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Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note
OL-3008-01
Chapter 4 Configuring the Data Interfaces
Configuring T1 and E1 Interfaces
Configuring T1 Interfaces
To configure a new T1, Channelized T1 (CT1)/PRI, or CT1/PRI-channel status unit (CSU) interface, or
to change the configuration of an existing interface, perform these steps:
Command Purpose
Step 1
gateway> enable
Password:
<password>
gateway#
Enter enable mode.
Enter the password.
You know you have entered enable mode when the prompt
changes to
gateway#.
Step 2
gateway# configure terminal
Enter configuration commands, one
per line. End with Ctrl-Z.
gateway(config)#
Enter global configuration mode.
You know you have entered global configuration mode
when the prompt changes to
gateway(config)#.
Step 3
gateway(config)# ip routing
Enable routing protocols as required for your global
configuration.
Step 4
gateway(config)# controller t1 1/0
Enter controller configuration mode for the CT1/PRI
interface at the specified slot/port location.
This example configures a T1 interface in slot 1 and unit 0.
Step 5
gateway(config-controller)# clock
source line
Specify which end of the circuit provides clocking.
The clock source should be set to use internal clocking
only for testing the network or if the full T1 line is used as
the channel group. Only one end of the T1 line should be
set to internal.
Step 6
gateway(config-controller)#
framing esf
Specify the T1 framing type. The framing type defines the
control bits and data bits. Cisco supports super frame (SF)
and extended super frame (ESF) for T1s.
SF is used in channel bank robbed bit signalling (RBS)
configurations. SF uses the framing bit to identify the
channel and voice-related signaling within the frame. SF
is not recommended for PRI configurations.
ESF is required for 64 kb operation on DS0s. ESF requires
2k-framing bits for synchronization. The remaining 6k is
used for error detection, CRC, and data link monitoring.
ESF is recommended for PRI configurations.
This example uses ESF.
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