
Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-12 Troubleshooting ASM-40CD Ver. 1.0
Start
Set local ASM-40CD
to LLB
OK?
OK?
Local DTE
and modem clock
types match?
Local modem
‘No Interface’
alarm On?
Local DTE
to modem connection
OK?
1
Yes
Install a legal
digital interface
card
Yes
Failure in local
digital interface.
Repair/replace
digital interface.
Failure in
local modem.
Repair/replace modem.
Yes
Set local ASM-40CD
to LLB + BERT
Match DTE and
modem clock
types
Repair DTE-modem
connection
No
No
No
No
Yes
No
Yes
Figure 4-7. Troubleshooting Flowchart using V.54 Loopbacks
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