Information Technology Reference
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might be instances where the FXO port of the router is attached to a loop of other devices
(such as in a home office environment) and the user wants the other devices to have a
chance to answer the call before the router picks up the line and processes it. In this case,
you can set the ring number to a higher value.
Configuring Digital Voice Ports
Cisco provides digital T1 and E1 ports in the form of Voice and WAN Interface Cards
(VWIC) for routers. These cards offer you the flexibility to configure them for a data con-
nection or a voice connection. Unlike analog interfaces, you must configure digital inter-
faces before they will operate correctly, because the router does not know the type of
network you will be using. As discussed in Chapter 1, “Traditional Voice Versus Unified
Voice,” two types of voice network configurations exist: T1/E1 channel associated signal-
ing (CAS) or T1/E1 common channel signaling (CCS; commonly referred to as ISDN Pri-
mary Rate Interface [PRI]). The type of network to which you are connecting dictates the
command you use to configure your VWIC card: ds0-group for T1/E1 CAS connections
or pri-group for T1/E1 CCS connections.
Example 6-5 demonstrates how to configure all 24 channels of a T1 CAS interface to con-
nect to a PSTN carrier.
Example 6-5
Configuring a T1 CAS PSTN Interface
CME_Voice# show controllers t1
T1 1/0 is down.
Applique type is Channelized T1
Cablelength is long gain36 0db
Transmitter is sending remote alarm.
Receiver has loss of signal.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20050620, FPGA: 20, spm_count = 0
Framing is SF, Line Code is AMI, Clock Source is Line.
Current port master clock:local osc on this network module
Data in current interval (215 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 215 Unavail Secs
CME_Voice# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
CME_Voice(config)# controller t1 1/0
CME_Voice(config-controller)# framing ?
esf Extended Superframe
sf Superframe
CME_Voice(config-controller)# framing esf
CME_Voice(config-controller)# linecode ?
 
 
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