Multiplex communications – Wide area network – Packet switching
Patent
1993-02-09
1994-11-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, H04J 314
Patent
active
053612531
ABSTRACT:
Method of transferring, via a transmission medium comprising asynchronously time-division-multiplexed transmission channels, a data stream comprised of data cells. A monitoring apparatus at the beginning of the transmission medium stores, for each transmission channel, a counter position (variable) which, when a data cell arrives at the monitoring apparatus, is amended as a function of time which has elapsed from a reference time instant. Depending on the amended counter position and a threshold value, the data cell is granted or refused access to the downstream transmission medium. The reference time instant is determined by the monitoring apparatus completely or at least partly, independent of the time instant of the appearance of the data cells. A first option provides for the monitoring apparatus to shift the reference time instant in time in accordance with a fixed sequence schedule. According to a second option, the reference time instant is shifted in time in accordance with a fixed time schedule. The method brings about a reduction in memory capacity.
REFERENCES:
patent: 4484326 (1984-11-01), Turner
patent: 4807224 (1989-02-01), Naron et al.
Feijen Maurice M.
Van Der Wal Jacob C.
Jung Min
Koninklijke PTT Nederland N.V.
Olms Douglas W.
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