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Maintenance
4-53160-A2-GB22-10 December 1996
Sending a V.54/ANSI FT1
Activation/Deactivation
To
send a V
.54 or ANSI FT1 Activation or
Deactivation loopback sequence to the far
-end DSU/CSU,
1.
Press F2 to select T
est from the top-level menu
screen.
F1
DS
U E
SF
Stat Test Cnfig
F2
F3
2. From the T
est screen, press F1 to select Rlpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3.
From the Rem Loopback screen, press the
function key that corresponds to the specific
loopback test you want to perform. Use the scroll
keys, if necessary
F1
Rem Loopback:
LLBUP LLBDN 54UP
F2
F3
The
Rem Loop screen appears.
F1
Rem Loop:
Type
Prt1 Prt2 Prt3
F2
F3
The 54UP, 54DN, FT1UP, and FT1DN commands
send the requested sequence out the network
interface on the DS0 channels allocated to the port
you select here.
4.
From the Rem Loop screen, press the desired
function key to select the specific port. Use the
scroll keys, if necessary
.
After you select a port, the sequence is sent to the
far-end DSU/CSU. During this time, Sending
appears on Line 2 of the LCD, followed by
Command Complete
when the sequence is
complete.
During the Sending
message, you can press the
and
keys without af
fecting transmission
of the loopback sequence.
Local Loopback Tests
The Local Loopback tests enable you to conduct circuit
testing and single-ended fault isolation for the digital line.
The supported local loopback tests are:
• Line Loopback (LLB)
• Payload Loopback (PLB)
• DTE Loopback (DLB)
• Repeater Loopback (RLB)
• Data Channel Loopback (DCLB)
• Data Terminal Loopback (DTLB)
The Line Loopback and Payload Loopback commands
can be activated and deactivated in response to commands
received over the network interface as specified by ANSI
and A
T&T standards.
The Network Interface configuration options NET
LLB and NET PLB control whether the DSU/CSU
responds to the commands transmitted on the network
interface to initiate PLBs or LLBs (see Appendix C,
Configuration Options
).
The data port configuration option NET DCLB
controls whether the DSU/CSU responds to inband V.54
or fractional T1 commands to initiate DCLB for that port
(see Appendix C,
Configuration Options
).
Local loopback tests can be aborted (Abort Command)
at any time.
No more than two local loopbacks can be active at any
one time. An additional restriction prohibits certain
loopbacks from running at the same time. Valid loopback
combinations listed in Table 4-2 are identified by YES.