CANOGA PERKINS 2361 T1 Modem - Manual (Page 21)

The EdgeAccess Universal Chassis System
2361 Modem Users Manual 2-5
Operation:
Note: When connecting the alarm output to an external source, use twisted pairs and terminate
the cable shield at the user side.
2.4 Providing Power to the 2361 DC Modem
The -48 volt base unit is intended for use with an external -48VDC power supply. A two piece
terminal block connector is provided. It is clearly marked as to which screw lug is to be attached
to the positive (+) and negative (-) 48 volts DC terminals.
Note: Check signal ground (GND) of the source supply and orient it to the Modem GND, or
chassis ground. Verify with a ohmmeter that (+) and (-) are not shorted prior to applying power.
Figure 16. DC Power Entry Close-up
Warning! Turn off the -48VDC power supply to be completely sure that there is no more
power. Use a voltmeter to measure the voltage across the negative (-) and
positive (+) source DC leads. Set the voltmeter to a range that makes it
capable of measuring up to 75VDC. The measurement across the positive and
negative leads should be zero (0) volts.
To provide power to the 2361 standalone modem DC version, do the following:
1. Remove the power terminal block from the rear panel of the unit.