Browse Prior Art Database

Performance Improvement for Open Systems Interconnection Protocol Over High-Speed Networks

IP.com Disclosure Number: IPCOM000037135D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Salmony, M: AUTHOR

Abstract

Significantly faster communication between computers in open networks is obtained by low-cost enhancement of the open systems interconnection (OSI) transport layer. The improvement is particularly marked over new high-speed sequence-preserving networks, such as FDDIs (fiber distributed data interfaces), B-ISDNs (broadband integrated services digital networks) or DQDBs (distributed queue dual buses). The enhancement preserves the interaction of computers using only conventional standard OSI.

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Performance Improvement for Open Systems Interconnection Protocol Over High-Speed Networks

Significantly faster communication between computers in open networks is obtained by low-cost enhancement of the open systems interconnection (OSI) transport layer. The improvement is particularly marked over new high-speed sequence-preserving networks, such as FDDIs (fiber distributed data interfaces), B-ISDNs (broadband integrated services digital networks) or DQDBs (distributed queue dual buses). The enhancement preserves the interaction of computers using only conventional standard OSI.

A computer (receiver) awaiting information from another computer (sender) issues a retransmission request to the sender at short notice to prevent the sender from being kept waiting for a potentially long time before the unacknowledged information is resent, as is the case with prior-art systems.

The mechanisms requesting retransmission have the following principal features: 1st scheme retransmission requests for lost or

discarded

transport service data units

(TSDUs) are issued as soon as

missing information is detected in

the arriving sequence;

2nd scheme periodical requests for lost or

discarded

TSDUs are issued whenever a (newly

introduced) timer expires.

The retransmission requests are communicated in either case via option fields such that interaction with the OSI standard is maintained.

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