Running Equipment Loopbacks - Cisco 10000 Series Configuration Manual

Chapter 4 4-Port Channelized T3 Half-Height Line Card Configuration
For more information on the loopback command, refer to the online
Troubleshooting
Examples:
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Note

Running Equipment Loopbacks

Use the equipment loopback command to run loopbacks in conjunction with remote equipment.
[no] equipment
Where:
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Use the no form of the command to terminate the loopback.
For more information on the loopback command, refer to the online
Troubleshooting
In the following example, an equipment network loopback is configured:
Router(config)# controller T3 1/0/0
Router(config-controller)# equipment network loopback
Channel-Group Command for DS0 Time Slots and T1s
Each channelized T3 consists of 28 T1s, each of which is divided into 24 time slots (or DS0s). To create
an interface that supports subscriber traffic, you must combine the time slots into channel groups. Use
the t1 channel-group command to create a channel group.
Channel groups have these characteristics:
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OL-8834-04
Guide.
Configure the T3 controller for local loopback.
Router(config)# controller T3 1/0/0
Router(config-controller)# loopback local
Configure the T3 controller for remote loopback.
Router(config)# controller T3 1/0/0
Router(config-controller)# framing c-bit
Router(config-controller)# loopback remote
Remote loopback works only when framing is set to c-bit.
[ |
customer network
customer enables the line card to respond to remote T3 loopback commands from the remote T3
equipment.
network causes the line card to ignore remote T3 loopback commands.
Guide.
A channel group is an interface.
A channel group can be one time slot to 24 time slots in size.
A channel group that consists of 24 time slots is a T1 interface.
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A channel group that consists of fewer than 24 time slots can be described as a fractional T1
–
interface.
Each group of 24 time slots can be divided into multiple fractional T1 interfaces.
A channel group cannot be part of more than one T1.
Channel-Group Command for DS0 Time Slots and T1s
]
loopback
Cisco 10000 Series Router Line Card Configuaration Guide
Cisco 10000 Series Internet Router
Cisco 10000 Series Internet Router
4-17