Bird Technologies Manual 7-9570-1-1
(Rough Draft)
08/19/16 Page 16
ule has several RF connectors on the front panel
and contains either duplex filters and combined DL/
UL ports or separate uplink/downlink paths which
can be chosen for connection to the base station
depending on system requirements. In most cases
the duplexed version with a combined DL/UL port
is used. Refer to
Figure 10
.
FUNCTIONAL DESCRIPTION
In the duplexed version there are UL test connec-
tors present (SMA) that can be used to monitor the
signal out from the BIU. The version without duplex
filters has the test connectors replaced by UL con-
nectors and the normally combined DL/UL connec-
tors are replaced by DL only connectors.
There are two separate RF channels and associ-
ated RF ports in a BIU (channel 1 and channel 2).
Each channel contains a downlink and an uplink
path. The two RF paths in the BIU cannot have dif-
ferent frequency bands. As an example a GSM 900
BIU will have two GSM 900 paths. If you wanted an
1800 path in the system it would require adding a
second BIU module to the master frame unit. Note:
BIU Modules need to be ordered for the specific
frequency bands that they will serve.
The BIU has four QMA type (female) ports that are
normally used to connect it to the Point of Intercon-
nect (POI) Module. There are two uplink (input)
ports and two downlink (output) ports. The isolation
between DL1 and DL2 as well as between UL1 and
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
Slot 7
Slot 8
Slot 9
Slot 1
0
Slot 1
1
Slot 1
2
Slot 1
3
Slot 1
4
Slot 1
5
Slot 1
6
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
LAN
BIU
Module
BIU
Module
FOI
Mod
u
le
Power
Supply
Module
FOI
Mod
u
le
DC Out
AC In
120
VAC
(Back plane)
Master Frame Unit
POI Module
Figure 9:
Typical Master Unit. In this example 2 BIU’s, 2 FOI’s and a Power Supply are each plugged
into the backplane of a master frame unit. A single POI is not plugged into the backplane but is
installed into the rack as part of the Master Unit.
