Filter
Top Products
Troubleshooting
6-23
9124-A2-LB20-00
March 2000
Line Loopback
The Line Loopback (LLB) loops the information received on the selected interface
back to the source of the loopback. When used with a pattern test at the remote
node, LLB determines whether the problem is with the sending device or the T1
facility.
Main Menu →Test →Network Physical Tests →Line Loopback
97-15336
The T1
Interface
Other
T1
Interface
LLB
All
1s
Framer
CAUTION:
This test may affect the operation of the frame relay PVCs assigned to
the selected port. While in loopback, the frame relay link will be down
so any IP data being sent while this test is active will be disrupted.
An LLB cannot be started when one of the following tests is active:
H Payload Loopback, Send Remote Line Loopback, or an active Monitor
Pattern on this network interface.
H Repeater Loopback on any other T1 interface with DS0s assigned to this
network interface.
H Send FT1 Loopback or Data Channel Loopback on the synchronous
data port.