Motorola DDS/MR64, Installation And Operation Manual

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Troubleshooting
6-2 DDS/MR64
•
If REMOTE INITIATED REMOTE TERMINAL appears on the
LCD, remove the Telco cable. If TM LED stops flashing, the
remote unit is in a test configuration. If the TM LED continues
flashing, refer to Chapter 9, Maintenance.
If troubleshooting procedures performed so far have not resolved the
problem, continue.
☞
Note
To use the diagnostic and test features built into the modem,
the Front Panel Option must be strapped EN.
SELF TEST LL/TP
Using the front panel pushbuttons, place the unit in LL/TP. The TEST
PATTERN OK should be displayed. If the TEST PATTERN ERRORS is
continuously displayed, refer to Chapter 9, Maintenance.
END-TO-END TEST TP
Using the front panel pushbuttons, place both local and remote units into
TP. NS and OS LED’s should be off. TEST PATTERN OK should be
displayed. If TEST PATTERN ERRORS is displayed, refer to
Chapter 9, Maintenance.
LOCAL LOOPBACK TEST LL
Using the front panel pushbuttons, place the unit in LL. All data sent
from the local DTE is looped back to itself. This will test the DTE
equipment, cable, interface, and local DDS/MR64. If data is not the
same, refer to Chapter 9, Maintenance. This test is not applicable for
DTE devices without display terminals.
REMOTE LOOPBACK TEST RL
Ensure power is plugged in for both units, timing is set for DDS, and the
remote unit is in DATA mode. Using the front panel pushbuttons, place
the unit in RL. REMOTE LOOPBACK RECEIVED is displayed on the
local unit and REMOTE INITIATED REMOTE TERMINAL is
displayed on the remote unit. The TM LED should be flashing on the
local modem and on the remote modem. All data sent by local DTE
equipment will be looped back through the remote modem. This tests