Title :
Precision time-transfer in transport networks using digital crossconnect systems
Author :
Grover, W.D. ; Moore, T.E.
Author_Institution :
Alberta Telecommun. Res. Centre, Edmonton, Alta., Canada
fDate :
28 Nov-1 Dec 1988
Abstract :
The authors describe a technique for precise synchronization of the time-of-delay clocks in networks of digital cross-connect systems (DCS), intended to enhance the performance of reconfigurable transport networks. The method is specifically devised to exploit the fine time resolution of the carrier signals to which a DCS has direct access. The resulting scheme is a master-slave, multisite, implicitly-delay-compensated, nonhierarchical time-transfer method with a theoretical precision of one bit time at the carrier rate. A worst-case estimate of delay asymmetry (including jitter effects) suggests that time-transfer error of under one microsecond should be obtainable. The method is most easily supported by an n/n space-switching DCS which has equal delay on all paths through its core and has a bridging connection feature. A circuit module for DCS hardware support of the time-transfer function is outlined
Keywords :
digital communication systems; electronic switching systems; switching networks; telecommunication networks; carrier signals; circuit module; delay asymmetry; digital cross-connect systems; jitter effects; space-switching; synchronisation; time-of-delay clocks; time-transfer error; transport networks; Circuits; Clocks; Delay effects; Delay estimation; Distributed control; Hardware; Jitter; Master-slave; Signal resolution; Synchronization;
Conference_Titel :
Global Telecommunications Conference, 1988, and Exhibition. 'Communications for the Information Age.' Conference Record, GLOBECOM '88., IEEE
Conference_Location :
Hollywood, FL
DOI :
10.1109/GLOCOM.1988.26081