H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04L 1/00 (2006.01) H04L 12/64 (2006.01)
Patent
CA 1206239
ABSTRACT OF THE DISLOSURE The 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 detecting six contiguous bits "1" in the words delivered from the switching unit, derives the frame checking sequence, transmits the desaligned 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 are common to the packet mode channels and processes progressively the received words and the transmitted words without storing of entire frames. A memorizing means of the coupler has as many memory cells as channels for memorizing 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.
427466
Bodros Christian
Le Besco Joel
Sichez Yves
Bodros Christian
Le Besco Joel
Robic Robic & Associes/associates
Sichez Yves
LandOfFree
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