Principles and Application Scenarios of PDH Optical Terminal Equipment

The principle of different types of optical terminal equipment is the same. An optical terminal consists of a transmitter and a receiver. The transmitter processes the analog signals from the user end through amplification, A/D conversion, and multiplexing, and finally converts the electrical signals into optical signals via electrical/optical conversion for transmission over optical fibers to the receiver.

At the receiver, the opposite process occurs. First, the received optical signals are converted back into electrical signals through optical/electrical conversion. The electrical signals are then demultiplexed and sent to the client end via D/A conversion and amplification filtering.

PDH Optical Terminal Application

PDH optical terminals use large-scale integrated chips, featuring low power consumption and high reliability. They provide remote loopback testing for E1 channels, making maintenance convenient.

The IDM-120N provides 4 E1 channels; it has comprehensive alarm functions that can display both local and remote alarms. Alarm information (including power failure alarms) can be reported to the opposite end through the network management channel. It uses integrated optical transceiver components, ensuring stable and reliable operation. The entire unit is designed as a single board, making it compact and easy to use. It is suitable for small-capacity switch networks, user loop networks, information superhighways, mobile communications (base stations), dedicated networks, and DDN networks.