User's Manual Part 2
Table Of Contents
- SECTION 3: OPERATION
- 1 BEFORE STARTING OPERATION
- 2 TURN-UP SYSTEM AND VERIFY OPERATION
- 2.1 Reference Procedure: Determine Forward Path Input Signal Level
- 2.2 Reference Procedure: Enter Site Name and Site Number
- 2.3 Reference Procedure: Enter Host Forward Attenuation
- 2.4 Reference Procedure: Determine Output Signal Level at RU Antenna Port
- 2.5 Reference Procedure: Enter Remote Forward Attenuation
- 2.6 Reference Procedure: Enter Host Reverse Attenuation
- 2.7 Reference Procedure: Enter Host Forward and Reverse Delay
- SECTION 4: MAINTENANCE
- SECTION 5: GENERAL INFORMATION
ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 4: MAINTENANCE
Page 4-13
© 2005, ADC Telecommunications, Inc.
15. If the transmitting unit is the HU, place the On/Off switch in the OFF position (press O).
If the transmitting unit is the RU, open (turn off) the AC circuit breaker switch.
16. Disconnect the optical power meter from the receiver end of the optical fiber.
17. Reconnect the optical fibers to the receiving HU or RU.
18. Repeat steps 3 through 17 for each optical fiber that requires testing.
19. When ready to put the system back into service, place the On/Off switch on the HU in the
ON position (press I) and close (turn on) the AC circuit breaker switch for the RU.
20. Notify the NOC or alarm monitoring service that the system is going back online.
4.2 Optical Loopback Test
The following procedure provides a test to determine if an optical port fault exists with the Host
Unit.
1. Put on the IR filtering safety glasses.
2. Notify the NOC or alarm monitoring system operator that the system is going offline.
3. Place the On/Off switch in the OFF position (press O).
4. Disconnect the optical fiber connectors from the FWD (PORT 1) and REV (PORT 2)
optical ports and place a dust cap over each connector.
5. Plug a 15 dB in-line optical attenuator into the FWD (PORT 1) optical port as shown in
Figure 4-4.
6. Connect a 1 meter patch cord between the optical attenuator and the REV (PORT 2)
optical port.
7. Place the On/Off switch in the ON position (press I).
Note: Because the RU is equipped with a WDM, the optical loopback test cannot be
performed on the RU.
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.
Caution: The optical receiver can be damaged if the power level of the optical input signal is
too high. To avoid damaging the optical receiver when performing the loopback test, always
install a 15 dB in-line attenuator in the optical receiver circuit.