User's Manual

Fiber Optics Powerwave

6 - 4 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual

Figure 6-3. Slave unit downlink path, and uplink path

10. Switch the FOR on and wait until it is in operational mode.

11. Connect an O&M software to the FON board.

12. Measure the optical downlink input power (’RX’ in Figure 6-3). The receiver level

is measured via the O&M software (FON status).

Write down the measured optical power value.

13. Calculate the optical power loss from the TX port of the master FON board

(step 5) to the RX port of the FOR/slave unit (step 12).

The loss includes fibers, WDMs, splitters, and connectors used in the current

configuration.

The calculated optical loss should not exceed 15dB.

Write down the calculated optical loss value.

14. Set the receiver attenuation (RX Att.) via the O&M software (FON configuration).

An approximate receiver attenuation value can be set according to the calculated

loss over the fiber in step 13. Choose value from the table.

15. Move the O&M software from the FON board to the repeater and set the desired

repeater bandwidth and downlink gain.

16. Move the O&M software back to the FON board and set the transmitter

attenuation (TX Att.) to a calculated value that gives the following optical

transmitter an input power of approximately 0dBm.

17. Choose optical transmitter output power range via the O&M software as described

in step 6.

FON

FOR

BMU

FON

RX Att.

BTS

RX Att.RX

TX Att.

0dBm

dBm

TXRX

TX RX

Optical loss over fiber Receiver attenuation

10dB 10dB

!10dB 5dB