Method for eliminating multiple modulating and demodulating of group 3 fax over packet and low data rate digital networks
AssigneeLSI Logic Corporation
InventorsJianWei Bei, Mehrdad Abrishami, Richard Meyers
Life of this patent
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Abstract
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 channel 1 frequencies) to detect tandem fax relay gateways and effectively remove unnecessary relay gateways.
Claims14
A method of communicating a facsimile over a network having two endpoint fax relay gateways and at least two inner fax relay gateways, comprising:
- (a) identifying at least two inner fax relay gateways;
- and
- (b) placing the two inner fax relay gateways in a fax-bypass mode wherein the two inner fax relay gateways relay fax information without modulation and demodulation of the information.
A network for communicating a facsimile, comprising:
- a plurality of fax relay gateways, wherein at least two of the fax relay gateways can be placed in a fax-bypass mode wherein the two fax relay gateways relay fax information without modulation and demodulation of the information.
A fax relay gateway comprising:
- a relay path for a normal mode of relaying information wherein fax information is relayed with at least one of modulation and demodulation of the information;
- and
- a second relay path for a fax-bypass mode wherein the fax relay gateway relays fax information without modulation and demodulation of the information.
Dependencies are inferred from the claim text.