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Proceedings Paper

A novel timestamp based adaptive clock method for circuit emulation service over packet network
Author(s): Jin-you Dai; Shao-hua Yu
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Paper Abstract

It is necessary to transport TDM (time division multiplexing) over packet network such as IP and Ethernet, and synchronization is a problem when carrying TDM over the packet network. Clock methods for TDM over packet network are introduced. A new adaptive clock method is presented. The method is a kind of timestamp based adaptive method, but no timestamp needs transporting over packet network. By using the local oscillator and a counter, the timestamp information (local timestamp) related to the service clock of the remote PE (provide edge) and the near PE can be attained. By using D-EWMA filter algorithm, the noise caused by packet network can be filtered and the useful timestamp can be extracted out. With the timestamp and a voltage-controlled oscillator, clock frequency of near PE can be adjusted the same as clock frequency of the remote PE. A kind of simulation device is designed and a test network topology is set up to test and verify the method. The experiment result shows that synthetical performance of the new method is better than ordinary buffer based method and ordinary timestamp based method.

Paper Details

Date Published: 19 November 2007
PDF: 11 pages
Proc. SPIE 6784, Network Architectures, Management, and Applications V, 678435 (19 November 2007); doi: 10.1117/12.741063
Show Author Affiliations
Jin-you Dai, Huazhong Univ. of Science and Technology (China)
Wuhan Research Institute of Posts and Telecommunications (China)
Shao-hua Yu, Wuhan Research Institute of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 6784:
Network Architectures, Management, and Applications V
Jianli Wang; Gee-Kung Chang; Yoshio Itaya; Herwig Zech, Editor(s)

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