Title :
New synchronous digital transmission system with network node interface
Author :
Ueda, Hiromi ; Tsuji, Hisao ; Tsuboi, Toshinori
Author_Institution :
NTT Network Syst. Dev. Center, Kanagawa-ken, Japan
Abstract :
The authors describe a synchronous digital transmission system using the network node interface (NNI) that compiles with CCITT recommendations G.707, G.708, and G.709. To offer device independence for function enhancement and to permit a flexible network, the recommendations are implemented as modules A, B, C, and ADP. Module A is a fiberoptic line terminating multiplexer and a generator. Module B is a CV-11 cross-connect system with NNI. Module C converts the existing lower speed interfaces to NNI. ADP converts NNI to the 100-Mb/s existing interface to make use of the existing facilities. The specifications of each module are given, and field trials are discussed
Keywords :
digital communication systems; multiplexing equipment; optical links; standards; CV-11 cross-connect system; fiberoptic line terminating multiplexer; field trials; network node interface; synchronous digital transmission system; Art; Digital circuits; Optical fibers; Oscillators; Switching systems; Synchronous digital hierarchy; Telephony; Transfer functions; Transmission lines; Very large scale integration;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64199
