12
SHM-NPR
4. Troubleshooting
4.1 If You Have Difficulty
If your SHM-NPR or SHM-NPR/RJ system does not seem to be operating properly,
here are a few things to check first:
1. Is the DCE/DTE switch set correctly on each of the short-haul modems? If the
attached device is a DTE (computer, PC, terminal, printer, etc.), this switch
should be set to DCE; if the attached device is a DCE (modem, etc.), this
switch should be set to DTE. See also
Section 3.1
.
2. Check all external connections. Make sure they are firm and secure.
3.
SHM-NPR (ME721) only:
Detach the unit from the device and open its case.
Make sure that none of the wires have come loose from the terminal block.
4. Use a cable tester to test the cable for continuity and pinning.
If you still can’t determine what is causing the problem, call Black Box
Technical Support as described in the next section.
4.2 Calling Black Box
If you determine that your SHM-NPR or SHM-NPR/RJ is malfunctioning,
do not
attempt to alter or repair the unit
. It contains no user-serviceable parts. Contact Black
Box Technical Support at 724-746-5500.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete description,
including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used,
appears to create the problem or make it worse.
• the results of any testing you’ve already done.
Summary of Contents for SHM-NPR
Page 17: ...NOTES...
