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Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
ASM-40CD Ver. 1.0 Troubleshooting 4-11
Table 4-5. Troubleshooting Using Alarm Messages
Symptom – ERR LED is On Basis for Malfunction Corrective Action
SYNC LOSS alarm is stored in
the Alarm Buffer
The line between the
modems is not properly
connected
Verify and connect the line properly
Verify that the remote modem works with
the same bit rate
Verify that the CARR is On or RTS is On
NVRAM FAILED alarm is stored in
the Alarm Buffer
Hardware failure Replace the unit
INTERFACE alarm is stored in the
Alarm Buffer
No digital interface, or a
digital interface which is
not supported by modem
Connect a DTE interface which is supported
by the modem
ILLEGAL EXT CLK alarm is stored
in the Alarm Buffer
There is no external clock,
or the external clock
frequency is not
supported by the modem
Verify that an external clock is connected to
the modem and its frequency is supported
by the modem
XILINX FAILED alarm is stored in
the Alarm Buffer
ASM-40CD hardware
failure
Replace the unit
Using Loopbacks for Troubleshooting
To solve a system transmission problem, set V.54 loopback connections and
check Alarm Buffer messages (see
Section 4.5
) in the sequence shown in
Figure 4-7, Figure 4-8,
and
Figure 4-9
.
Loopback tests are described in
Section
4.1
.
After completing the test or correcting the fault, deactivate the loopback. Notice
that the TEST LED turns off. Deactivate a loopback before setting another
loopback.
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