Third, they should support good quality of service, which can make the transition of real-time multimedia traffic from application level to carriergrade smoothly.
第三，路由交换设备必须能够提供良好的服务质量保障，使得网络实时多媒体业务从应用级平稳过渡到运营级。
2
Thehighlightedapplicationof IPTV as a carrier-grade service lies in its being interactive and real-time. Therefore, the requirement of IPTV for service quality is extremely exacting.