H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/13
H04J 3/06 (2006.01) H04J 3/12 (2006.01)
Patent
CA 1044385
DATA AND SIGNALING MULTIPLEXING IN PCM SYSTEMS VIA THE FRAMING CODE Abstract of the Disclosure A subsystem is added to an existing PCM system to provide N additional data channels and to increase the number of signaling channels. The subsystem includes a framing code generator to produce a framing code having a data code bit position for each of 6N system frames with certain of the bit positions having a distinctive pattern of code bits to provide frame synchronization for the receiver of the existing system and the receiving portion of the subsystem. The N additional data channels are time multiplexed by timing signals from the frame code generator and then the frame code generator inserts each channel of N time multiplexed channels into a different one of N others of the code bit positions to convey the additional data in the framing code without altering the distinctive pattern of code bits. The framing code generator also provides other timing signals to increase the number of signaling channels. A framing code receiver of the subsystem recovers the additional data channels from the framing code, the additional signaling channels and synchronizes the system and subsystem in response to the distinctive pattern of code bits. The subsystem may be converted to Western Electric D2/D3 compatibility by opening a strap on each of the framing code generator and framing code receiver.
234266
Johnson Lehman H. (iii)
Maryscuk Thomas P.
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