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CHAPTER 5: Diagnostics and Troubleshooting
Table 5-1 (continued). Troubleshooting chart.
Trouble Symptoms
Probable Cause
Corrective Measures
TEST LOC indicator
The unit is in the
Set the TEST switch to the
is On.
local-loopback mode. NORM position.
TEST REM indicator.
The unit is in the
Set the TEST switch to the
remote-loopback
NORM position.
mode.
5.4 Calling Black Box
If you determine that your T3 Fiber Optic Line Driver is malfunctioning, do not
attempt to alter or repair the unit. It contains no user-serviceable parts. Contact
Black Box at 724-746-5500.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete description,
including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used, appears to create the problem or
make it worse.
5.5 Shipping and Packaging
If you need to transport or ship your T3 Fiber Optic Line Driver:
• Package it carefully. We recommend that you use the original container.
• If you are shipping the T3 Fiber Optic Line Driver for repair, make sure you
include everything that came in the original package. Before you ship, contact
Black Box to get a Return Authorization (RA) number.
