# Are input voltages of all FXS interfaces the same

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Input voltages of FXS interfaces vary depending on the device.

###### Other related questions:

Are the supply voltages of the FXS interfaces on AR routers the same
The supply voltages of the FXS interfaces on different AR routers may not be the same.

Whether the input voltage values of two PIU boards must be the same
The input voltage values of two PIU boards can be different but must be in the permitted range. The input voltage range is as follows:
�?8 V DC: �?0 V to �?7.6 V
�?0 V DC: �?8 V to �?2 V

Whether IAD FXS port does not output voltage
IAD FXS port does not output voltage.

What are the voltage and current parameters on a U1900 series unified gateway?
The voltage and current parameters on the U1980 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 400 W
Input current (AC): 6 A
Maximum output power (AC): 500 W
The voltage and current parameters on the U1981 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 220 W
Input current (AC): 4.5 A
Maximum output power (AC): 300 W
The voltage and current parameters on the U1960 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 220 W
Input current (AC): 3.5 A
Maximum output power (AC): 300 W
The voltage and current parameters on the U1930 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 220 W
Input current (AC): 3.5 A
Maximum output power (AC): 300 W
The voltage and current parameters on the U1910 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 200 W
Input current (AC): 3.5 A
Maximum output power (AC): 300 W
The voltage and current parameters on the U1911 are listed as follows:
Input voltage (AC): 100?240 V AC
Maximum power consumption in full configuration: 150 W
Input current (AC): 3.5 A
Maximum output power (AC): 300 W

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