-=PCTechTalk=- Re: Method to test hub?
- From: "rawhide101" <rawhide101@xxxxxxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Mon, 15 Jul 2002 16:49:44 -0400
This Jim concurs with the below reply from -Jim- . The problem is probably
interference as alluded to in paragraph #4 of my first reply.
The Gain-BandWidth product is a constant that is used in reference to
amplification, or gain, of ac signals. The amplifier accepts input signals and
converts the DC power from power supply to AC power. Pulse signals may be looked
upon as ac signals when they are the input signal to this type of amplifier. If
they are inputted to a digital gate the gate generally "refreshes" the input
signal to provide standard values voltage at its output; it may have other
features such as a high output impedance that may be set when the gate isn't
being used.
As you have indicated MN, for a given G-BW product in a given situation one must
sacrifice one value to obtain the other. Thus, in an audio signal amplifier a
wide bandwidth is often needed as well as high gain to obtain a required
output. The amplifier is first designed with very high gain and that is reduced
to the proper level by negative feedback; the result is an amplifier with
sufficient gain and bandwidth to meet design specifications.
We probably have the same hub, MN. Mine is a Belkin F5U021 and has five lights
on the top front edge (opposite from the USB connectors). The red light merely
shows DC power is connected; the green lights are for the USB connectors. The
ac-dc power adapter furnished dc voltages to each USB circuit in parallel with
the other three, thus reducing the possibility of inadequate DC voltage.
-Jim- is fortunate to have a mobo that permits him to measure current to each
USB port. Kinda wish mine did, but would probably not use it.
Jim
-----Original Message-----
From: pctechtalk-bounce@xxxxxxxxxxxxx
[mailto:pctechtalk-bounce@xxxxxxxxxxxxx]On Behalf Of Master NetLord
Sent: Monday, July 15, 2002 2:39 PM
To: pctechtalk@xxxxxxxxxxxxx
Subject: -=PCTechTalk=- Re: Method to test hub?
Well, this is one of those situations where I tried to answer quickly and didn't
choose my words correctly. In some documentation, bandwidth is used in place of
power, probably because the computer supplies the power along with the
bandwidth -- and when you exceed the designed amount of power, your equipment
fails (as you said too). I think you and I are in violent agreement <chuckle>
The situation here is I actually use four ports, the computer has only two
ports.
Regards from the
"Keyboard Cowboy",
Master NetLord
,,,,,
Ô¿Ô¬
Cincinnati, Ohio
Scottsdale, Arizona
«::::»¤«::::»¤¤«::::»¤«::::»
Monday
07/15/2002
2:31:35 PM
On Mon, 15 Jul 2002 11:23:23 -0400, Jim wrote:
>
>The POWER SUPPLY has NOTHING to do with the BANDWIDTH.
>
>The kind of problems your describing could indicate a power problem,
>but it could also be a software/driver interference problem.
>
>I don't know about your mobo, but on mine, I can check the amount of
>current being supplied to each USB port, not sure about my hubs
>which have their own seperate power supplies.
TRUNCATED...
>
>-Jim-
>
>
>Master NetLord wrote:
>>
>>Actually, the answer may lie within that thought -- I've been
>>thinking about this (ain't that dangerous <G>). There is a limit
>>to the bandwidth a USB device can use. The powwer supply is
>>supposed to give it additional power (bandwidth) but what if the
>>power supply went bad? That would, perhaps, explain why it won't
>>work, and why the light is red instead of green.
>>
>TRUNCATED...
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