Bird Technologies Manual 7-9570-1-1
(Rough Draft)
08/19/16 Page 15
modules that are inser ted into the rack frame
depending on the specific system design. Gener-
ally all Master Units will contain a master frame
unit, a power supply, at least one Base Station
Interface Unit (BIU), an RF splitter/combiner unit
called the Point of Interconnect (POI) and a mini-
mum of one Fiber Optic Interface card (FOI). A
block diagram of the typical Master Unit is shown in
Figure 9
.
The Master Frame Unit
The master frame unit houses some of the mod-
ules in a master unit including the power supply
modules, fiber optic interface modules, and base
station interface modules. Modules can be placed
anywhere in the master frame unit and any combi-
nation of modules can be mixed. There are 16 slot
positions for modules in the master frame. Each
type of module placed into the master frame uses a
different amount of slot positions. Power supply
modules use 4 slot positions, BIU’s use 2 slot posi-
tions, and FOI’s use one slot position. In very large
systems multiple master frame units can be used
to house a multitude of modules as required. In the
example shown in figure 1 the Master Frame Unit
contains 3 BIU’s, 6 FOI’s, and a power supply mod-
ule.
Each master frame in a system needs to be pow-
ered by a power supply module. The backplane in
the master frame will distribute the supply voltage
to all of the modules in the frame. The frame has
two molex plugs for accepting power from a power
supply module. Two dual plugs allow a primary and
redundant power supply to be connected to the
master frame. This connection scheme will ensure
operation even if one supply should fail. The frame
also contains a pair of fans used to ventilate the
modules housed in the frame. These are quality
fans with a high MTBF.
A power supply module that is connected to a mas-
ter frame does not necessarily have to be housed
in the frame. Quite often a system will have more
than one power supply module which will be placed
together in one frame for easy access.
BUI Module (Base Station Interface Module)
The BIU is the interface between the operator's
base station and the Fiber-DAS system. This mod-
Figure 8:
RF Config drop-down menu selection.
