Method and means for transmitting low speed signals over a PCM f

Details Method and means for transmitting low speed signals over a PCM f Method and means for transmitting low speed signals over a PCM f

1979-05-23

1981-01-06

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

H04J 114

Patent

active

042439302

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.

REFERENCES:
patent: 3840705 (1974-10-01), Hackett
patent: 3873776 (1975-03-01), Smith
patent: 3909540 (1975-09-01), Maryscuk
patent: 3936609 (1976-02-01), Waldeck

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