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9-23
9161-A2-GH30-30
April 1998
Line Loopback
The Line Loopback (LLB) loops the information received on the Network or
DSX-1 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.
496-15197
Network
Interface
DSX
Port
All 1s
LLB
DCE
Port 1
DCE
Port 2
All 1s
All
1s
Framer
The following tests cannot be running when a line loopback test is initiated:
H Payload loopback on this Network or DSX-1 interface
H Send Pattern Test on this Network or DSX-1 interface or any data port
assigned to this interface
H Send Remote Line Loopback on this Network or DSX-1 interface
H Send V.54 or Send FT1 Loopback on any port assigned to this Network or
DSX-1 interface
H Data Channel Loopback on any data port assigned to this Network or DSX-1
interface
CAUTION:
Line Loopback may affect the operation of the FDL, DDL, or EDL. Any IP
data being sent while this test is active will be disrupted. Also, any
performance statistics being sent over the EDL will be disrupted.