Multiplex communications – Wide area network – Packet switching
Patent
1978-10-12
1982-02-02
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 306, H04J 312
Patent
active
043143687
ABSTRACT:
Simple and reliable decoding of T-1 type pulse code information is achieved by combining a fast-acting recirculating frame recovery circuit with a simplified signal output register. The frame recovery circuit uses a recirculating 386-bit control word in which all positions which cannot be the main-frame bit position are continuously recorded by the continuous comparison of pairs of incoming data bits spaced 386 bits apart. Following a sufficient number of iterations of the control word to statistically identify all 385 non-main-frame bit positions with a high degree of probability, the remaining unidentified position is read out as the main-frame bit position, and is used to reset the frame clock generator. The signalling pulses recovered from the correctly framed data train are distributed to the proper channel relays by a simplified output circuit which loads the signalling bits into a buffer register at a slow rate dictated by the data train parameters, then unloads the buffer register into the output latches at a rate sufficiently fast to make it impossible for the channel relays to spuriously respond to momentary invalid signals occurring during the unloading process.
REFERENCES:
patent: 3542957 (1970-11-01), Mitchell
patent: 3575557 (1971-04-01), McGowen
patent: 3576947 (1971-05-01), Kruger
patent: 4002845 (1977-01-01), Kaul
patent: 4059731 (1977-11-01), Green
patent: 4085294 (1978-04-01), Thomas
DeCoursey Calvin H.
Townsend Todd V.
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