Receieved this modem without an power supply adapter. Following are the details of the modem: 3COM U.S. Robotics 56k Voice Faxmodem Pro Model number is: 0525 FCC Reg.No. : 4X2USA-32128-M5-E I emailed USR tech support and they informed me: Thank you for choosing U.S. Robotics. "I understand that you need power supply specification for USR5605. Power supply specification for USR5605 is V AC 1.5A." I have a universial ac-dc adaptor, and the specifications on that are: model: 900-100 input:100/220v 60/50Hz Power: 18 W Output: 1.5.-3-4.5-6-7.5-9-12V Current: DC 1000mA max Will this universial adaptar work with the external modem? I'm confused on which settings the tech support gave me. The "USR5605 is V AC 1.5A." I tried 1.5v and didn't power the modem on. I dont want to burnout or overload the modem, if anybody can please help me with this would be greatly appreciated. Thanks, allan

"Power supply specification for USR5605 is V AC 1.5A." It looks to me like they left a number out before the 'V'. I think there should be a voltage their (like 'possibly' '12') for a 12 Volt AC, 1.5 amp adapter. I suggest you ask them again.

My external modem adapter is powered at 9 VAC 1.5A

I have a US Robotics Professional Message Modem and that is 9 V at 1 Amp. Make sure you get the polarity the right way round as well. The jack plugs used to power external equipment do not have a standardised connections as far as polarity is concerned. Stuart

Thanks alot for the help! Setishock,ham30,stuart,lobsterboy,kage and all. I'm going to try 9v and see how it goes. I'll post an update see how it goes. You guys rock, thanks again! ap ps- setishock thx for the USR links, I tried both but couldn't find any power specifications just data specifications, I'll look more around the page.

I bought a power supply from radio shack, does anyone know what polarity to use for the usr?