Title :
Primary rate access (PMXA) in subscriber loops
Author_Institution :
Siemens AG, Munchen, West Germany
Abstract :
The preliminary rate access (PMXA) connects ISDN (integrated-services digital network) user equipment with 2 Mb/s interfaces to the digital local exchange. At present, two types of network access are provided: the basic access with two user (B) channels and one signalling channel (D) for main stations and small PBXs, and the primary rate access with several basic accesses for medium to large digital PBXs. The primary rate access has 30 B-channels plus one 64 kb/s signalling channel (30×B+D64). The PMXA signal, with a gross bit rate of 2048 kb/s, is mainly transmitted over existing balanced-pair voice-frequency copper cable. For new subscriber loops, fiber-optic cable is being installed. An in-depth analysis of the line equipment for the PMXA is provided. The network termination and the line termination for transmission via copper cable and optical fiber are described
Keywords :
ISDN; electronic switching systems; private telephone exchanges; subscriber loops; 2 Mbit/s; 2048 kbit/s; 64 kbit/s; ISDN; PBXs; PMXA; balanced-pair voice-frequency copper cable; basic access; digital local exchange; fiber-optic cable; line equipment; line termination; network access; network termination; preliminary rate access; signalling channel; subscriber loops; user channels; user equipment; Circuit faults; Copper; ISDN; Optical attenuators; Optical fiber cables; Optical fiber devices; Optical fiber networks; Optical waveguides; Subscriber loops; Wire;
Conference_Titel :
Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on
Conference_Location :
Stockholm
DOI :
10.1109/EURCON.1988.11139
