Title :
Additive time synchronous system in existing SDH networks
Author :
Serizawa, Yoshizumi
Author_Institution :
Central Res. Inst. of Electr. Power Ind., Tokyo, Japan
fDate :
2/1/1999 12:00:00 AM
Abstract :
A simplified SDW (synchronous digital hierarchy)-based time synchronous system that does not need modification of existing SDH transmission equipment (STE) and clock supply equipment (CSE) is proposed. The system has auxiliary time synchronizing equipment attached to existing STE and CSE, where frequency and time are separately synchronized, and which enables us to partially time-synchronize an SDH network or to introduce a time synchronous system locally. Experimental time synchronizing devices using a data communication channel (DCC) in the section overhead (SOH) showed potentially satisfactory performance; synchronization errors of a 4-link system are of the order of sub-microseconds
Keywords :
data communication equipment; synchronisation; synchronous digital hierarchy; telecommunication networks; 4-link system; SDH network; SDH networks; SDH transmission equipment; additive time synchronous system; auxiliary time synchronizing equipment; clock supply equipment; data communication channel; experimental time synchronizing devices; submicroseconds; synchronization errors; time synchronous system; Delay effects; Frequency synchronization; Intelligent networks; Master-slave; Phase locked loops; Pulse measurements; Synchronous digital hierarchy; Time measurement; Timing; Transmission line measurements;
Journal_Title :
Aerospace and Electronic Systems Magazine, IEEE
