Installation guide

Overview of Cisco WAN and Voice Interface Cards 1-5
WAN and Voice Interface Card Options for Cisco 3600 Series Routers
Voice Interface Numbering in Cisco 3600 Series Routers
Voice interfaces are numbered differently from WAN interfaces described in the previous
section, “Unit Numbering.” Voice interfaces are numbered as follows:
interface type chassis slot/voice module slot/voice interface
If you have a four-channel voice network module installed in slot 1 of your router, the voice
interfaces will be:
• Slot 1, voice network module slot 0, voice interface 0, referred to as voice 1/0/0 (closest
to chassis slot 0)
• Slot 1, voice network module slot 0, voice interface 1, referred to as voice 1/0/1
• Slot 1, voice network module slot 1, voice interface 0, referred to as voice 1/1/0
• Slot 1, voice network module slot 1, voice interface 1, referred to as voice 1/1/1 (farthest
from chassis slot 0)
WAN and Voice Interface Card Options for Cisco 3600 Series
Routers
Table 1-1 lists the WAN and voice interface card options available for Cisco 3600 series
routers with their minimum software requirements for supported Cisco IOS releases.
Note Voice interface cards can only be used in voice network modules (NM-1V and
NM-2V).