Multiplex communications – Wide area network – Packet switching
Patent
1989-09-15
1992-06-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 857, 370 951, H04J 302, H04J 316
Patent
active
051213885
ABSTRACT:
A multi-user Time Division Multiplex (TDM) system includes a plurality of stations and at least one erasure node located between groups of the stations. When a station reads the destination identification bits of a received time slot and determines that it is the destination for that slot, it sets the status of a slot-read bit, which follows the destination identification bits, to indicate that the slot has been read. When an erasure node detects a set slot-read bit it erases all or part of the associated slot, thereby enabling the reuse of that slot by subsequent stations. An interface apparatus, which enables the TDM system to connect the other TDM systems, filters intra-system communications from inter-system communications using the slot-read bit. When the interface apparatus detects a set slot-read bit it knows that the slot has been read and, therefore, is an intra-system communication which should be blocked or discarded. Since inter-system communications have not been read, the slot-read bit is not set and, consequently, the interface apparatus routes that slot to one of the other TDM systems as determined by the destination identification bits of the slot.
REFERENCES:
patent: 3483329 (1969-12-01), Hunkins et al.
patent: 3600518 (1971-08-01), McNeilly et al.
patent: 3755786 (1973-08-01), Dixon et al.
patent: 4321703 (1982-03-01), Schwaertzel et al.
patent: 4941142 (1990-07-01), Kida
Perdikaris A.
Rodrigues Manoel A.
AT&T Bell Laboratories
Caccuro J. A.
Chin Wellington
Olms Douglas W.
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