Comtech EF Data SMS-758 - Manual (Page 112)

Theory of Operation SMS-758 Modem Protection Switch
4–52 MN/SMS758 Rev. 3
4.11 Power Supply
The power supply modules fit in slots 1 or 7 of the upper front section of the switch
chassis.
In slot 7, the supply is inverted.
The supplies are enclosed in a 10.5” x 3.5” x 2.5” metal frame that encloses the power
supply assembly, provides power switch access, and secures in the chassis.
To turn ON the power supply, press the switch toward the “1” symbol on the front of the
frame, or so the red part of the switch is visible.
The switch is fully functional with only one power supply turned ON, but an M:N fault
will indicate that the other power supply is faulted.
The frame can accommodate many different manufacturer’s power supplies, thus
providing for different power input specifications.
4.11.1 Specifications
120 VAC and 220 VAC Operation
Input voltage 90 to 264 VAC.
Automatic selection for 110 or 220 V operation.
Input Frequency 47 to 63 Hz.
Output Voltages and Current Capacity +5V at 5A, +12V at 0.5A, -12V at 0.5A.
-48 VDC Operation is optional, and specifications will be provided upon request.