Communication protocol for statistical data multiplexers arranged in a wide area network

Patent 5153876 Issued on October 6, 1992. Estimated Expiration Date:

December 13, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Sin, Kwai S.

Assignee

Digital Equipment Corporation, Pty. Limited, Inc.

Application

No. 450277 filed on 12/13/1989

US Classes:

370/392, Processing of address header for routing, per se370/401, Bridge or gateway between networks370/474Assembly or disassembly of messages having address headers

Examiners

Primary: Olms, Douglas W.
Assistant: Samuel, T.

Attorney, Agent or Firm

Cesari & McKenna

International Class

H04J 003/02

Abstract

A network topography and associated protocol for exchanging data and control information between stations arranged in a daisy-chain wide-area-network (WAN) and a local-area-network (LAN). The protocol includes a circuit layer which routes messages between WAN stations, and a slot layer which routes slots between LAN channels and WAN devices. The protocol uses virtual circuits to route messages between devices. Broadcast messages distribute control information to all circuits. A circuit-specific control message allows passing control information to each circuit. Virtual circuits are established with a broadcast circuit-connect message and disconnected with a broadcast circuit-disconnect message. The maximum message size is regulated in accordance with the transmission speed of links over which a message must travel.