The data sub-rate multiplexer in integrated access equipment can make multi-channels of low data rate multiplexing into one channel of 64 kbit/s signal directly and it is a convenient and flexible low data rate interface board which has widespread application in telecommunications for electric power system.

The subject is mainly accomplish a digital multiplexer by FPGA.

An all-purpose multiplex system for the optical wireless multiple-service communication is designed to enhance effectively the flexibility of the optical wireless communication.

Its global design and pivotal part are introduced including the improvement of Ping-pong structure,data multiplex and the realization of control logic,etc.

As communications traffic increasing, digital multiplex technology is introduced to meet with improving transmission efficiency and magnifying transmission capacity, and now it forms universal standards and systems.

Then it describes the principle of synchronization and multiplexing in digital communication .

On the importance of the repetitive ground in the civil building;

The house repetitive ground s setting and maintenance;