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CHAPTER 5: Troubleshooting
Fig. 5-1. Local analog loopback.
4. If you use a BERT unit and it indicates an error, make sure the cables
connecting it to the A/S2W SHM are securely connected. If they are, try
swapping in known-good cables. If the error goes away, the problem was
probably in the old cables. Otherwise, the A/S2W SHM is probably faulty; call
Black Box for technical support.
If you use a BERT unit and it indicates all clear, but you get errors when
you perform the DTE test, the DTE is probably the source of the problem.
Make sure that it is physically intact and that it is configured correctly. Refer
to your DTE’s manual if necessary, and if you can’t solve the problem, call
your DTE’s supplier.
If you don’t have a BERT unit, and the DTE test indicates an error, make
sure the cables connecting the DTE to the A/S2W SHM are securely
connected. If they are, try swapping in known-good cables. If the error goes
away, the problem was probably in the old cables. Otherwise, the DTE is
probably the source of the problem. Make sure that it is physically intact and
that it is configured correctly. Refer to your DTE’s manual if necessary, and if
you can’t solve the problem, call your DTE’s supplier.
5. After completing the test (or when the fault has been corrected), return the
ANA button to the OFF position by pushing it again or, if you’re controlling
the test electronically, lower the LL signal from the DTE to the unit.
6. Repeat Steps 1 through 5 at the remote site.
Proceed with the Remote Digital Loopback test.
DATA
TERMINAL
CLK
DATA
DATA
CLK
XMTR
RCVR
LINE
Summary of Contents for ME375A-R2
Page 33: ...NOTES...
