New IP QoS Architecture for Voice and Data Convergence over DSL Lines
Ibrahiem El Emary, Sherif M. Gad, A. Al-Zo · 2007
Abstract: Digital subscriber lines (DSL) offer the possibility to deliver broadband services over the existing telephone network. Before deploying DSL, the subscriber loops must be tested to see whether they can support high-speed data services, and at what rate. With regards to Voice over IP, VoIP converts analog voice signals into IP packets and distributes them across a WAN. VoIP is a delay-sensitive application. For POTS-quality voice, the network must be fine tuned end-to-end before implementing VoIP. This fine-tuning should incorporate a series of optimization techniques in order to improve the overall quality of service (QoS). Furthermore traffic shaping must be used to ensure VoIP reliability. There are two essential requirements to ensure VoIP quality: minimization of end-to-end delay and jitter. In this paper, the performance of QoS architecture was analyzed.. The basic metrics that were evaluated are the end-to-end delay of voice packets across the access network and the bandwidth consumed by a voice call.