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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 20 Configuring T1/E1 Controllers
Configuring T1 Controllers
Configuring T1 Controllers
Use the following steps to perform a basic T1 controller configuration: specifying the T1 controller,
specifying the framing type, specifying the line code form, specifying the channel-group and time slots
to be mapped, configuring the cable length, configuring the serial interface, configuring PPP
encapsulation, and enabling keepalive packets. 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.
Note In the following procedure, press the Return key after each step unless otherwise noted. At any time,
you can exit the privileged level and return to the user level by entering disable at the Router# prompt.
To configure the T1 interfaces, complete the following steps in the global configuration mode:
Step 10
keepalive [period [retries]]
Example:
Router(config-if)# keepalive
[
period
[
retries
]]
Enables keepalive packets on the interface and specify the number of
times keepalive packets are sent without a response before the router
disables the interface.
Step 11
Router(config-if)# end
Router#
Exits interface configuration mode.
Command Purpose
Command Purpose
Step 1
enable
Enables privileged EXEC mode. Enter your password if prompted.
Step 2
configure terminal
Enters global configuration mode.
Step 3
controller t1
slot/subslot
Example:
Router(config-controller)#
controller t1 0/0
Specifies the controller that you want to configure. The command has the
following syntax:
• slot—Slot number of the interface. The slot number should be 0.
• subslot—Subslot number of the interface. The supported range for
subslot is 0 to 15.
Step 4
Router(config-controller)# framing
esf
Specifies the framing type.
Step 5
Router(config-controller)# linecode
b8zs
Specifies the line code format.
Step 6
Router(config-controller)#
channel-group 0 timeslots 1-24
speed 64
Specifies the channel-group and time slots to be mapped. After you
configure a channel-group, the serial interface is automatically created.
• The default speed of the channel-group is 64.
• The supported range for channel-group is 0 to 23.