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Videoconferencing architecture guides.

Cisco Unified Videoconferencing Solution Reference Network Design

Historically, videoconferencing was done primarily over ISDN and time division multiplexed (TDM) networks using standard H.320. Running interactive video over data networks was not an option due to video's shared media characteristics, connectionless nature, and lack of guaranteed data flows. With the introduction of switched 10/100/1000 Mbps networks, high-end routers, and Layer 2 and Layer 3 quality of service (QoS), delivering interactive video over IP is now a reality. Today there is a large installed base of H.320 networks that incur large monthly access and switched usage charges. With the current advances to the IP networks, it is now possible to run interactive video over an IP network, thus reducing cost with converged voice, video, and data traffic over a common path. H.323 builds on top of existing IP data networks, scaling to larger deployments and providing greater features. The data sharing capability, remote camera control and enhanced high resolution and high fidelity codecs provide much better video conferencing experience with the endpoints available today. The adoption of videoconferencing to save travel time and costs has attributed to an increase in deployments of video endpoints and videoconferencing devices.

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