Download Voice, Video, and Data Network Convergence: Architecture and by Juanita Ellis PDF

By Juanita Ellis

ISBN-10: 0122365429

ISBN-13: 9780122365423

*Covers the most recent criteria and people being constructed in an ever-evolving box *Provides perception into the newest know-how of video and information over instant networks and the way convergence should be a motive force during this *Provides an realizing of the real features at the back of every one vendor's technique to let for educated paying for judgements a up to date survey of 500 U.S. businesses with a number of destinations discovered that eighty one% are making plans to enforce IP Telephony on their neighborhood quarter networks (LANs) in 2003, and two-thirds are convergence for his or her huge sector networks (WANs) in addition. This contains voice, video and knowledge over not easy line and instant networks. this present day, new criteria and applied sciences are being built to help convergence and voice over IP (VoIP) and Video over IP and instant. simply because convergence covers the voice and knowledge international, it is going to be serious to appreciate all of those environments. This booklet offers designated info on convergence community versions, protocol stacks, routing algorithms, gateways and switches required to aid those networks. *Covers the most recent criteria and people being constructed in an ever-evolving box *Provides perception into the most recent expertise of video and knowledge over instant networks and the way convergence could be a motive force during this *Provides an knowing of the real functions at the back of each one vendor's strategy to enable for trained procuring judgements

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Additional info for Voice, Video, and Data Network Convergence: Architecture and Design, From VoIP to Wireless

Example text

Voice is much more sensitive to packet delay than packet loss. In addition to normal traffic congestion, QoS for VoIP is often dependent on lower layers that are ignorant to the voice traffic mingled with the data traffic. The ATM Forum and the ITU have specified different classes of services to represent different possible traffic types for VoATM. Designed primarily for voice communications, constant bit rate (CBR) and variable bit rate (VBR) classes have provisions for passing real-time traffic and are suitable for guaranteeing a certain level of service.

In effect, the network is moving from being the equivalent of a rail system, where design fundamentals dictate the specifics of the train (such as the wheel gauge and carriage shape), toward the equivalent of a road system, where any type of vehicle ranging from a motorcycle to a truck can travel on a single, simple infrastructure. Like the road system (and unlike the rail), traffic is granted its own autonomy. Instead of working to a strict, centrally controlled timetable and signaling system, the packets simply set out and steer themselves toward their destinations.

The public switched telephone network (PSTN) is one of the most reliable communications networks in existence. Using traditional PSTN services as an access point to the Internet has significantly encouraged the growth of data over costly Class-5 facilities, resulting in the need to reengineer this traditional TDM architecture. Convergence technologies will provide a packet-based architecture that combines the speed and efficiency of broadband with the full-featured signaling system 7 (SS7) architecture to create a hybrid network in which carriers and service providers can choose route options based on cost, efficiency, and fault management.

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