Configuring The Loopback Mode For A T3 Controller - Cisco 10000 Series Configuration Manual

Chapter 6 1-Port Channelized OC-12/STM-4 Line Card Configuration
Where:
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The default is clock source internal.
In this example, a T3 controller is instructed to use a line clock source:
Router(config)# controller T3 1/0/0.1
Router(config-controller)# clock source line

Configuring the Loopback Mode for a T3 Controller

You can configure the loopback modes for a T3 controller by using the loopback command:
loopback {local | network | remote}
[no] loopback {local | network | remote}
The default is no loopback.
To disable loopback on the T3 controller, use the no form of the command.
Examples:
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Configuring a T3 Controller to Respond to Remote Loopback Commands
Use the equipment loopback command to run loopbacks in conjunction with remote equipment.
equipment [customer | network] loopback
Where:
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OL-8834-04
internal specifies that the internal clock source is used
line specifies that the network clock source is used
Configure a T3 controller for local loopback.
Router(config)# controller T3 1/0/0
Router(config-controller)# loopback local
Local loopback simultaneously loops all channels toward the router and transmits a T3 AIS to the
network. You can use local loopback to diagnose problems with the port when the port is isolated
from the network cables.
Configure a T3 port for network loopback.
Router(config)# controller T3 1/0/0
Router(config-controller)# loopback network
Network loopback loops the T3 line back towards the network and can be used to diagnose problems
with cables from the central switching office to the port.
Configure a T3 port for remote loopback.
Router(config)# controller T3 1/0/0
Router(config-controller)# loopback remote
Remote loopback sends a command to loop the T3 line at the far end (central office). It can be used
to diagnose problems with cables from the port adapter to the switching office.
customer allows a port to respond to loopback commands from remote T3 equipment.
network causes a controller to ignore remote T3 loopback commands.
Cisco 10000 Series Router Line Card Configuaration Guide
Creating a T3, VT, or AUG Controller
6-25