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SIGNALLING TECHNIQUES AND DEVICE FOR HIGH SPEED DATA TRANSMISSION OVER VOICEBAND CHANNELS
SIGNALLING TECHNIQUES AND DEVICE FOR HIGH SPEED DATA TRANSMISSION OVER VOICEBAND CHANNELS
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机译:语音通道上的高速数据传输的信令技术和设备
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摘要
The present method (200, 300, 400) and device (500, 600, 700) modify phase two of the format set forth in the V.34 Recommendationof the International Telecommunication Union-Telecommunication Standardization Sector to prevent premature disconnection of callsbetween a call modem and an answer modem. The method and device efficiently ensure connection of the call for high speed datatransmission 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 a guard tone and a signalS1, 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.
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