Lsi Logic Corporation

Richard Meyers

Jianwei Bei

Mehrdad Abrishami

Abhinandan Dodamini

Abhinandan Dodamani

A method and apparatus for maintaining a fax transmission over a relay network that includes at least first and second portions and a relay portion that couples the first and second portions to each other. At a second gateway connecting the second portion to the relay portion, data frames received over the relay portion are processed to determine if they are corrupted, and signals are sent back to a first gateway to resend any data frames that are corrupted. The first gateway connects the first portion to the relay portion.

Fax transmission over congested or corrupted wideband network, or narrowband network, using ECM error block flow control

A technique for detection and bypass of unnecessary modulation/demodulation and compression/decompression of Group 3 fax, in a telecommunication network having more than one pair, or 'tandem,' Group 3 fax relay gateways. Detection and the effective removal of a Group 3 fax tandem reduces end-to-end processing delays of the facsimile signal, and improves performance of the Group 3 fax communication. The invention uses frequencies normally used for voice information (such as V.21 channelfrequencies) to detect tandem fax relay gateways and effectively remove unnecessary relay gateways.

Method for eliminating multiple modulating and demodulating of group 3 fax over packet and low data rate digital networks

A system and method for fax transmission over a fax relay network that includes at least a wideband portion and a narrowband portion, includes a first fax relay gateway communicatively connecting a sending fax machine on the wideband portion of the network to the narrowband portion of the network, the first fax relay gateway receiving image data from the sending fax machine and outputting digitized image data in accordance with a data rate of the narrowband portion of the fax relay network. A second fax relay gateway, communicatively connects a receiving fax machine to the narrowband portion of the network. At least one of the first fax relay gateway or the second fax relay gateway includes a control process that determines whether an amount of data stored in a buffer in the fax relay gateway is greater or less than a particular threshold or determines that the amount of jitter in the narrow band network exceeds a particular threshold, and if so, initiates a retrain procedure to adjust the fax data rate.

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Montgomery Village, MD, United States of America

Richard Meyers