Moseley Associates Inc EVENTHD ユーザーズマニュアル

48v (Isolated Input); 2-pin captive power connector. The 

Software Defined IDU™ requires an input of 48 volts dc 
±10% at the rear panel DC Input connector.  The total 

required power is dependent on the option cards and 
protection configuration (1+0, 1+1).  The SDIDU

 rear 

panel power connector pin numbering is 1 through 2, 
from left to right, when facing the unit rear panel. Pin 1 

is the power supply return and is connected to unit 
chassis ground internally.  Pin 2 should be supplied with 
a nominal 48 V dc, with respect to the unit chassis 

(ground).  A ground-isolated supply may be used, 
provided it will tolerate grounding of its most positive 

output. 

The recommended power input is 44 to 52 V dc at 2 

Amps minimum.  It is recommended that any power 
supply used be able to supply a minimum of 100 W to 

the SDIDU

. 

A mating power cable connector is supplied with the 
Software Defined IDU™.  It is a 2-pin plug, 5 mm pitch, 

manufactured by Phoenix Contact, P/N 17 86 83 1 
(connector type MSTB 2,5/2-STF).      This  connector  has 

screw clamp terminals that accommodate 24 AWG to 12 
AWG wire.  The power cable wire should be selected to 

provide the appropriate current with minimal voltage 
drop, based on the power supply voltage and length of 

cable required.  The recommended wire size for power 
cables under 10 feet in length supplying 48 Vdc is 18 
AWG. 

The SDIDU

 supplies the ODU with all required power 

via the ODU/SDIDU

 Interconnect cable.  The Software 

Defined IDU™  does not have a power on/off switch.  
When DC power is connected to the SDIDU

, the digital 

radio powers up and is operational.  There can be up to 
320 mW of RF power present at the antenna port 

(external antenna version).  The antenna should be 
directed safely when power is applied.