Multiplex communications – Wide area network – Packet switching
Patent
1983-12-23
1986-02-04
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, 370 60, H04J 116, H04J 314, H04J 302
Patent
active
045690421
ABSTRACT:
In a voice packet switching network (10), following call path set-up, continuity packets (500a-c) are transmitted between the call originating (100) and destination (101) nodes to check call path continuity. The continuity packets carry time stamps of their (503) and the preceding continuity packet's (504) time of transmission, to permit determination of call path transit delay, and computation of asynchrony between clocks (200) of the two nodes. A call path is considered acceptable if one half the path round trip transit delay does not exceed a predetermined maximum acceptable delay. Subsequently transmitted data packets are discarded if their transit delay exceeds the predetermined maximum acceptable delay. Transit delay of a data packet is computed from originating and terminating node clock readings at the time of transmission and reception of the packet, respectively, adjusted for asynchrony of the two clocks.
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AT&T Bell Laboratories
Olms Douglas W.
Scutch III Frank M.
Volejnicek David
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