Browse Prior Art Database

Redundant Protocol Minimizing Retransmission Needs

IP.com Disclosure Number: IPCOM000061833D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Baudelot, F: AUTHOR [+2]

Abstract

In voice and data networks, the voice analog signals as well as signalling information provided by telephone lines are converted into digital form and then multiplexed (MPX) with data from Data Line Interfaces. The multiplexed data are packetized and transmitted over a high speed digital link. Bit errors occurring on data flowing over the digital network are conventionally corrected through no acknowledgements (NACK) and retries between digital nodes of the network. Thanks to the high speed over the digital network, the retry protocol is transparent to the end user. The retry operations may be implemented using different means. For instance, the traffic may be buffered within each network node for being retransmitted upon receiving a NACK or dropped after an ACK.

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Redundant Protocol Minimizing Retransmission Needs

In voice and data networks, the voice analog signals as well as signalling information provided by telephone lines are converted into digital form and then multiplexed (MPX) with data from Data Line Interfaces. The multiplexed data are packetized and transmitted over a high speed digital link. Bit errors occurring on data flowing over the digital network are conventionally corrected through no acknowledgements (NACK) and retries between digital nodes of the network. Thanks to the high speed over the digital network, the retry protocol is transparent to the end user. The retry operations may be implemented using different means. For instance, the traffic may be buffered within each network node for being retransmitted upon receiving a NACK or dropped after an ACK. This solution increases traffic jams within the nodes and, which is more important, should increase transmission delays which need being minimized for voice signals. A better solution would involve systematically repeating each packet transmitted from one node to the next. The receiving node then performs validity checkings and drops redundant packets or reinsert any violated portions of a received packet.

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