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You need 9V/1A supply (with +9V at center pin) for your model with beige case. Do not use 22V/1.5A supply for old 33.6k model with gray case. The shapes of the cases are very similar (56k has fever leds, no external volume control, and no connectors for external telephone equipment and external speaker), but the power supply voltages and currents are completely different. I hope this will help.
I have purchase a U.S. Robotics 56K Fax Modem (USB) but when I installed in windows xp after modem driver installation some file could not setup properly then a message shown that continue anyway or cancel option. So that I need a fresh windows xp based U.S. Robotics 56K Fax Modem (USB) driver. My model no. is 5633. Please do something for us.
Bangladesh Sericulture Research & Training Institute