Multiplex communications – Wide area network – Packet switching
Patent
1990-06-28
1991-09-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701051, 375 40, 375100, H04J 116, H04J 314, H04L 102
Patent
active
050519794
ABSTRACT:
Errorless switching of digital signals from a service channel is achieved even to an alternate channel, when the signals have a format in which the payload can float within the frame or in which the overhead bytes of the service channel may be different from the overhead bytes of the alternate channel. A preprovisioned delay is provided on the service channel. The amount of delay between corresponding frames containing the same payloads in the digital signals being transported in each channel is measured and added on the alternate channel, thus aligning the channels. The payloads within corresponding frames in the digital signals being transported in each channel are aligned by passing a pointer value indicating the start of the payload of the signal being transported in the service channel to the alternate channel and shifting the payload of the signal being transported in the alternate channel in accordance with the passed pointer value. Once the two signals are frame and paylaod aligned, a switch is made from the signal transported on the service channel to the signal transported on the alternate channel.
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Chaudhuri S.
Maione A.
AT&T Bell Laboratories
Kizou H.
Olms Douglas W.
Stafford Thomas
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