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JunosE 11.3.x Physical Layer Configuration Guide
Enabling Remote Loopback
equipment loopback
62
You can enable remote loopback capability on frame-based T3 interfaces configured to
use C-bit framing. Remote loopback is not supported on E3 ATM, E3 FRAME, and T3 ATM
interfaces.
For a list of the modules that support remote loopback, see ERX Module Guide, Appendix
A, Module Protocol Support.
To enable remote loopback:
Change the clock source to internal.
1.
host1(config-controll)#clock source internal module
Ensure that the line is configured to use C-bit framing, which is the default for
2.
frame-based T3 interfaces.
host1(config-controll)#framing c-bit
Configure one of the following loopback tests:
3.
Set the loopback to remote to request that a remote device connected on a T3
interface enter into a loopback.
host1(config-controll)#loopback remote
Configure the T3 interface to enable or disable the ability to enter into a loopback
initiated by a remote device, as follows:
Issue the equipment customer loopback command to enable the router to enter
into loopback when it receives an appropriate signal from the remote device.
host1(config-controll)#equipment customer loopback
Issue the equipment network loopback command to disable the ability to enter
into loopback initiated by a remote device.
host1(config-controll)#equipment network loopback
Use to enable or disable the router's ability to enter into a loopback initiated by a remote
device connected on a T3 interface.
NOTE: Remote loopback is available only on frame-based T3 interfaces
configured to use C-bit framing.
Specify one of the following loopback options:
customer—Enables the router to enter into loopback when it receives an appropriate
signal from the remote interface
network—Disables the router's ability to enter into loopback when it receives an
appropriate signal from the remote interface
Copyright © 2010, Juniper Networks, Inc.
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