User Manual

MBF, Multi Band Repeater
PRODUCT DESCRIPTION AND USER'S MANUAL
© Axell Wireless Ltd A 200 93 00, rev E 20 (105)
3 Product and System Description
3.1 Overview
The MBF family of repeaters include band selective, fibre fed repeaters with one, two or three bands
integrated into one repeater box. The repeaters are named MBF (Multi Band Fibre) with an extension that
defines the number of bands and the type of band. The number of bands is indicated by a letter where “S”
stands for single band, “D” for dual band and “T” for tri band. The frequencies covered are indicated by
numbers where “7” stands for 700MHz, “8” stands for 850MHz, “9” for 900 MHz, “18” for 1800MHz, “19”
for 1900 MHz, “22” for 2100MHz and “17” for the AWS band.
The MBF repeater is a systems component and needs to be fed from an Optical Master Unit, OMU. Each
OMU can be equipped with up to 6 fibre optic converters. Several OMUs can also be cascaded to form more
extensive repeater systems.
RF
MBF
Repeater
Opto Fiber
RF
FiberOptic
Converters
Server
Antenna
From BTS
via coupler
OMU
Standard OMU-Repeater application where one OMU is used
In a standard OMU-Repeater application as illustrated above, the input signal to the system is tapped off a
base station via a directional coupler. In the OMU the RF signal is converted into an analogue optical signal
and transported via optic fibre to the fibre fed repeater MBF. The repeater converts the optical signal back
into an RF signal which is then amplified and transmitted via a server antenna. In the uplink direction the
OMU receives the signal from the repeater via the fibre optical cable, converts it to an RF signal and sends it
back to the base station via the coupler. The OMU-Repeater system can also be fed from one a repeater. In
this case the signal is tapped from the repeater’s server antenna port. The repeater in its turn can be linked to
an antenna that picks up the signal off air.
An MBF repeater with more that one band can be equipped with one fibre optic converter which is shared
between the bands or have one converter for each band. Below are the two options exemplified.
BTS 1
BTS 2
BTS 3
Tri band repeater with three
fibre optic converters
Server
Antenna
A tri
band repeater with three fibre optic converters fed by three OMUs