Specifications

CHAPTER 8
Voice and Video in a Campus Network
Chapter 8
Voice and Video in a Campus Network
Voice over IP (VoIP) has become common in the business world, and now Video over IP is becoming more integrated into
networks. Neither should be added to a network without advance planning to ensure good voice and video quality. Some
benefits of converging voice, video, and data networks include:
n Consolidating network expenses: Only one wire and one switch port are needed per user. One network to provision
and manage.
n More efficient bandwidth use: Bandwidth can be used for data when there is not an active voice/video session.
n Lower telephony costs: Internal calls use the data network, rather than the PSTN.
n Innovative services: Ability to unify a company’s various methods of communication.
n For service providers, the ability to sell new services: Can lead to increased revenue, flexibility in pricing, and
access to new communication devices.
Voice, video, and data have different network requirements. Voice requirements include low bandwidth, little delay, small
amounts of jitter (variable delay), small amounts of packet loss, a highly available network, and PoE. Security require-
ments are about average, but management is highly important.
Video requirements depend on whether it is a one-way stream or an interactive video session. One-way streams use a
fairly steady amount of bandwidth but in interactive sessions the bandwidth varies widely. Typical requirements include
high bandwidth, little delay, small amounts of jitter, and little packet loss. High availability is not as important, and PoE is
not needed. Security and management needs are medium.
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue