Multiplex communications – Wide area network – Packet switching
Patent
1982-12-13
1984-12-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, 371 5, H04J 314
Patent
active
044908172
ABSTRACT:
A trunk controller and processor arrangement for monitoring the error rate occurring in packets received from a high speed trunk. Within a packet switching system, packets comprising logical addresses, and voice/data information are communicated through the system by packet switching networks which are interconnected by high speed digital trunks with each of the latter being directly terminated on both ends by trunk controllers. During initial call setup of a particular call, central processors associated with each network in the desired route store the necessary logical to physical address information in the controllers which perform all logical to physical address translation on subsequent packets of the call. Each network comprises stages of switching nodes which are responsive to the physical address associated with a packet by a controller to communicate that packet to a designated subsequent node. Each trunk controller has an error rate monitoring circuit for measuring the error rate occurring in packets during transmission over the attached trunk. The error rate circuit notifies the associated processor when error rate excursions increase or decrease in excess of a multitude of processor specified percentages of error rate.
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AT&T Bell Laboratories
Chin Wellington
Moran J. C.
Olms Douglas W.
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