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Carrier HDSL communication systems and equipment for service to and from telecom offices, namely, central office equipment, namely, interface cards, bridge extensions and transceivers; remote equipment, namely interface cards, bridge extensions and transceiver and customer location equipment for services using copper wire, namely interface cards, bridge extensions and transceivers and equipment for use with same said systems and equipment comprising high density range doublers, namely, interface cards, bridge extensions and transceivers; high density line units and central office units, namely, digital subscriber line access multiplexers and integrated digital subscriber line access switches, all being compliant with ETSI (European Telecommunications Standards Institute) technical standards as promulgated by ETSI