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Performing Loopback Tests 141
Performing a Local
Loopback Test on the
T1/FT1 Port
(46x and 56x)
This section describes how to perform a local line or payload loopback
test using the loopback plug on the T1/FT1port on the model 46x and
56x bridge/router.
Figure 13 shows the data flow that occurs when this loopback test is
performed.
Figure 13 T1/FT1 Local Loopback Testing
Before running the T1/FT1 loopback test, attach a console or Telnet to
your bridge/router.
To perform a local loopback test on the T1/FT1, follow these steps:
1 Uncable the WAN port and insert the loopback plug that came with your
system.
2 Disable the WAN path by entering:
SETDefault !3 -PATH CONTrol = Disable
3 Set the owner of the WAN port to loopback by entering:
SETDefault !3 -PORT OWNer = LoopBack
4 Start the loopback test by entering:
LPBCK !3 -PATH LclLnLpbckSTART (for a line loopback test)
or
LPBCK !3 -PATH LclPyldLpbckSTART (for a payload loopback test)
If the number of received packets equals or approximately equals the
number of transmitted packets, your line has passed the loopback test. If
your line does not pass the test, verify that the software is configured
correctly. Stop the loopback test by entering:
LPBCK !3 -PATH LclLnLpbckSTOP (for a line loopback test)
or
LPBCK !3 -PATH LclPyldLpbckSTOP (for a payload loopback test)
T1/FT1 port
with loopback plug