digital zeitmultiplexsystem.

摘要

A time division multiplex system adaptable for branching services, which includes a predetermined level code generator for generating a signal of the same level and a switching unit for switching between the predetermined level signal and a signal to be multiplexed. The channel bit group number allotted to each channel is changed with time. For signals of transmission speeds above 64 Kb/s, a plurality of time slots are used to form a single channel to thereby accommodate branching services in octet units.