Title :
SDH network in Japan and SDH 52/156 Mbps (VC-3/4) digital cross-connect systems with hit-less switching function
Author :
Nishihata, Kazuhiro ; Umino, Shun-ichi ; Shinomiya, Terufumi
Author_Institution :
Nippon Telegraph & Telephone Corp., Chiba, Japan
Abstract :
Since 1989, NTT has been using the synchronous digital hierarchy (SDH) transmission system to create simplified, easy-to-operate transmission networks in Japan. This paper describes the SDH networks at NTT and the newly developed SDH 52M/156M digital cross-connect system (Module AX), which enables real-time VC-3/VC-4 path level network operation and hit-less switching, thus providing support for relocation of existing telecommunication cables through cross-connection at the VC-3/VC-4 level. It also supports a standard Q interface and synchronous equipment management function (SEMF), and is based on the telecommunication management network (TMN) principle
Keywords :
digital communication; network interfaces; synchronous digital hierarchy; telecommunication network management; 156 Mbit/s; 52 Mbit/s; Japan; Module AX; NTT; Q interface; SDH 52M/156M system; SDH network; SDH transmission system; TMN; VC-3/VC-4 level; digital cross-connect systems; hit-less switching; network operation; synchronous digital hierarchy; synchronous equipment management; telecommunication cables; telecommunication management network; Cables; Containers; Intelligent networks; Multiplexing; Real time systems; Switches; Synchronous digital hierarchy; Telecommunication network management; Telecommunication standards; Telecommunication switching;
Conference_Titel :
Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-1825-0
DOI :
10.1109/ICC.1994.368935
