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Troubleshooting E1 and T1 Controllers
Setting a Loopback on the E1 Controller
To set a loopback on the E1 controller, perform the first task followed by any of the following tasks
beginning in global configuration mode:
Task
Select the E1 controller and enter controller
configuration mode.
Set a local loopback on the E1 line.
Set a network payload loopback on the E1
line.
Exit configuration mode when you have
finished configuring the controller.
Setting a Loopback on the T1 Controller
To set a loopback on the T1 controller, perform the first task followed by any of the following tasks
beginning in global configuration mode:
Task
Select the T1 controller and enter controller
configuration mode.
Set a diagnostic loopback on the T1 line.
Set a local loopback on the T1 line. You can
select to loopback the line or the payload.
Set a remote loopback on the T1 line. This
loopback setting will loopback the far end at
line or payload, using IBOC (in band
bit-orientated code).
Exit configuration mode when you have
finished configuring the controller.
To remove a loopback, use the no loopback command.
Note
Cisco ME-3600X-24CX Series Switch Chassis Configuration Guide
2-10
Chapter 2
Command
controller e1 0/number
number—Specifies the location of the
•
controller. The number range for T1 and E1 is 1
to 16.
loopback local
loopback network {line | payload}
End
Command
controller t1 0/number
•
number—Specifies the location of the
controller. The number range for T1 and E1 is 1
to 16.
loopback diag
loopback local {line | payload}
loopback remote iboc
Note
Only remote iboc is supported, since FDL is
not supported.
End
Configuring T1/E1 Interfaces
OL-27620-01
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