Methods, systems and computer program products establishing a communication configuration for a modem connection to compensate for echo noise
First Claim
1. A method for configuring a local modem for a communication session with a remote modem, the method comprising the steps of:
- detecting during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modem;
initiating a retrain when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion; and
boosting a transmit power to the remote modem of a transmitter of the local modem during the retrain initiated by the initiating step.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods, systems and computer program products for configuring a modem communication session when conditions associated with echo noise on a digitally discontinuous channel are detected are provided. The condition is detected at the local modem by reference to the local modem'"'"'s respective transmit and receive rates. A low transmit rate is an indication of a channel problem. Furthermore, where the transmit rate is also lower than the receive rate, the problem is likely at the remote modem end not just a uniformly noisy channel. This combination of conditions has been found to result, for example, from middle echo noise. Once the remote modem side condition is detected various steps may be taken by the local modem to improve the channel performance including boosting its transmit power (which may raise signal power at the remote modem receiver without affecting the level of echo noise), enabling only a low symbol rate for its transmissions (which may concentrate the signal power in a narrower spectrum band to improve signal power) and/or disabling the use of strong pre-emphasis by the remote modem (which may reduce echo noise by reducing remote modem transmit power over a portion of the spectrum). In particular, these approaches have been found to improve performance of V.90 modems operating in fall back (V.34) mode.
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Citations
30 Claims
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1. A method for configuring a local modem for a communication session with a remote modem, the method comprising the steps of:
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detecting during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modem;
initiating a retrain when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion; and
boosting a transmit power to the remote modem of a transmitter of the local modem during the retrain initiated by the initiating step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for configuring a local modem for a communication session with a remote modem on a digitally discontinuous channel subject to echo noise, the method comprising the steps of:
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detecting during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modern; and
selecting a predetermined symbol rate of 2400 symbols per second for a transmitter of the local modem in a INFO1a signal when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion;
wherein the local modem and the remote modem are at least one of a V3.4 standard modem and a V.90 standard modem. - View Dependent Claims (12, 13, 14)
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15. A system for configuring a local modem for a communication session with a remote modem, the system comprising:
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means for detecting during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modern;
means for initiating a retrain when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion; and
means for boosting a transmit power to the remote modem of a transmitter of the local modem during the retrain initiated by the initiating step. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system for configuring a local modem for a communication session with a remote modem on a digitally discontinuous channel subject to echo noise, the system comprising:
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means for detecting during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modem; and
means for selecting a predetermined symbol rate of 2400 symbols per second for a transmitter of the local modem by specifying the symbol rate in a INFO1a signal when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion;
wherein the local modem and the remote modem are at least one of a V.34 standard modem and a V.90 standard modem. - View Dependent Claims (22)
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23. A computer program product for configuring a local modem for a communication session with a remote modem, comprising:
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a computer readable storage medium having computer readable program code means embodied therein, the computer readable code means comprising;
computer readable code that detects during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modem;
computer readable code that initiates a retrain when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion; and
computer readable code that boosts a transmit power to the remote modem of a transmitter of the local modem during the retrain initiated by the initiating step. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A computer program product for configuring a local modem for a communication session with a remote modem on a digitally discontinuous channel subject to echo noise, the computer program product comprising:
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a computer readable storage medium having computer readable program code means embodied therein, the computer readable code means comprising;
computer readable code that detects during startup of the communication session a receive data rate from the remote modem and a transmit data rate to the remote modem; and
computer readable code that selects a predetermined symbol rate of 2400 symbols per second for a transmitter of the local modem in a INFO1a signal when the transmit data rate is less than the receive data rate if the transmit data rate is less than a predetermined criterion;
wherein the local modem and the remote modem are at least one of a V.34 standard modem and a V.90 standard modem. - View Dependent Claims (30)
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Specification