User Manual

OPTICAL MASTER UNIT
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd 15
Either a separate antenna is connected to the modem antenna port, or the connection is be made via a
coupler connected to the RF input to the OMU. The latter alternative can only be used if the OMU
runs on the same frequency as the wireless modem and is equipped with a duplex filter.
2.4.5.1 OMUs without Duplex Filter
OMUs that are not equipped with a duplex filter and use a
wireless modem has a modem antenna port to the rightmost
side of the rack.
An external antenna can be connected to the “Modem Ant”
port.
The connector is SMA type.
2.4.5.2 OMU with Duplex Filter
OMUs that are equipped with duplex filters and a wireless modem are of two kinds:
Alternative 1
The OMU and the wireless modem
operate on the same band (for example an
OMU for GSM with a GSM modem).
In this case the OMU will have two ports
with a link between them.
 If the link is in place the modem will be
connected to the OMU’s RF in/out via a
coupler. The coupler is either a separate
unit or included in the duplex filter.
 If the link is removed an external
antenna can be connected to the top
connector.
Alternative 2
Modem
ANT
To external
antenna
Coupler
Modem
ANT
To external
antenna
Coupler
Modem
ANT
To external
antenna
Coupler
Modem
ANT
Coupler
Modem
ANT
The wireless
modem is
linked to the
RF in/out via
a coupler
An external
antenna is
connected