Abstract: An efficient framing scheme is described for the transmission of frame overhead data in next generation ADSL modems. As a result of this new framing scheme, the available data rate for the transmission of payload data increases. High payload data rates and consequently wider reach of the ADSL modem are the most important performance requirements and customer care-abouts for ADSL modems. This application explains the new framing scheme in detail and provides examples for the computation of the framing parameters.

Abstract: Systems and methods are disclosed for determining characteristics of a communications medium, such as a subscriber loop. In one embodiment, a system is disclosed to determine at least one characteristic associated with a subscriber loop. The system includes memory that stores data indicative of signal responses and loop characteristics for a plurality of loop configurations. A processor is programmed to ascertain at least one loop characteristic associated with the subscriber loop based on evaluation of data associated with a signal response received via the subscriber loop relative to at least a portion of the data indicative of signal responses stored in the memory.

Abstract: A method of providing downstream suspend type Q-mode for ADSL between a central office (CO) modem and consumer premise equipment (CPE) modem is presented. Q-mode allows for transmitter power savings while at the same time minimizes the generation of time-varying crosstalk. During the initialization stage the CO transmits a pair of messages wherein the first message informs the CPE of a power cutback level and the second message indicates a signal point for each subchannel from which is formed the Q-mode signal Q. The CO sends the CPE the maximum and minimum number of frames for exit and the CPE chooses a number of frames within those limits. The system enters the Q-mode by the CO sending a Q-mode enter signal. The system exits the Q-mode by the CO sending an exit signal. During Q-mode, all high modem layers are frozen, and upon exit are restarted.

Abstract: An efficient framing scheme is described for the transmission of frame overhead data in next generation ADSL modems. As a result of this new framing scheme, the available data rate for the transmission of payload data increases. High payload data rates and consequently wider reach of the ADSL modem are the most important performance requirements and customer care-abouts for ADSL modems. This application explains the new framing scheme in detail and provides examples for the computation of the framing parameters.