Multiplex communications – Wide area network – Packet switching
Patent
1980-06-04
1982-09-07
Brown, Thomas W.
Multiplex communications
Wide area network
Packet switching
370105, H04J 312
Patent
active
043487580
ABSTRACT:
A digital debouncing and storage apparatus operates on the receiving end of a digital carrier span line used in a telephony system to couple a multiplex signal to a receiving site to be used by the switching network control. Incoming signaling bits of the multiplex signal are stored in a random access memory at a particular storage location reserved for each channel contained in a group. There is also stored at the location previous timing information concerning each sampling bit. The circuit operates to time any change in the value of a status bit to insure that it lasts long enough to indicate a valid change of state. An up/down counter serves to time each status bit during predetermined signaling frames based on a count inserted into the counter indicative of the timing information as stored in memory. Thus each channel associated with the multiplex signal has stored in memory a unique status bit as well as timing information pertinent to that bit. The circuit operates over a predetermined number of frames whereby if the status of the bit has changed between one binary value to another, the circuit will recognize such a change only after a given number of signaling frames have elapsed. In this manner, contact bounce or channel interference which may effect the signaling bit is eliminated from interferring with system operation.
REFERENCES:
patent: 3851110 (1974-11-01), Kelly et al.
patent: 4133980 (1979-01-01), Moed
Brown Thomas W.
International Standard Electric Corporation
O'Halloran John T.
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