Multiplex communications – Wide area network – Packet switching
Patent
1983-05-05
1985-09-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 77, 370 79, 370102, H04Q 1104, H04J 316
Patent
active
045424985
ABSTRACT:
A high bit-rate coupler is connected between a PCM channel bidirectional multiplex and a packet switching unit. Each channel carries packet words, such as octets, grouped in frames separated by flags 01111110. The coupler processes the first level related to the bits of the frame level of a packet exchange procedure. For each received frame, the coupler extracts the filling zeros from the received words between the flags, controls a frame checking sequence included at the end of each frame, counts the realigned words without filling zeros to be transmitted to the switching unit, and detects the flags and the start and end of the frame. At the transmitting end, the coupler inserts filling zeros in each transmitted frame when it detects six contiguous bits "1" in the words delivered from the switching unit, derives the frame checking sequence, transmits the dealigned words with the filling words, and produces flags. The memory capacity of the coupler is reduced to the characteristics or contexts for processing a word in each channel. Processing means common to the packet mode channels processes progressively the received words and the transmitted words without storing of entire frames. A storing means of the coupler has as many memory cells as channels for storing in each cell the contexts written after a word of the respective channel has been processed, and read for the next word in the respective channel to be processed after the other channels have been processed, at the rate of one word per channel.
REFERENCES:
patent: 4392222 (1983-07-01), Ando
patent: 4413337 (1983-11-01), Dauphin et al.
patent: 4446555 (1984-05-01), Devault et al.
patent: 4456989 (1984-06-01), Johnson et al.
Bodros Christian Y.
Le Besco Joel V.
Sichez Yves R.
Kuntz Curtis
Olms Douglas W.
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