Multiplex communications – Wide area network – Packet switching
Patent
1995-02-27
1996-10-22
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
375362, H04J 306
Patent
active
055684882
ABSTRACT:
A pointer re-setting method and apparatus are disclosed wherein resetting in a re-setting process of a pointer which is required for conversion from a transmission line frame phase into an in-apparatus frame phase is performed at an advanced timing to minimize invalid data. The pointer re-setting circuit includes retiming circuit 81 for latching a count value 112 from an in-apparatus frame counter 6 in response to a data head signal 111 from buffer 5, decoder circuit 7 for producing pulse signal 113 indicating a pointer insertion position, retiming circuit 91 for retiming the output from retiming circuit 81 at the timing of pointer insertion position signal 113 when inhibition signal 115 is not outputted from pointer value renewal inhibition signal generation circuit 11, incoincidence detection circuit 10 for outputting incoincidence signal 118 when the output values of the two retiming circuits 81 and 91 do not coincide with each other, retiming circuit 13 for latching incoincidence signal 118 from the incoincidence detection circuit 10 in response to the pointer insertion position signal 113, and pointer value renewal inhibition signal generation circuit 11 for producing a signal to inhibit renewal of the pointer value in response to pointer insertion position signal when incoincidence signal 118 is generated from the incoincidence detection circuit 10.
Chin Wellington
NEC Corporation
Vu Huy D.
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