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olrob · 03-01-2008, 01:12 PM

I have an external disk (HDD) usb connected to my dell pc with a standard usb cable. I connected two usb cables together via a 4 port usb hub without power and connected them between my pc and HDD. All works fine. I obtained some usb adapters which are similar to the hub, but much cheaper, with one B female (Bf) & one Af receptacle. When I substitute the adapter for the hub the pc says "no good" (paraphrased). I tried two adapters with the same result. Can't test the pin to pin continuity with my multimeter 'cause it's difficult to get the multimeter probes to touch the adapter pins.
What is different, electrically & pin wise, between the hub and the adapter? Both connect via Af & Bf receptacles to usb cables and all cables check out ok. Every description of usb pinouts say the same thing, pins 1 & 4 carry power and ground and pins 2 & 3 carry data.
Thanks

03-01-2008, 01:12 PM	#1
olrob Member (4 bit) Join Date: Mar 2008 Location: Near Boston Posts: 10	connecting 2 usb cables together I have an external disk (HDD) usb connected to my dell pc with a standard usb cable. I connected two usb cables together via a 4 port usb hub without power and connected them between my pc and HDD. All works fine. I obtained some usb adapters which are similar to the hub, but much cheaper, with one B female (Bf) & one Af receptacle. When I substitute the adapter for the hub the pc says "no good" (paraphrased). I tried two adapters with the same result. Can't test the pin to pin continuity with my multimeter 'cause it's difficult to get the multimeter probes to touch the adapter pins. What is different, electrically & pin wise, between the hub and the adapter? Both connect via Af & Bf receptacles to usb cables and all cables check out ok. Every description of usb pinouts say the same thing, pins 1 & 4 carry power and ground and pins 2 & 3 carry data. Thanks