Additive time synchronous system in existing SDH networks

Author

Serizawa, Yoshizumi

Author_Institution

Central Res. Inst. of Electr. Power Ind., Tokyo, Japan

Volume

14

Issue

2

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

19

Lastpage

28

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;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems Magazine, IEEE

Publisher

ieee

ISSN

0885-8985

Type

jour

DOI

10.1109/62.746736

Filename

746736