User Manual
Table Of Contents
- 1 About this Guide
- 2 System Overview
- 3 Installation Prerequisites
- 4 Physical Description
- 5 BSDU Description
- 6 GPSD Description
- 7 GPS Description
- 8 AC/DC Power Converter
- 9 Mounting the Base Station Radio (BSR)
- 10 Mounting the BSDU
- 11 Mounting the GPS
- 12 Mounting the AC/DC Power Converter
- 13 Cabling the BSR
- 14 Connecting the SDA-4S to the power supply
- 15 Connecting Power Cable for SDA-4SDC
- 16 Connecting BSDU to AC/DC Power converter
- 17 Lightning and Surge Protection
- 18 Connecting Third-Party External Antennas
- 19 Appendix
MicroMAX Hardware Installation User Guide
Page 31 Commercial in Confidence UWB-D00068 Rev J
5 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 cable connectivity.
The AIRSPAN WIMAX Base Station Distribution Unit (BSDU) provides an interface between
multiple MicroMAX (BSRs) and the service provider’s backbone. The BSDU provides the
following functionalities:
¾ Data switching and aggregation:
• Data switching between up to eight MicroMAX BSRs over 10/100 BaseT interface.
• Aggregate the MicroMAX BSRs data via two 1000BaseT Ethernet (GE) ports towards
the backhaul/backbone or to cascade to another BSDU.
¾ Synchronization:
• Tx / Rx TDD synchronization for multiple MicroMAX BSRs per BSDU and between
connected BSDUs.
• GPS for TDD Tx / Rx synchronization of different BS sites.
¾ Power distribution
• Provides DC power from a single -48 VDC source to eight MicroMAX BSRs.
• 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.
5.1 Physical Dimensions
The table below lists the physical dimensions of the BSDU.
Table12‐BSDUdimensions
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.
The figure below illustrates the BSDU's physical dimensions.