Multiplex communications – Wide area network – Packet switching
Patent
1988-12-16
1990-05-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 326
Patent
active
049264168
ABSTRACT:
In fast packet-switching networks, packets of particular connections (CS1, CS2) (e.g., voice, moving-image) are to be treated with priority over packets of other connections (PS1, PS2, PS3) (e.g., data) (without delay jitter and loss of information). Prior art arrangements are divided into a circuit-switching portion (for CS1, CS2) and a packet-switching portion (for PS1, PS2, PS3). The circuit-switching portion operates on a time-division multiplex basis. On each incoming line, 70 packets each containing 40 octets, for example, are combined into a frame. If no special steps were taken, delays on the order of 40.times.70.times.8 bits=22,400 bits would result in each switching stage; for each input of a switching stage, 22,400 bits of storage would be necessary. According to the invention, all packets are divided within the exchange, into subpackets of equal length and distributed to subframes. Switching takes place on the basis of subframes. Delays and memory location requirements are reduced in the ratio of frames:subframes. Preferably, the connections (CS1, CS2) to be treated with priority are assigned fixed positions in each frame and each subframe throughout the call. Subpackets of the other packets are preferably inserted in sequence into free positions, and are recombined into complete packets within each switching stage.
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ALCATEL N.V.
Marcelo Melvin
Olms Douglas W.
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