Modem relay over packed based network

Abstract

A method of performing a negotiation session on a modem connection. The method includes receiving a plurality of negotiation signals from the source modem, by a first gateway, forwarding at least some of the received negotiation signals from the first gateway to a second gateway, over a packet based network, receiving, by the first gateway, responses to the forwarded negotiation signals from the second gateway, forwarding the responses from the second gateway to the source modem, by the first gateway, and transmitting from the first gateway to the source modem, response signals to at least some of the received negotiation signals, without receiving a response to the at least some of the signals from the second gateway.

Description

FIELD OF THE INVENTION[0001]The present invention relates to communication systems and in particular to systems which utilize modems.BACKGROUND OF THE INVENTION[0002]Traditional telephone networks comprise switched networks, e.g., the public switching telephone network (PSTN) and ISDN lines, in which a physical link path is established between the end users of a call. The voice signals of the call are passed, generally in a time domain multiplexed (TDM) manner, on the physical link path. On the other hand, data networks, such as the Internet, are generally packet based networks.[0003]Due to the wide availability of switched network lines, these lines are commonly used to access packet based networks. Data connections passed on switched network lines are referred to as voice band modem (VBM) connections. At opposite ends of a VBM connection, modems translate data signals into voice signals and translate voice signals from the telephone network into data signals. The tasks of the mode...

AI Technical Summary

Benefits of technology

"The present invention relates to a method for improving the quality of a connection between two modems over a hybrid link path, which includes at least one non-VBM segment. The method involves forming a connection between the modems using a time-deception technique, which causes a peer modem to calculate a round trip delay (RTD) value different from the delay between the two modems. This RTD value is used to improve the quality of the connection performance. The invention also provides various techniques for managing the connection, such as demodulation, error correction, data compression, and flow control. The use of the time-deception technique allows for the formation of a connection with improved quality, even if the parameters of the connections are different."

Problems solved by technology

In addition, not performing DC termination substantially reduces power consumption and the memory consumption of the gateways.

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