Copyright 2003 VoFR Network Voice over Frame Relay technology consolidates voice and voice-band data with data services over a Frame Relay network.
Copyright 2003 VoATM Voice over ATM is an ideal transport for multiservice networks, particularly for customers who already have an ATM network installed.
Copyright 2003 ATM ATM supports several mechanisms for controlling delay and delay variation: –QoS Enables traffic to be provisioned with specific bandwidth and delay-variation guarantees. –Virtual-circuit queuing Treats each traffic stream differently. For example, voice traffic can be allocated priority over delay-insensitive traffic. –Small, fixed-length cells The 53-byte ATM cells reduce queuing delay and delay variations associated with variable-size packets, and also reduce delays through intermediate switches.
Copyright 2003 Converged Network A converged network allows the enterprise network to converge over a common IP transport. The number of WAN facilities is reduced, as is the number of devices required to terminate those facilities.
Copyright 2003 Cisco Architecture for Voice, Video, and Integrated Data (AVVID) AVVID has the following building blocks: –Clients, such as phones, PCs, PDAs, fixed and wireless IP telephones, H.323 videoconferencing equipment –Network platforms (LAN switches, routers, gateways, and other equipment) –Intelligent network services (QoS, security, accounting, and management) –Internet middleware (distributed customer contact suites, messaging solutions, multimedia, and collaboration) –Internet business integration (integrators, strategic partners, and customers) –Internet business solutions (Oracle, Siebel, and Ariba enabled, accelerated, and delivered through Cisco AVVID.)
Copyright 2003 Jitter Jitter is the variation of packet interarrival time.
Copyright 2003 Other Common Issues with QoS Loss of packets Because IP networks do not guarantee service, they usually exhibit a much higher incidence of lost voice packets than ATM networks. Echo Caused by a conversion from two wires (local loop) to four wires and impedance mismatch.