业务对网络性能的要求直接来源于业务对端到端客户感知(主观质量)的满意程度的需求。尤其对于目前在网络中涌现出的越来越多的实时业务,如VoIP、IPTV、VOD等业务对端到端的可用带宽、时延、抖动和丢包十分敏感,这些性能参数严重影响着此类业务的开展和运营维护。这些指标的组合整体反映了承载网络所能提供的QoS,因此准确把握这些网络QoS指标是对网络承载性能进行测评的基础。业务QoS保障成重要问题QoS是指网络中多个环节共同提供的性能,包括路由队列管理、应用层QoS保障、IP层QoS措施和链路层QoS保障。每一个环节 Business requirements for network performance come directly from the business’s satisfaction with end-to-end customer perception (subjective quality). Especially for the more and more real-time services emerging in the network such as VoIP, IPTV and VOD are very sensitive to end-to-end available bandwidth, delay, jitter and packet loss, and these performance parameters seriously affect this Business development and operation and maintenance. The combination of these indicators as a whole reflects the QoS provided by the bearer network. Therefore, accurately grasping these network QoS indexes is the basis for evaluating the bearer performance of the network. Business QoS Protection is an Important Problem QoS refers to the performance provided by multiple links in the network, including routing queue management, application layer QoS guarantee, IP layer QoS measures, and link layer QoS guarantees. Every link