An out-of-band ranging technique is automatically initiated at a customer premises equipment unit when the equipment is installed, when power is restored after a power failure or interruption, upon verification of the equipment, upon reconnection after a disconnection of the equipment or the like. To...http://www.google.se/patents/US6807188?utm_source=gb-gplus-sharePatent US6807188 - Ranging arrangement and method for TDMA communications
