User Manual

AXELL MBF MULI-BAND FIBRE REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
30 © Axell Wireless Ltd
Configure the
downlink
Lower the attenuation level step by step until the desired output power level is
reached. In this example +33 dBm. Zero attenuation is the same as maximum gain.
Note! Please also consult the OMU User’s Manual.
Initiate a fibre loss
elimination
This is done from the OMU by sending a pilot tone to the repeater and calculating the
loss in the fibre link. This loss is compensated for automatically. The system will
behave as if there is no loss at all in the fibre link.
Configure the
uplink
In the uplink direction the attenuation needs to be set based on a measurement of a
known signal which is transmitted through the repeater and the OMU as well as the
fibre. There are two ways of performing this measurement.
Alternative 1
Use a signal generator to insert a signal of approximately -70dBm into the repeater’s
server antenna port. Measure the signal level on the BTS or on the coupler and adjust
the attenuation so that the total gain in the uplink is close to 0dB. (At 0dB gain the
signal level at the coupler should be -40dBm and on the BTS -70dBm in this
example.)
Alternative 2
Use a signal generator to insert a signal of approximately -70dBm into the repeater’s
server antenna port. Log into the OMU and monitor the uplink via the RMC. This
measurement is not as accurate as alternative 1.
Note! If several repeaters are connected to the same OMU the total gain in each
chain should be slightly lower than 0dB not to insert too much noise into the BTS.
Note!
For in-depth instructions for commissioning of an OMU-Repeater system please
contact your Axell Wireless representative.
ON
-19.0dBm
33dBm
Repeater
Signal
Generator
Fiber
-70dBm
BTS
-30dB
Coupler
OMU
-40dBm
-70dBm
Alternative 2: Use the RMC to
measure the uplink at the OMU