Microtronix Access User Guide
2.6 Power Requirements
The Access Gateway operates from a -48VDC power source.
The maximum power dissipation is listed below.
Operating Voltage
Access 1000
-48 VDC
Access 4000
-48 VDC
Current Draw (maximum) 125 mA 350 mA
Power 6 Watts 17 Watts
BTU 21 BTU / hour 58 BTU / hour
Fuse 1 Amp 1 Amp
2.6.1 -48VDC Electrical Connection
The Access 1000 and 4000 with the -48VDC option are designed to operate from an approved -48VDC
Secondary Extra-low Voltage (SELV) commercial battery backed power source used in TELCO Central
Office (CO) applications. A 3-pin male power connector – suitably labeled – is provided on the rear of
the unit for connecting the -48VDC power source. The unit is protected against reverse polarity
connection of the -48VDC power source. The 48VDC power connection should be protected with a
2A, 50VDC fuse or circuit breaker.
A flame retardant wire harness with a 3-pin female jack is provided for making the -48VDC power
connection. Three #22 AWG wires in the harness provide the DC power: red +, black -, and one green
wire provides the chassis ground connection.
The Frame Ground screw connection on the rear panel must be used in order to comply with
installation requirements. This #8-32 machine screw has two external toothed (star) lock washers to
secure the unit rear plate Frame Ground connection to the Central Office GND system.
The terminal lug of the green wire ground wire must be placed between the star washers to assure an
adequate connection. A #14 AWG or larger copper wire must be used; its length should be minimized
to assure effectiveness for controlling ESD and EMI.
The Access 1000 wire harness (part number W1000) has an On Shore Technology # OSTTJ0331530
(Digi-Key # ED287-ND) 3-position female jack.
Model 1000-Nxx -48VDC power connector and W1000 wire harness
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