04896319 is referenced by 158 patents and cites 8 patents.

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 switch 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 user that is in the same group (virtual network) as the source user.

Title
Identification and authentication of end user systems for packet communications network services
Application Number
7/175544
Publication Number
4896319
Application Date
March 31, 1988
Publication Date
January 23, 1990
Inventor
Bruce R Zelle
Naperville
IL, US
Ronald C Weddige
Western Springs
IL, US
Scott B Steele
Naperville
IL, US
Gary A Roediger
Downers Grove
IL, US
William P Lidinsky
Naperville
IL, US
Agent
Werner Ulrich
Assignee
American Telephone and Telegraph Company AT&T Bell Laboratories
NJ, US
IPC
H04Q 11/04
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