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CHAPTER 6: Troubleshooting
The following information will help you trouble-
shoot your installation if problems develop. If your
particular situation isn’t listed here, call Black Box
for assistance. Have ready a description of the
problem with your installation, your DTE equipment
make and models, your equipment’s DTE/DCE
configuration and flow control type (hardware or
software), your EIA-232 cable pinouts, and what
(if anything) you have already done to correct
the situation.
SYMPTOM: No data transfer in one or both directions (to, from,
or to and from the High Speed SHM-B Async).
1. Monitor the TD LED on the sending-end
modem while you send some data. The light
should flash with data. If not, check the
DCE/DTE jumper on that unit. Once you get
a TD LED flashing on that unit, the RD LED
should flash simultaneously on the other High
Speed SHM-B Async unit. If not, go to step 2.
2. Inspect the wiring between the two modems.
Have the wires been properly installed?
Tr (TX+) on one modem must be
wired to R (RX+) on the other modem;
6. Troubleshooting
