Planning for
Support of Voice
and Video in a
Campus Network
Accommodating Voice and Video in Campus Networks
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-1
Unified Communications
Components of Unified
Communications
 IP phones
 Call agent (Cisco Unified
Communications Manager)
 Voice Gateways to PSTN
 Application server (voice
mail)
 Conference station (voice and
video)
 IP network (router and
switches)
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-2
IP Telephony Components
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-3
Characteristics of Voice and Data
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SWITCH v1.0—8-4
Video Applications
Video collaboration
Cisco TelePresence
IP surveillance
Digital media systems
Characteristics of video applications
 Most are interactive
 Video contains voice as well
 Requires a connection with little delay to prevent
jitter (same as with voice)
 Requires a high-bandwidth connection depending
on the video resolution
 Peer-to-peer traffic
 Video endpoints are connected to the access layer
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-5
Voice and Video Traffic
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-6
Requirements for Voice, Data, and Video
Traffic
Requirements
Voice traffic
Data traffic
Video traffic
Bandwidth
Low
High
High
Delay
Short
Constant or
short
Jitter
Little
Packet loss
Little
Mostly no
problem
Mostly no
problem
Mostly no
problem
Availability
High
High
Medium
Power
Yes
None
None
Security
Medium
High
Low or medium
Provisioning
Management
High (DHCP)
Medium
(DHCP)
Medium
© 2009 Cisco Systems, Inc. All rights reserved.
Little
Little
SWITCH v1.0—8-7
Voice and Video in the Campus Network
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-8
Summary
 IP phones, call agent, and application servers are used for unified
communications.
 Voice sends a constant data stream while data traffic sends
changing amounts of data (bursts).
 Video applications increase bandwidth requirements in the
network.
 Video collaboration, digital media systems, and IP surveillance
are emerging video applications.
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-9
© 2009 Cisco Systems, Inc. All rights reserved.
SWITCH v1.0—8-10