Moon Hong Jin, Chang Seong Hyun

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 5, No. 12, pp. 3185-3193, Dec. 1998
10.3745/KIPSTE.1998.5.12.3185,   PDF Download:

Abstract

ATM Networks have the clock recovery problem by CDV(Cell Delay Variation) %uC5F3 %uC0C8 the queing random delay inside the network. To absorb this CDV at the receiver. SAR(Segmentation and Reassemble) header has a clock information and receiver recovers the source clock by using the header information. The random delay is caused by factors and it is particularly influenced by two parameters: loads of network and the number of switch. Because the real time VBR service needs CDV removal and exact timing between source and receiver, clock recovery schemes that consider those requirements are adequate. So far, clock recovery schemes for Circuit Emulation of CBR service are proposed. A clock recovery scheme for VBR service is not develope yet, but the scheme will be similar to that of CBR. We propose a VBR clock recovery algorithm based on the SRTS method of CBR and based on the wavelet transform. Proposed algorithm is available for AAL layer to use a VBR image service in an ATM networks. We can see that a result of simulation has a various QoS satisfying more than VBR traffic because of selecting a value which is outputted from a block of wavelet transform and sending it.

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