Channelized T1 Port Adapter Installation and Configuration 45
Configuring 2CT1 Interfaces
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 7200 series routers identify the PRI group as a serial interface by port adapter slot
number, interface port number (0 or 1), and timeslot 23. For example, the address of the 2CT1
installed in port adapter slot 1, interface port 1, and timeslot 24, would be recognized by the system
as serial 1/1:23.
In the following procedure, press the Return key after each configuration step:
Step 1
At the privileged-mode 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.
Step 3
At the prompt, specify the controller to configure by entering the command controller,
followed by t1, and port adapter slot number/interface port number. The example that
follows is for the 2CT1 in port adapter slot 1, interface port 1:
Router(config)# controller t1 1/1
Step 4
Specify the controller’s clock source by entering the clock source command as follows:
Router(config-controller)# clock source line
Note
You can set the clock source to use internal clocking for testing purposes. One end
of a T1 circuit must provide the clock source.
Step 5
Specify the controller’s framing type by entering the framing command as follows:
Router(config-controller)# framing esf
Step 6
Specify the controller’s linecode format by entering the linecode command as follows:
Router(config-controller)# linecode b8zs
