User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 67 (86)
Select “HUB Status”
Seet the attenuation in
the downlink in this
box.
The level in position F
can be monitored in
the RMC
Fiber Loss Compensation
Activate the fibre loss compensation in both the downlink (from the OMU) and in the uplink (from the
repeaters) paths. See
4.10 Initiate Fibre Loss Compensation.
Uplink Path
In the uplink direction the system should be transparent, i.e. the signal level on the BTS input connector should
be the same as the level on the repeater input connector.
Example
We assume an input level to the repeater of -70dBm
h = -70dB
The repeater gain is set to 57dB => g = -13
The loss in the fibre is 20dB RF (10dBo) => f = -33
The loss in the splitter and the duplex filter 9dB => c = -42
A 30dB directional coupler is used => a = -72
A level of -72 at the BTS is OK. If this level needs to be reduced the attenuator in the combiner can be set to
max 21 dB in 3 dB steps
Select “HUB Status”
Seet the attenuation in
the uplink in this box.