Dan Jacobson
Guest
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 Posted:
Mon Dec 05, 2005 11:02 pm Post subject:
USB hub boost input voltage |
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What is that circular socket on USB hubs for? A power boost? By USB
hubs I mean the ones that turn one USB socket into four, etc.
I have two USB hubs, an Alcor Micro Hub, and a NEC HighSpeed Hub. Each
has a little round socket presumably for DC input. But no mention is
made about polarity and voltage, nor when one would need to give an
extra power boost.
There must be some standard. I suppose I can just connect the right
voltage wallwart to it? Wait, none of the standard adapters seem to
fit it. I suppose this is to prevent something stupid from occurring?
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PeteS
Guest
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| Posted:
Tue Dec 06, 2005 5:35 pm Post subject:
Re: USB hub boost input voltage |
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Dan Jacobson wrote:
| Quote: | What is that circular socket on USB hubs for? A power boost? By USB
hubs I mean the ones that turn one USB socket into four, etc.
I have two USB hubs, an Alcor Micro Hub, and a NEC HighSpeed Hub. Each
has a little round socket presumably for DC input. But no mention is
made about polarity and voltage, nor when one would need to give an
extra power boost.
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The units would normally spec, or come with, an appropriate wallwart in
most circumstances. You might try looking them up. Generally speaking,
the outer connector is V-, the inner V+ (but as this varies, look them
up first).
| Quote: |
There must be some standard. I suppose I can just connect the right
voltage wallwart to it? Wait, none of the standard adapters seem to
fit it. I suppose this is to prevent something stupid from occurring?
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The reason for the external power is possibly not only to provide extra
power beyond the USB spec, as the devices may be specified as
'self-powered' and would therefore require the wallwart to operate as
advertised.
Cheers
PeteS
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