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DataTalker Owner’s Manual
7.4 Troubleshooting Guide
This troubleshooting guide is designed to help you pinpoint the cause of your problem and
correct it as quickly as possible. Because equipment from different manufacturers is typically
involved in multiplexer networks, you may encounter “finger pointing” as to who is at fault. Who is
at fault is not as important as getting you back on line as soon as possible. The intent of this
guide is to indicate the most probable causes of specific error conditions, but, since similar
conditions may have different causes, please keep in mind that this is a guide, not a cookbook,
and you must use your best judgement.
For purposes of troubleshooting, you can divide your mux network into three main parts:
Data Channel
• Sync/async channel device (printer, terminal, PC, etc.)
• Channel communications (RS232 cabling, modems, etc.)
Voice/Fax Channel
• Telephones and fax machines
• Station side of PBX
• E&M trunk of PBX (channel 1 only)
Composite Link
• Digital composite link communications line with internal or external DSU or ISDN terminal
adapter
• Internal/external link modem
• Composite link communications line (4-wire non-loaded metallic wire for DSU or 2-wire or 4-
wire lease line or dial-up line for internal or external modem)
Once you have found the probable cause of your problem, refer to the specific manual chapter
for additional help, or contact Multi-Tech Technical Support (see Chapter 8).