User Manual

Table Of Contents
Optical Master Unit
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd A1829300 rev H 23 (86)
2.2.8 Modem Antenna Connection
If a wireless modem is installed din the OMU, an antenna is needed. 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.
2.2.8.1 OMU 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.
Modem
ANT
To external
antenna
2.2.8.2 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.
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