Time and frequency transfer in an asynchronous TCP/IP over SDH-network utilizing passive listening

Author

Emardson, R. ; Hedekvist, P.O. ; Nilsson, M. ; Ebenhag, S.C. ; Jaldehag, K. ; Jarlemark, P. ; Johansson, J. ; Pendrill, L. ; Rieck, C. ; Löthberg, P. ; Nilsson, H.

Author_Institution

Dept. of Meas. Technol., Swedish Nat. Testing & Res. Inst.

fYear

2005

fDate

29-31 Aug. 2005

Firstpage

908

Lastpage

913

Abstract

A technique for time and frequency transfer over an asynchronous TCP/IP network is being developed by SP, Swedish National Testing and Research Institute together with STUPI. When implemented, users will be able to compare their clocks by connecting to the system. The technique is based on passive listening to existing data traffic in the network. Since the network is asynchronous, intermediate clocks are located and compared at each router. We use the frame alignment bytes of the SONET/SDH protocol as references in order to compare these clocks. As a test bed for the experiment, we will use the Swedish University Computer Network (SUNET). A preliminary assessment of the technique in a lab environment will be performed late 2005

Keywords

IP networks; SONET; clocks; frequency measurement; synchronous digital hierarchy; time measurement; transport protocols; SDH network; SONET; asynchronous TCP/IP network; clocks; data traffic; frequency transfer; passive listening; time transfer; Clocks; Frequency; IP networks; Joining processes; Protocols; SONET; Synchronous digital hierarchy; TCPIP; Telecommunication traffic; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-9053-9

Type

conf

DOI

10.1109/FREQ.2005.1574054

Filename

1574054