Effect of Clock Noise on the Synchronization Performance of Constant Bit Rate (CBR) Traffic in an ATM Network

T. Jayawardena, C. Olszewski

Abstract:	When Constant Bit Rate (CBR) traffic with an associated frequency is carried over an ATM network, the frequency needs to be reconstructed at the exit node of the ATM network. One method for reconstructing this frequency is the Synchronous Residual Time Stamp (SRTS) method. This method relies on two synchronized clocks, one at the entrance and the other at the exit of the ATM network. This paper quantifies the synchronization performance of the signal leaving the ATM network when different levels of noise are present in the signal source clock, the clock at the entrance to the ATM network, or the clock at the exit of the ATM network. Simulations were performed to study the effects of these noise sources separately and in combination. The SRTS scheme itself generates noise with a characteristic time deviation (TDEV) signature. The noise on the signal leaving the ATM network is determined by both the SRTS signature noise and the noise of clocks in the entrance and exit nodes of the ATM network. As the noise of the clocks rise above certain levels, the noise on the signal tends to be determined more by the clock noise than the inherent noise from the SRTS scheme.
Published in:	Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1998 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	413 - 422
Cite this article:	Jayawardena, T., Olszewski, C., "Effect of Clock Noise on the Synchronization Performance of Constant Bit Rate (CBR) Traffic in an ATM Network," Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1998, pp. 413-422.
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