ATM小区级复用AAL2话音流量和TCP/IP数据的性能评估

IEEE ATM Workshop '99 Proceedings (Cat. No. 99TH8462) Pub Date : 1999-05-24 DOI:10.1109/ATM.1999.786887

T. Okutani, H. Watanabe, T. Nisase

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引用次数: 2

摘要

ATM适配层类型2 (AAL2)已被标准化，以在ATM网络上承载高度压缩的语音业务，并具有沉默抑制。ITU-T建议通过AAL2虚拟信道(VC)进行ATM业务时使用CBR (constant bit rate)，以保证语音质量。然而，AAL2 VC的流量特性是可变比特率(VBR)，它通过优先级复用和非优先级复用两种复用技术区别于ATM单元级的TCP/IP数据流量。优先级复用可以在保证AAL2语音质量的情况下传输到TCP/IP。非优先级复用可以在一定条件下通过AAL2实现VBR业务的应用，从而优化ATM骨干网的传输效率。

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Performance evaluation of multiplexing AAL2 voice traffic and TCP/IP data at the ATM cell level

ATM adaptation layer type 2 (AAL2) has been standardized to carry highly compressed voice traffic with silence suppression over an ATM network. The ITU-T recommends using the constant bit rate (CBR) for ATM service carried through an AAL2 virtual channel (VC) to guarantee voice quality. However, the traffic characteristic of AAL2 VC is variable bit rate (VBR), which is different from that of the TCP/IP data traffic at the ATM cell level by two multiplexing techniques: priority multiplexing and non-priority multiplexing. Priority multiplexing enables the transfer to TCP/IP data with the AAL2 voice quality guaranteed. Non-priority multiplexing can enable the application of VBR services through AAL2 under certain conditions, and can thus help optimize transmission efficiency in the ATM backbone network.

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IEEE ATM Workshop '99 Proceedings (Cat. No. 99TH8462)

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