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Connecting Cisco Voice Network Modules to the
Network
Revised: May 1, 2008, OL-12812-01
This guide describes how to connect Cisco voice network modules to your network. It contains the
following sections:
• Voice Network Modules, page 1
• 2- and 4-Channel Voice Network Modules, page 2
• 4-, 8-, and 48-Channel High-Density Voice Network Modules, page 2
• 60-Channel High-Density Voice Network Module, page 3
• Voice Network Module LEDs, page 7
• IP Communications High-Density Digital Voice or Fax Network Module, page 8
• Related Documents, page 16
• Obtaining Documentation, Obtaining Support, and Security Guidelines, page 17
Voice Network Modules
The voice functionality built into Cisco IOS software enables modular access routers to carry voice
traffic, such as telephone calls and faxes, as Voice over IP (VoIP) simultaneously with data traffic over
LANs, MANs, and WANs. Voice network modules convert telephone voice signals into a form that can
be transmitted over an IP network.
Voice network modules convert telephone voice signals into a form that can be transmitted over an IP
network. These modules have one or two slots for installing supported interface cards. Voice interface
cards (VICs) or voice/WAN interface cards (VWICs) installed in the voice network module provide
physical connections to the telephony equipment or network, and are connected using the appropriate
cables.
You can install one voice interface card in a 1-slot voice network module, and two voice interface cards
in a 2-slot module.