Method and means for transmitting low speed signals over a PCM framing code
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United States of America Patent
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-
Jan 6, 1981
Grant Date -
N/A
app pub date -
May 23, 1979
filing date -
May 23, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The standard D3 signalling frame bit pattern of a T1-type PCM telephone system is modified to provide a pattern in which (4n-3) separate low-speed data channels can be transmitted in a superframe consisting of 12n frames of the PCN carrier (n being a positive integer), without requiring a separate synchronization detector for superframe synchronization. Simple self-synchronizing circuit means are further disclosed for multiplexing a large number of essentially steady-state signals onto the low-speed data channels, and for positively detecting the onset and cessation of each steady-state signal, independently of the onset and cessation of any other steady-state signal, once in each group of k superframes, where k-1 is the number of steady-state signals being multiplexed.
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