Question about Stratitec Computers & Internet
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Posted on Jan 02, 2017
Most USB hubs do not need an external power supply, except when a connected USB device draws more power than the computer/laptop USB port can supply. In this case an external power supply will need to be connected to the USB hub.
Normally this would be a 5 volt power supply, but make sure the polarity on the connector matches the power connector on the hub, check the label on the hub, sometimes it states to power requirements of the hub as well as the polarity on the connector. Normally the pin on the hub's power connector is positive (ie. +5V)
Posted on Nov 13, 2008
SOURCE: Entrega Hub 4U
The adapter that works on my machub4u y Entrega Technologies has a output of +5VDC at 2.5A with the inner post being positive and the barrel being negative.
Posted on Apr 03, 2009
SOURCE: Targus Travel USB 2.0 4-port Hub
Some external USB hard drives, typically 3.5" drives, draw more power than a singlee USB port can provide through one port (the standard is max 5v, 500mA per port). Usually the drive will ship with a USB cable with 2 USB male connectors on one end, with one colored red. This is for you to plug into a second USB port to draw up to an additional 500mA power through the cable to help spin up your external hard drive.
Most USB hubs I have seen draw a maximum of 2A or less and the allow this to be drawn upon by the ports at up to 500mA per port. But a 7-port hub will not be able to provide full power to more than 4 ports, which is normally OK because few devices pull the full 500mA. Sometimes just reducing the number of items on that USB hub to 3 or 4 will solve your issue. And you cal also use a hub with its own power source to help meet the current demand for all 7 ports.
Posted on Sep 23, 2011
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