Patent
1975-05-30
1976-11-30
Stewart, David L.
179 15BS, H04J 306
Patent
active
039951200
ABSTRACT:
A time-division multiplexing system wherein N parallel digital signals having an average bit rate of f.sub.1 are interleaved by a multiplexer to form a single composite line signal of bit rate f.sub.2, where f.sub.2 > NF.sub.1. Prior to multiplexing, signal gaps having a predetermined duration and having a fixed repetition rate are inserted into each of the N parallel signals. Adding gaps to each digital signal permits the bit rate between gaps to be increased to f.sub.2 /N, a submultiple of the composite line signal bit rate. The gap duration and their occurrence is such so as to maintain the average bit rate of each digital signal at f.sub.1. Each digital signal with the added gaps is then interleaved to form the composite line signal having the desired bit rate of f.sub.2. The interleaved gaps form empty time slots in the composite signal into which one or more signaling bits are added. Some of the added signaling bits carry framing information to enable the multiplexer and demultiplexer to maintain synchronism during signal transmission. Thus, a composite higher-rate digital line signal, consisting of interleaved information bits and signaling bits, forms the time-division multiplex signal suitable for transmission over a single digital transmission path. The N parallel digital signals are recovered at the demultiplexer by sequentially selecting each information bit associated with a particular digital signal.
REFERENCES:
patent: 3564414 (1971-02-01), Ebert
Cool Leonard R.
Gilbert Douglas M.
GTE Automatic Electric Laboratories Incorporated
Stewart David L.
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