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Theory of Operation
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
Input voltage
Input Frequency
Output Voltages and Current Capacity
-48 VDC Operation is optional, and specifications will be provided upon request.
4–52
120 VAC and 220 VAC Operation
90 to 264 VAC.
Automatic selection for 110 or 220 V operation.
47 to 63 Hz.
+5V at 5A, +12V at 0.5A, -12V at 0.5A.
SMS-758 Modem Protection Switch
MN/SMS758 Rev. 3
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