Справочник Пользователя для ADC Telecommunications Inc. DVLRCS800
ADCP-75-124 • Issue B • April 2002 • Section 5: Maintenance
Page 5-11
©
2002, ADC Telecommunications, Inc.
4
TEST PROCEDURES
This
section provides procedures for common troubleshooting and maintenance tests. Refer to
these
procedures as needed when specified in the Fault Isolation and Troubleshooting tables in
.
4.1
Optical Power Test
A
break in an optical fiber or a fault with the optical connector will interrupt communications
between
linked components or generate excessive errors. Use the following procedure to isolate
a
problem with an optical fiber or connector.
1. Put
on the IR filtering safety glasses.
2. Notify
the NOC or alarm monitoring system operator that the system is going offline.
3. At
the HU and at the STM, place the On/Off switch in the OFF position (press O).
4. Disconnect
the optical fiber connectors for the fiber to be tested at the HU and at the STM.
5. Inspect
the optical connectors. Verify that each connector is clean and that no scratches or
imperfections
are visible on the fiber end. Clean and polish the optical connector if
necessary.
6. Connect
a laser light source to one end of the optical fiber and an optical power meter to
the
other end.
Alarm Type
LED
Color
Major
SHUTDOWN
Red
PROBLEM: The RF output from the LPA is shutdown.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.The
RF ON/OFF switch is in the OFF position
or the LPA was set in the disable mode through
the EMS computer.
2.
2.
Breaker switch on LPA is open
3.
The LPA is faulty.
1.Place
RF ON/OFF switch in the ON position or
enable the LPA.
2.
Reset breaker switch.
3.
Replace LPA.
Danger:
This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser radiation
can
seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not
look
directly into the optical transmitter of any unit or exposure to laser radiation may result.
An
optical power meter should be used to verify active fibers. A protective cap or hood MUST
be
immediately placed over any radiating transmitter or optical fiber connector to avoid the
potential
of dangerous amounts of radiation exposure. This practice also prevents dirt particles
from
entering the connector.
Table 5-8. STM and LPA Fault Isolation and Troubleshooting, continued