ECHO CANCELLER TOUCH-UP PERIOD IN AN ECHO-CANCELLING MODEM

摘要

Abbreviated subsystem retraining in a local modem including an information processor having a plurality of subsystems configurable with the information processor for data communications over a first transmission medium, e.g., an analog local loop of a public telephone network. The local modem subsystems are configured with the information processor in accordance with at least one operating characteristic of the first transmission medium, such as the echo characteristics or the like. A remote modem for data communications over a second transmission medium, e.g., a digital telephone network (DTN) is coupled to the first transmission medium for providing an exchange of information between the local modem and the remote modem. The local modem is operable in a retraining mode, responsive to the at least one operating characteristic of the first transmission medium, e.g., echo divergence, observed by the information processor during the exchange of information between the local modem and said remote modem. The local modem then sends an informational signal to the remote modem for reconfiguring at least one of the plurality of subsystems such as the echo canceller with the information processor.