Multiplex communications – Wide area network – Packet switching
Patent
1988-03-31
1989-10-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 61, 370 941, 370 856, H04J 326
Patent
active
048721590
ABSTRACT:
A high capacity metropolitan area network (MAN) is described. Data traffic from users is connected to data concentrators at the edge of the network, and is transmitted over fiber optic data links to a hub where the data is switched. The hub includes a plurality of data switching modules, each having a control means, and each connected to a distributed control space division switch. Advantageously, the data switching modules, whose inputs are connected to the concentrators, perform all checking and routing functions, while the 1024.times.1024 maximum size space division switch, whose outputs are connected to the concentrators, provides a large fan-out distribution network for reaching many concentrators from each data switching module. Distributed control of the space division permits several million connection and disconnection actions to be performed each second, while the pipelined and parallel operation within the control means permits each of the 256 switching modules to process at least 50,000 transactions per second. The data switching modules chain groups of incoming packets destined for a common outlet of the space division switch so that only one connection in that switch is required for transmitting each group of chained packets from a data switching module to a concentrator. MAN provides security features including a port identification supplied by the data concentrators, and a check that each packet is from an authorized source user, transmitting on a port associated with that user, to an authorized destination use that is in the same group (virtual network) as the source user. Each packet has an associated high or low priority indication. Requests for connections in the space division switch for a chained group of packets whose first packet has a high priority indication are given priority.
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Hemmady Jayant G.
Lidinsky William P.
Roediger Gary A.
Steele Scott B.
Weddige Ronald C.
American Telephone and Telegraph Company AT&T Bell Laboratories
Marcelo Melvin
Olms Douglas W.
Ulrich Werner
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