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26 Channelized T1 Port Adapter Installation and Configuration
VIP2 and the 2CT1 Port Adapter
Step 3
Specify the controller to configure by entering the command controller, followed by t1,
and chassis slot number/port adapter number/interface port number. The example that
follows is for the 2CT1 in chassis slot 3, port adapter slot 1, interface port 1:
Router(config)# cont t1 3/1/1
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
Step 7
Map timeslots to the controller’s PRI group by entering the pri-group command. The
following example shows PRI-group timeslots 1, 3 through 5, and 7 (the B channels)
selected and mapped to timeslot 24 (the D channel), which is recognized by the system
as timeslot 23:
Router(config-controller)# pri-group timeslots 1,3-5,7
Router(config-controller)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/1/1:23,
changed state to down
%LINK-3-UPDOWN: Interface Serial3/1/1:23, changed state to up
Note
In the above example, the line-protocol status for timeslot 24 (listed in the output
as timeslot 23) represents the entire PRI group.
Step 8
If IP routing is enabled on the system, assign an IP address and subnet mask to the PRI
group with the interface and ip address commands as follows.
Note
For channelized T1 ISDN PRI, the PRI group is configured by using timeslot 24,
which is recognized by the system as timeslot 23.
Router(config-controller)# interface serial 3/1/1:23
Router(config-if)# ip address 10.1.15.1 255.255.255.0
Router(config-if)#
Step 9
Add any additional configuration commands required to enable routing protocols and
adjust the interface characteristics.