DESCRIPTION OF PARTS
6
Notes:
If the LED flashes red/green, disconnect the DTE (X.21 or V.35) signal to the DC3X00 in
order to distinguish between LOF and AIS alarms. The loss of the DTE signal will then cause
either the red/green/off or the green/red/off sequence to occur, depending upon the
condition which has occurred.
2. 3 Power supply
The DSU is powered by a mains supply with an input voltage of 100-250VAC, 50-60Hz,
35-15 mA. The input power consumption is approximately 3.5 watts. The DC3X00 is
provided ex-factory with a 250mA internal fuse. Mains power is connected via the IEC inlet
on the rear of the unit.
An alternative -48VDC powered unit is available. The input voltage and current ranges are
minus 36 to minus 72 volts DC, 100-50mA. A Buccaneer type socket is fitted to the rear
panel, and a plug is provided with the unit for the customer’s own wiring. The connections
are labelled on the rear panel of the DC3X00.
On some units, an additional Ground stud may be located on the rear panel to permit a
separate Ground connection to be made.
Figure 2.4 -48VDC connections
Note:
The DSU must be connected to mains safety earth for correct operation.
Pin no
Connection
1
-48VDC
2
Ground
3
0VDC
