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2 POTS, 2 GigE ONT Installation and Maintenance Practice
Troubleshooting
Two principles should be kept in mind when troubleshooting an ONT unit:
• Because voice and data signals originate at the OLT equipment, a failure of all services
normally indicates the problem is before the ONT. A failure at the OLT equipment normally
results in a loss of service to multiple customers.
• The OLT has diagnostic testing equipment that can monitor the status of every ONT in the
system, which very often can direct you to the root cause of the trouble.
This section describes how to troubleshoot and correct the following:
•
"Faults Indicated with LEDs"
•
"ONT Trouble Isolation"
•
"ODN Interface Troubleshooting"
•
"UPS Communication Signals"
Do not look into the ends of optical fibers. Exposure to invisible
LASER radiation may cause serious retinal damage or even
blindness. Verify the optical source is disabled through the use of
an optical power meter before handling optical fibers.
This equipment must be connected to a known good earth ground
at all times during service. Refer to the National Electrical Code
(NEC) and state/local codes for details on grounding requirements.
Faults Indicated with LEDs
Begin troubleshooting at the ONT by checking to see if all LEDs are in their normal state,
shown in
Table 4
on page 42. There are separate LEDs for each Ethernet RJ45 jack that
appear on the SFU circuit board. If the LEDs are in their normal state, refer to
Normal State"
on page 44. If the LEDs are in a fault state, refer to
page 45.
LEDs in Normal State
If the LEDs are in the normal state but you are still having problems, perform the following
troubleshooting steps:
1. If the trouble is of a random or intermittent nature, check for loose or broken connections
at the common mounting platform.
2. If the trouble is solid, remove the CPE wiring and perform the following test:
• Ethernet tests described in
verify the OLT can run and pass the loop-back tests for the Ethernet port.
44
on page 44
on page 45
on page 51
on page 55
WARNING
WARNING
"Provision Ethernet Interface at OLT"
"LEDs in
"LEDs in Fault State"
on page 43. Diagonally,
61187602G2-5A
on
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Table of Contents
Troubleshooting
