User's Manual

21
BSDU DESCRIPTION
This section provides a description of the Base Station Distribution Unit (BSDU).
The BSDU is connected to the BSRs by standard CAT-5e cables. Each BSDU can service a maximum
of 8 BSRs. In addition, up to two BSDUs can be daisy-chained at a Base Station, supporting up to
16 BSRs. Therefore, a Base Station at maximum configuration can serve up to 8192 subscribers
(i.e. 16 BSRs multiplied by 512 subscribers).
The BSDU provides a 15-pin D-type port for interfacing with the BSRs, for convenience, a DB15-to-
RJ45 adapter is supplied for attaching to the 15-pin D-type port to allow the use of RJ-45
connectors for outdoor-to-indoor CAT-5e connectivity.
The AS.MAX Base Station Distribution Unit (BSDU) provides an interface between multiple MicroMAX
(BSRs) and the service provider’s backbone. The BSDU provides the following functionalities:
Data switching and aggregation:
o Data switching between up to eight MicroMAX BSRs over 10/100 BaseT interface
o Aggregate the MicroMAX BSRs data via two 1000BaseT Ethernet (GE) ports towards the
backhaul/backbone or to cascade to another BSDU
Synchronization:
o Tx / Rx TDD synchronization for multiple MicroMAX BSRs per BSDU and between
connected BSDUs
o GPS for TDD Tx / Rx synchronization of different BS sites
Power distribution
o Provides DC power from a single 48 VDC source to eight MicroMAX BSRs
o AC/DC power converter (optional) - in the event -48 VDC is not available at BS site
Note: The unit should be powered by 48Vdc (40-54Vdc), 4.5A from safety approved power
supply that its output is SELV and is separated from mains by minimum double/reinforced
insulation.
Physical Dimensions
The table below lists the physical dimensions of the BSDU.
Parameter Value Comment
Height 43.2 mm (1.7 inches)
Width 482.6 mm (19
inches)
Depth 228.6 mm (9 inches)
Weight 2.9 kg
The physical dimensions exclude the bracket flanges for
mounting.