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Troubleshooting New Installs
Before initiating diagnostics on a newly installed unit and/or DDS circuit
and before contacting ADTRAN Technical Support, please check the items
in Table 11-2 to ensure the unit is configured properly.
Configuration
Item to Check
DTE Type
Loop Rate
Data Format
DTE Cable
Telco Cable
Power the unit Off
and then On.
After verifying the items listed in Table 11-2, the unit should operate prop-
erly and display the following:
DATA MODE
LOOP IS NORMAL
If a status message other than DATA MODE LOOP IS NORMAL is shown,
begin performing diagnostics described in the following section.
61200270L1-20
Table 11-2. Troubleshooting New Installs
Option Selection
EIA-232 or V.35
Auto, 2.4 to 64 kbps From the CONFIG menu,
Async or Sync
N/A
N/A
N/A
DSU III ARdc User Manual
Chapter 11. Testing and Troubleshooting
Action
From the CONFIG menu,
select the type of DTE
interface option to connect to
the DSU/CSU.
select the DDS loop rate of
the DDS circuit.
From the CONFIG menu,
select the type of data to be
used.
Verify DTE cable connection
to the proper DTE connector
on the DSU/CSU.
Verify the telco cable is
securely connected to the
DSU/CSU and wall jack.
Verify the unit passes self test
during power-up (displayed
on the LCD).
11-7
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Table of Contents
Troubleshooting
