Patent ID: 6807188
Filing Date: 2004-10-19
Classification: H04J,H04L,H04N

Abstract:
Apparatus for use in at least one local equipment unit at a prescribed local location to obtain a signal propagation ranging delay interval between the at least one local equipment unit and a remote equipment unit at a prescribed remote location, the apparatus comprising:an indicator for supplying an indication of whether or not power is ON in the local equipment unit; an indicator responsive to a power ON indication for indicating whether or not the at least one local equipment unit has being initialized by establishing a ranging delay interval; a controllable transmitter, responsive to an indication that the at least one local equipment unit has not been initialized, for transmitting an out-of-band ranging delay tone at a frequency band out side a frequency band in which data signals are transmitted from said at least one local equipment unit to said remote equipment unit; and a receiver for receiving a stop transmitting out-of-band ranging tone message from said remote equipment unit to control the controllable transmitter to terminate transmission of said out-of-band ranging delay tone, and for receiving a message containing a representation of a delay interval to be applied to in-band data signals being transmitted from said at least one local equipment to said remote equipment.