INPUT-OUTPUT INTERFACE DEVICE BETWEEN A DATA SWITCHER AND A PLURALITY OF TRANSMISSION LINES

摘要

1. An input-output interface device connected between a data switching exchange and a plurality of forward and backward data transmission channels, the data being processed in "packet" mode in the data switching exchange and being transmitted arranged in "frames" on the transmission channels, each frame containing one or several packets of data, each packet being composed of a plurality of data bytes, each data transmission channel comprising a data transmission line and a clock transmission line, said device comprising a bit stage that comprises a multiplexer (5) connected from the backward data transmission channels and a demultiplexer (4) connected to the forward data transmission channels (3a.1-3a.128), a time base circuit (21) generating an elementary operation cycle, a plurality of bit operation memories (12, 16, 17, 19), each bit operation memory being associated to a logic operator (11, 15, 18, 20) able to perform the logic or arithmetic operation assigned to the associated memory, characterized in that it further comprises a line condition scanner (10) cyclically scanning sequentially the clock transmission lines (3b1-3b.128 and 3d.1-3d.128), the scanner (10) cycle being substantially shorter than the shortest duration of a bit transmitted on said channels (3a.1-3a.128 and 3c.1-3c.128), each bit operation memory (12, 16, 17, 19) being constituted of as many words as backward and forward channels, word addressing in each bit operation memory as well as adressing of either the multiplexer or the demultiplexer being determined by the said scanner (10) position, any condition change by transition of any clock transmission line causing the scanner (10) to stop which then triggers the said addressing and the operation of the said time base circuit (21) for an elementary operation cycle, each bit operation memory together with its operator performing during said elementary operation cycle the logic or arithmetic operation assigned thereto, and, at the end of said elementary operation cycle, said scanner (10) resuming scanning.