Operation Manual

Fiber Distributed Antenna System (Fiber DAS)
35
DMU – Remote head end
Bird's DMU100 series is a compact head end that can function as a low power repeater or BTS interface. The unit
can directly support up to 4 remotes or can fiber feed a Headend Master Unit. Remote access is provided by either
the Bird RGW or via Ethernet connection. The unit is a rugged convection cooled, IP65 chassis designed for outdoor
locations.
It is possible to build the DMU to support more than one band, however, the types of bands and the necessary
duplexers for a configuration must be verified to ensure compatibility with the RGW.
Figure 20 DMU – Remote Head End
In Figure 21 , the DMU is used to pick up the signal at a remote location and then it is transmitted on the fiber to
four different locations that need coverage. The RU can be connected to coaxial spreading networks if needed.
Figure 21
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DMU Feeding Remote Units
In Figure 22 , the DMU is feeding a Headend Master Unit which in turn feeds the Remote Units (RU). This is a far
more flexible solution and would be preferred when possible.
Figure 22
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Fiber-Optic Cable
DMU Feeding BMU
The DMU is equipped with a low power uplink amplifier. The unit should be used in a location that has adequate
signal so that power level of a mobile phone will suffice.