Fujitsu FLM 150 ADM Maintenance And Trouble Clearing page 176

Maintenance and Trouble Clearing
FJTU-320-515-480
Step 8 If the optical input power is more than –8 dBm, insert a 10- or 15-dB fixed
attenuator between the lightwave distribution frame (LDF) and the optical fiber
input cord. Select the amount of attenuation so that input power is between –8
and –28 dBm.
Note: The following are the suggested fixed optical attenuators:
– 10-dB attenuator: H72M-2032-L002
– 15-dB attenuator: H72M-2032-L004
Note: If the optical receiving power is between –3 and –8 dBm, a 10-dB attenuator should
be inserted. If it is more than –3 dBm, a 15 -dB attenuator should be used.
Step 9 If optical input power is less than –28 dBm on the MR units, or less than –34 dBm
on the LR units, perform the following steps one at a time until required input
power is measured.
Step 10 Disconnect transmission path fiber from power meter; then reconnect the fiber to
the power meter. (A slight alignment change may affect the reading.)
a. Clean optical connectors on both the fiber cord and test equipment. Repeat
Steps 4 through 7.
b. Test (or replace, if required) HC1A/MC6A units at the opposite terminal.
Repeat Steps 4 through 7.
Step 11 When the power reading is correct, disconnect optical power and reconnect the
fiber optic cord to the HC1A/MC6A unit.
Reinstall the unit.
Step 12
You have completed this procedure.
Issue 9, May 1999 FNC and FNC Customer Use Only
5.3: Measuring Optical Power
Vol. ll, Page 480.5-14