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Channelized T1 Port Adapter Installation and Configuration 25
Configuring 2CT1 Interfaces
C
onfiguring Channelized T1 ISDN PRI Interfaces
Following are instructions for a basic channelized T1 ISDN PRI configuration: enabling a controller
and specifying IP routing. You might also need to enter other configuration commands depending
on the requirements for your system configuration and the protocols you plan to route on the
interface. For complete descriptions of configuration commands and the configuration options
available, refer to the publications listed in the “Related Documentation” section on page 2.
The PRI group must be mapped before the 2CT1 controller can be configured (there is only one PRI
group for each controller). The following are controller commands used to map the PRI group:
•
isdn switch-type switch-type
•
controller t1 chassis slot number/port adapter number/interface port number
•
clock source line
•
linecode b8zs
•
framing esf
•
loopback
•
shutdown
•
pri-group [timeslots list]
pri-group timeslots is a number between 1 to 24. (Timeslots 1 to 23 represent the B channels,
and timeslot 24 represents the D channel. While the numbering scheme for entering timeslots is
1 to 24, the system recognizes the numbering of timeslots as 0 to 23. The PRI group is configured
by using timeslot 24 [the D channel], which is recognized by the system as timeslot 23.) You can
enter timeslots individually and separate them by commas or enter them as a range separated by
a hyphen (for example, 1-3, 8, 9-18). The default DS0 speed of the PRI group is 56 kbps.
Note
If you do not specify the timeslots, the controller is configured for 23 B channels
(timeslots 1 to 23) and one D channel (timeslot 24).
Note
Cisco 7000 series and Cisco 7500 series routers identify the PRI group as a serial interfaces
by chassis slot number, port adapter slot (0 or 1), interface port number (0 or 1), and timeslot 23. For
example, the address of the 2CT1 installed in chassis slot 4, port adapter slot 1, interface port 1, and
timeslot 24, would be recognized by the system as serial 4/1/1:23.
In the following procedure, press the Return key after each configuration step:
Step 1
At the privileged-level prompt, enter configuration mode and specify that the console
terminal will be the source of the configuration commands as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Step 2
Identify the ISDN switch type. In the following example, the switch primary-5ess (a
switch for the United States) is identified as the switch type:
Router(config)# isdn switch-type primary-5ess
Note
The ISDN switch type that you identify is for all ISDN interface ports installed in
the router.