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4-11
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 E1 Interfaces
To configure a new E1 interface (balanced or unbalanced) 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 e1 1/0
Enter controller configuration mode for the CE1/PRI
interface at the specified slot/port location.
This example configures a E1 interface in slot 1 and
unit 0.
Step 5
gateway(config-controller)# framing
crc4
Specify the framing type as cyclic redundancy check 4
(CRC4).
Step 6
gateway(config-controller)# linecode
hdb3
Specify the line code format as high-density bipolar 3
(HDB3).
Step 7
gateway(config-controller)#
channel-group 0 timeslots 1,3-5,7
Specify the channel group and time slots to be mapped.
When configuring a E1 data line, channel-group
numbers can be values from 0 to 30.
Timeslots are assigned to channels. One or more
timeslots or ranges of timeslots belong to the channel
group. The first timeslot is numbered 1. For an E1
controller, the timeslot range is from 1 to 31. For E1
PRI scenarios, all 31 T1 timeslots are assigned as
ISDNPRI channels.
The default line speed when configuring an E1
controller is 64 kbps.
In this example, channel-group 0 consists of 5 timeslots
and runs at a speed of 64 kbps per timeslot.
Step 8
gateway(config-controller)# interface
serial 1/0:0
gateway(config-if)#
Configure each channel group as a virtual serial
interface. Specify the E1 interface, unit number, and
channel group to modify and enter the interface
configuration mode.
You know you have entered interface configuration
mode when the prompt changes to
gateway(config-if)#.
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