User Manual

MBF, Multi Band Repeater
PRODUCT DESCRIPTION AND USER'S MANUAL
© Axell Wireless Ltd A 200 93 00, rev E 28 (105)
3.6.1.1 Modem
The repeater can be equipped with a wireless modem or a PSTN modem for remote control and supervision.
Different wireless modem types are supported – GSM, EDGE, GPRS, TETRA, etc. If the repeater is
equipped with a wireless modem a SIM card holder is mounted on the Control Module.
The repeater can also be accessed via Ethernet.
Wireless modems are placed on the Control Module inside the repeater. A PSTN modem is placed in a
separate module within the repeater.
3.6.2 MCPA, Multi Carrier Power Amplifier
There is one MCPA for each band in the repeater.
3.6.3 Radio Module
There is one Radio Module for each band in the repeater. These are RF boards containing two RF-chains, one
uplink and one downlink.
3.6.4 Fibre Optic Converter
A single band MBF repeater has only one Fibre Optic Converter. A dual or tri band repeater can have one,
two or three converters depending on the mixture of frequency bands and the requirements on the system.
The Fibre Optic Converters contain both a receiver and a transmitter. The two optical signals are combined
utilizing WDM technology (Wavelength Division Multiplexing). Hence only one fibre is necessary for
transmission. The module also contains a function for the internal communication over the fibre.
The Fibre Optic Modules work in pairs in the system – one in the OMU and one in the repeater. The one
placed in the OMU is the master (Optical Master Unit) and the one placed in the repeater is the slave (Optical
Slave Unit).
The Fibre Optic Converter has a pilot tone generator that is used for detecting the optical path loss in the
fibre. This information can be used for compensation of this loss. Optical loss compensation is always
initiated from the Optical Master Unit. In the Optical Slave Unit the pilot tone is normally disabled, and only
enabled upon request (from for example the Optical Master Unit).
The Fibre Optic Converter contains two optical alarm sources. These are alarms for transmitted and received
optical signal level. The levels of the received optical signals can be monitored on-line via the RMC. This is
convenient during installation and tuning of the system. The module also has two alarm sources for the
communication between the master and the slave.
There are 6 LEDs on the
module to indicate the
status.
P
W
R
E
R
R
U
L
D
a
ta
D
L
D
a
ta
O
p
to
R
x
O
p
to
T
x
LED 1, Power, Green
On Unit is powered on
Off Unit has no power
LED 2, Error, Red
On Error detected
Off No error
LED 3, UL Data, Yellow
On Communication is ongoing in the uplink direction