Multiplexing of video and data sources in an ATM access network

✍ Scribed by B. Kraimeche

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 197 KB
• Volume: 24
• Category: Article
• ISSN: 0140-3664
• DOI: 10.1016/s0140-3664(00)00360-1

✦ Synopsis

ATM-over-DSL is a promising access technology for real-time MPEG video. In this paper, we ®rst describe a con®guration of an ATMover-VDSL access network that can handle VBR video and ABR data calls. Then, we analyze a priority multiplexing strategy for video and data calls at the ATM-based DSL access multiplexor.

Using a Markov-modulated ¯uid model for MPEG video calls we present a computationally ef®cient ¯uid analysis of cell loss for video and data traf®c at the multiplexor. We derive the output ¯uid process of the video buffer and approximate it with a 2-state model. This 2-state model is used to analyze cell loss in the low-priority data buffer. We also obtain data cell loss by a ®rst-order approximation method that is commonly used in priority queues. Our results indicate that our 2-state approximation is fairly accurate while computationally ef®cient compared to the full model. In addition, the results show that the commonly used ®rst-order approximation can be excessively inaccurate.