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TB9400 Installation and Operation Manual

© Tait Limited March 2015

The PMU can provide an auxiliary DC output from the auxiliary power 
supply board. This board is available with an output of 13.65VDC, 
27.3VDC, or 54.6VDC (depending on the model), and is current limited to 
3A, 1.5A or 750mA respectively. This power supply is permanently on as 
soon as the base station has finished powering up, and is available on the 
auxiliary output connector on the rear panel.

You can connect multiple auxiliary power supply boards in parallel for 
redundancy purposes, or to provide an output greater than 40W. Although 
no active current sharing is used, auxiliary boards connected in parallel will 
current-share before reaching their power limit. The failure (or switching 
off) of one auxiliary board will not load any other paralleled auxiliary 
boards in the circuit.

The auxiliary power supply turns off briefly when the PMU restarts 
after a firmware upgrade. This interruption may also cause any ancillary 
equipment powered from the auxiliary supply to restart. If this is a prob-
lem for your system, we recommend connecting auxiliary power supply 
boards in parallel to ensure an uninterrupted power supply for the ancil-
lary equipment.

Network elements are supplied with a connector, as shown in 

. 

You can use this to connect the PMU’s auxiliary DC power output to 
another device (refer to 

 for the 

pin allocations).

Contact your regional Tait office for details on the full range of wiring kits 
available.

Phoenix MVSTBR2.5HC/2-ST/5.08 female