TABLE 1: TYPICAL VoIP DSL MODEM POWER-SUPPLY REQUIREMENTS
Parameter	Requirement
Input voltage(s)	115/230 V ac, 50/60 Hz
Output power	9.7 W maximum
Output parameters	Voltage	Max current (A)	Max ripple (mV p-p)	% of regulation
	+5 +3.3 +1.8 +1.5 −28 −72	0.75 0.40 0.40 0.05 0.02	50 30 30 30 500 1000	±5 ±3 ±3 ±3 ±15 ±15
Efficiency	Very system dependent from 50% to 85%