Cisco 3825 - Manual (Page 71)

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 4 Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line
Configuration Sequence
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, follow these steps, while in the global configuration mode:
Step 1 Specify the controller that you want to configure. Controller T1 0/0/0 maps to the first port of the
Cisco 2-port T1/E1-RAN interface card in slot 0. Controller T1 0/0/1 maps to the second port of the
Cisco 2-port T1/E1-RAN interface card in slot 0.
Router(config)# controller t1 slot/subslot/port
Step 2 Specify the framing type.
Router(config-controller)# framing esf
Step 3 Specify the line code format.
Router(config-controller)# linecode b8zs
Step 4 Specify the channel-group and time slots to be mapped. Once you configure a channel-group, the serial
interface is automatically created.
Note The default speed of the channel-group is 56.
Router(config-controller)# channel-group 0 timeslots 1-24 speed 56
Step 5 Configure the cable length.
Router(config-controller)# cablelength feet
Note Although you can specify a cable length from 0 to 450 feet, the hardware recognizes only two ranges: 0
to 49 feet and 50 to 450 feet. For example, entering 35 feet uses the 0 to 49 range. If you later change
the cable length to 40 feet, there is no need for reconfiguration because 40 is within the 0 to 49 range.
However, if you change the cable length to 50, the 50 to 450 range must be used. The actual number that
you enter is stored in the configuration file.
Step 6 Exit controller configuration mode.
Router(config-controller)# exit
Step 7 Configure the serial interface. Specify the T1 slot (always 0), subslot, port number, and channel-group.
Router(config)# interface serial slot/subslot/port:channel
Step 8 Enter the following command to configure PPP encapsulation.
Router(config-if)# encapsulation ppp
Step 9 Enable keepalive packets on the interface and specify the number of times that keepalive packets will be
sent without a response the interface is brought down:
Router(config-if)# keepalive [ period [retries]]