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 4-12
© 2005, ADC Telecommunications, Inc.
7. Connect the input (transmitter) end of the optical fiber to the transmitting HU or RU.
8. If the transmitting unit is the HU, place the On/Off switch in the ON position (press I). If
the transmitting unit is the RU, close (turn on) the AC circuit breaker switch.
9. Using the transmitting HU or RU as an optical light source, measure the optical power at
the receiver end of the optical fiber. The power level of the optical signal received at the
HU or RU should be –15 to –25 dBm (with attenuator installed). If the power level of the
received optical signal is within this range, the optical fiber and the far end unit are good.
If the power level of the signal is greater than –15 dBm, insert additional attenuation to
bring the signal level within the specified range. If the power level is less than –25 dBm,
the value of the external attenuator is too high, the optical fiber is faulty, or the far end unit
optical transmitter is faulty. Continue with test procedure to isolate the problem
10. 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.
11. Disconnect the optical power meter from the receiver end of the optical fiber.
12. Use a 1 meter patch cord to connect the optical power meter to the transmitting HU or
RU as shown in Figure 4-3.
Figure 4-3. Host Unit and Remote Unit Optical Transmitter Test Set Up
13. If the transmitting unit is the HU, place the On/Off switch in the ON position (press I). If
the transmitting unit is the RU, close (turn on) the AC circuit breaker switch.
14. Measure the optical output power of the transmitting HU or RU. The power level of the
optical output signal from the HU or RU must meet the following specification:
Forward Path Signal at the HU: 0 +
1 dBm
Reverse Path Signal at the RU: +1.3 +
1 dBm
If the power level of the optical output signal is within specifications with a 1 meter patch
cord installed, the fiber optic link is faulty. If the power level of the optical signal is not
within specifications, the far end HU or RU optical transmitter is faulty.
Caution: Erratic operation may occur with an optical input signal level of –13 dBm or higher.
If the optical input signal level exceeds –9 dBm, the optical receiver may be damaged.
HOST UNIT
REMOTE UNIT
+1.3 +/- 1 dBm
0 +/- 1 dBm
HOST UNIT OPTICAL TRANSMITTER
TEST SET UP
REMOTE UNIT OPTICAL TRANSMITTER
TEST SET UP
1 METER PATCH CORD
1 METER PATCH CORD
20980-A
FWD
(PORT 1)
REV
(PORT 2)
BAND 2 BAND 1
OPTICAL POWER
METER
OPTICAL POWER
METER
SEE TAG ON PORT TO IDENTIFY SYSTEM