Signalling techniques and device for high speed data transmissio

Details Signalling techniques and device for high speed data transmissio Signalling techniques and device for high speed data transmissio

1994-12-14

1998-03-24

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375377, 379 93, 379 97, 379 98, H04B 138

Patent

active

057321043

ABSTRACT:
The present method (200,300, 400) and device (500, 600, 700) modify phase two of the format set forth in the V.34 Recommendation of the International Telecommunication Union-Telecommunication Standardization Sector to prevent premature disconnection of calls between a call modem and an answer modem. The method and device efficiently ensure connection of the call for high speed data transmission over voiceband channels, by modification of one of: a phase preliminary to phase one and phase two. One implementation, in the answer modem, includes transmitting a signal having first information, followed by a Signal S comprising of aguard tone and a signal S1, wherein an energy of a predetermined guard tone is greater than an energy of a predetermined range of frequencies of the Signal S1; and continuing transmitting and receiving in accordance with the modified V.34 operation.

REFERENCES:
patent: 5317594 (1994-05-01), Goldstein
patent: 5349635 (1994-09-01), Scott
patent: 5353280 (1994-10-01), Ungerbock
patent: 5528679 (1996-06-01), Taarud

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