Specifications

Configure a Channelized T3 Interface Processor
IC-84
Cisco IOS Interface Configuration Guide
To configure a T1 channel as an external port, use the following commands beginning in EXEC
mode:
Note Only T1 channels 1 through 3 can be configured as an external T1.
Note Although you can specify a cable length from 0 to 655 feet, the hardware only recognizes the
following ranges: 0 to 133, 134 to 266, 267 to 399, 400 to 533, and 534 to 655. For example, entering
150 feet uses the 134 to 266 range. If you later change the cable length to 200 feet, there is no change
because 200 is within the 134 to 266 range. However, if you change the cable length to 399, the 267
to 399 range is used. The actual number you enter is stored in the configuration file.
After you configure the external T1 channel, you can continue configuring it as a channelized T1
from the MIP. All channelized T1 commands might not be applicable to the T1 interface. To define
the T1 controller and enter controller configuration mode use the following command in global
configuration mode:
After you configure the channelized T1 on the MIP, you can continue configuring it as you would a
normal serial interface. All serial interface commands might not be applicable to the T1 interface.
To enter interface configuration mode and configure the serial interface that corresponds to a T1
channel group, use the following command in global configuration mode:
For more information, refer to the “Configure Each T1 Channel” section and the “Specify a
Synchronous Serial Interface” section in this chapter.
For an example of configuring an external T1 channel, see the “Channelized T3 Interface Processor
Configuration Examples” section later in this chapter.
Step Command Purpose
1 show controller t3
slot/port-adapter/port
Determine if the external device connected to the
external T1 port is configured and cabled correctly by
locating the line
Ext1... in the display output. If the
line status is
OK, a valid signal is being received and
the signal is not an all-ones signal.
2 configure terminal Enter configuration mode.
3 controller t3 slot/port-adapter/port Select the CT3IP and enter controller configuration
mode.
4 t1 external channel [cablelength feet]
[linecode {ami | b8zs}]
Configure the T1 channel (values are 1, 2, and 3) as an
external port and optionally specify the cable length
and line code. The default cable length is 133 feet, and
the default line code is b8zs.
Command Purpose
controller t1 slot/port Select the MIP and enter controller configuration
mode.
Command Purpose
interface serial slot/port:t1-channel Define the serial interface for a T1 channel on the MIP
(values are 1 to 28) and enter interface configuration
mode.