainly completes E1 and Ethernet business access, and realizes the point-to-point communication function of E1 signal and Ethernet signal by multiplexing to 1 optical signal transmission. Occupy less space, flexible configuration, dual power supply protection.