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USB Powered Hub vs. USB Active/Repeater Extension cable

greenmeansgoooo 13,930 3,398 September 5, 2011 at 09:09 PM More Amazon Deals
do I understand these correctly:

a powered USB hub is for USB devices that draw a significant voltage/current from the USB port that the computer/laptop cannot handle. I finally ran into trouble were i have 3 wifi devices at the end of a 30' USB cable (2 x 15' cables). the power hungry TL-WN722N [amazon.com] wireless network adapter made the laptop BSD eventually when running by itself with inssider and couldnt even be detected when it was plugged in with the other 2 wifi network devices. the laptop has a powered USB port, but apparently it was only enough power to use either of the other 2 weaker wifi network adapters. a powered USB hub remedied the lack of USB power for using all 3 wifi network devices at the same time on the single USB cable.

a USB active/repeater extension cable is to 'repeat' the data when you go over 30' and up to 90' where if you have a longer then 90' USB length it may or may not work at all.
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#2
My understanding is that a usb hub draws power from two different power sources so it can recognize and utilize the USB devices that are plugged into the hub. One is the USB bus from the USB controller chip in the computer, which normally has 500mA limit for all the ports on the hub/controller combined, the other source is external (ex. AC adapter). Most AC adapters for USB hubs have limited current rating below 2A, or 2000mA, which is still not enough if you have a hub with more than four devices plugged in and try to use all of them at the same time..

Most 2.5" laptop hard drives now works with 500mA or less current while USB portable optical drives require more (thus there are two USB ports on one end and a micro USB port on the other of the cable). My guess is the three USB wifi devices consume more than 500mA USB bus power so the most power-hungry one can't function without the external power.

When they say the laptop has a "powered" USB port, I think they only mean that port supplies power even when the laptop is off so users can use that USB port to charge their portable devices (ex. cellphones) on the road. But most of them still have the 500mA current limit.

No idea about the USB signal repeater. I do remember wikipedia article mentioned about USB distance limit. I wonder if the wireless USB has similar distance limitation.
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#3
Speculation here but I would think a powered hub should do what you want (Provide full power to all 3 adapters). Just make sure it draws its power from an AC source, not the PC its self.

Out of curiosity why so many adapters on one pc? Doing some War driving? LOL
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#4
Quote from greenmeansgoooo View Post :
do I understand these correctly:

a powered USB hub is for USB devices that draw a significant voltage/current from the USB port that the computer/laptop cannot handle. I finally ran into trouble were i have 3 wifi devices at the end of a 30' USB cable (2 x 15' cables). the power hungry TL-WN722N [amazon.com] wireless network adapter made the laptop BSD eventually when running by itself with inssider and couldnt even be detected when it was plugged in with the other 2 wifi network devices. the laptop has a powered USB port, but apparently it was only enough power to use either of the other 2 weaker wifi network adapters. a powered USB hub remedied the lack of USB power for using all 3 wifi network devices at the same time on the single USB cable.

a USB active/repeater extension cable is to 'repeat' the data when you go over 30' and up to 90' where if you have a longer then 90' USB length it may or may not work at all.
Web Cam instead of IP Cams??
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#5
Quote from LiquidRetro View Post :
Speculation here but I would think a powered hub should do what you want (Provide full power to all 3 adapters). Just make sure it draws its power from an AC source, not the PC its self.

this is what i ended up doing. i have the USB powered hub plugged into a remote controlled lamp module at the device end with all 3 wireless network adapters plugged in.

Out of curiosity why so many adapters on one pc? Doing some War driving? LOL
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Web Cam instead of IP Cams??
I like to periodically check the wifi in the area to see what is out there and available for emergencies.

as for the cams, i use both IP and webcams with the blueiris software.
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