H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/1
H04J 3/12 (2006.01) H04J 3/07 (2006.01) H04J 3/06 (2006.01)
Patent
CA 1055171
A DIGITAL TIME-DIVISION MULTIPLEXING SYSTEM by Alvin L. Pachynski, Jr. ABSTRACT OF THE DISCLOSURE A time-division multiplexing system wherein N parallel digital signals having an average bit rate of f1 are interleaved by a multiplexer to form a single composite line signal of bit rate f2, where f2 > Nf1. 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 f2/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 f1. Each digital signal with the added gaps is then interleaved to form the composite line signal having the desired bit rate of f2. 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. - 1 -
253168
Gte Automatic Electric Laboratories Incorporated
Na
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