Re: Off-Topic: question about usb-hub power

2011-07-21 Thread Mehmet Erol Sanliturk 
On Thu, Jul 21, 2011 at 5:03 PM, Aleksandr Rybalko  wrote:

> Hi,
>
> I don't know which chip used in your D-Link hub Uffe, but I believe
> this one made with respect of standard.
>
> Uffe, can You do simple test with your device:
> 1. connect your device to active PC and check if it charging.
> 2. put your PC in StandBy or PowerOff mode(don't remove power cord),
> reattach your device and also check if device still charging.
>
> In both cases most devices will continue charging, but some "smart"
> device in second case disable charging. (my Sony PRS-600)
>
> I was trying to charge my PRS with power supply with USB connector, and
> reader don't start charging. So charging can start only after some
> interaction between USB host and device.
>
>
>
...


> WBW
> --
> Aleksandr Rybalko 
>



There is another kind of devices which it is very likely that some of them
can be found in any local computer store :


USB AC Chargers :


A few sample pages would be :

http://jingshuo888.en.made-in-china.com/product/doLQBGEUHIWS/China-2-Port-USB-AC-Charger-JS-ACN037-.html

http://www.eforcity.com/universal-usb-travel-charger-adaptor-dothusbtcad1.html

http://www.overstock.com/Electronics/AC-USB-Power-Adapter-Charger/2453811/product.html




Thank you very much .

Mehmet Erol Sanliturk
___
freebsd-usb@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-usb
To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"

Re: Off-Topic: question about usb-hub power

2011-07-21 Thread Aleksandr Rybalko 
Hi,

I don't know which chip used in your D-Link hub Uffe, but I believe
this one made with respect of standard.

Uffe, can You do simple test with your device:
1. connect your device to active PC and check if it charging.
2. put your PC in StandBy or PowerOff mode(don't remove power cord),
reattach your device and also check if device still charging.

In both cases most devices will continue charging, but some "smart"
device in second case disable charging. (my Sony PRS-600)  

I was trying to charge my PRS with power supply with USB connector, and
reader don't start charging. So charging can start only after some
interaction between USB host and device. 

On Thu, 21 Jul 2011 12:36:29 -0400
Mehmet Erol Sanliturk  wrote:

> On Thu, Jul 21, 2011 at 9:50 AM, Uffe Jakobsen  wrote:
> 
> >
> >
> > On 2011-07-21 14:55, Mehmet Erol Sanliturk wrote:
> >
> >>
> >>
> >> On Thu, Jul 21, 2011 at 7:12 AM, Uffe Jakobsen  >> > wrote:
> >>
> >>Apologies if this is a kind of off-topic for this list - since
> >> it does not have anything to do with FreeBSD.
> >>
> >>The external USB-hubs (v2.0) that I've come across comes in two
> >>categories:
> >>
> >>Some are willing to deliver power (500mA pr. connector) even if
> >> the hub isn't connected to a computer - and some that doesn't do
> >> this - the hubs that I have purchased from Dlink falls into the
> >> last category.
> >>
> >>I looking for an USB hub that is willing to deliver power
> >> without it beeing connected to a computer in order to drive some
> >> external units
> >>- no it is not a mobile-phone ;-)
> >>
> >>Could anyone give me a hint what specs to look for ? - before I
> >>actually buy another hub - the Dlink ones were not a success...
> >>
> >>
> >
> >> I do not know whether the above answer is correct for you or not .
> >>
> >>
> > Hi Mehmet,
> >
> > Thanks for your answer - it has revealed that my initial inquiry
> > was quite inaccurate - my apologies for that.
> >
> > I'll try to fill out the gaps.
> >
> > The product I'm referring to is a Dlink DUB-H7 (
> > http://www.dlink.com/products/?pid=149). A standard USB 2.0 hub
> > with 7 ports that can be powered from an external power supply.
> >
> > I do know how to determine if there is power on an usb connector
> > (pins 1+4)
> > - also I know the math involved in making sure that the hub is not
> > overloaded - but that it not really the issue here.
> >
> > This usb-hub will (apparently like so many other usb-hubs) only
> > apply power to its connectors if it is connected to a computer
> > (that is running) - and that applies even if the external power
> > supply is connected to the usb-hub.
> >
> > Let me give you an example:
> > You want to charge your mobile phone but you haven't brought the
> > charger itself. You've only got the micro-usb cable for the mobile
> > phone and the above mentioned Dlink hub - also you've got no
> > computer at hand. Now connecting the mobile phone to the usb-hub
> > while the usb-hub is connected to the external power supply will
> > not make the mobile phone start charging. This will only happen
> > once you connect the "uplink" usb cable from the usb-hub and to a
> > computer and boot it up.
> >
> > Let me add here that this has nothing to do with the complexity and
> > internal logic of the mobile phone mobile phone and its software -
> > it could be any other device that can drain its power from an usb
> > cable.
> >
> > I've previously owned an usb hub that would deliver power without
> > beeing connected to a running computer - but unfortunately that was
> > lost during relocation - and I do not remember the model/brand.
> >
> > Now I realize that this functionality is a part of the usb standard
> > - and that leads to my original question:
> >
> > It there anyway to determine this habit without unpacking and
> > testing every the usb-hub ?
> >
> > Kind regards Uffe
> >
> >
> >
> 
> 
> 
> 
> >From the Wikipedia page
> 
> http://en.wikipedia.org/wiki/USB_hub :
> 
> "However, there are many non-compliant hubs on the market which
> announce themselves to the host as self-powered despite really being
> bus-powered ."
> 
> 
> It seems that the above unit is NOT using the power supply .
> 
> 
> One way to learn a suitable model is that one of the subscribers of
> this list knowing that will answer over time .
> 
> Personally I do not know . < Forget this , please :
> 
> 
> I have a
> 
> 
> Targus 7-port Hub
> USB 2.0 Desktop Hub with a AC Adapter
> Barcode : 5 024442 863608
> ( ACH82EU )
> 
> 
> Targus Europe Ltd.
> 
> http://www.targus.com/uk/
> 
> In that site , search
> 
> 
> Targus 7-Port USB Desktop Hub
> 
> 
> 
> My unit is different than the above as model number . Therefore I can
> not say that they are exactly equivalent , but my expectation is that
> they will be similar with respect to power delivery to pins .
> 
> I have measured voltage across pins 1 and 4  just only it is
> connected to AC power

Re: Off-Topic: question about usb-hub power

2011-07-21 Thread Mehmet Erol Sanliturk 
On Thu, Jul 21, 2011 at 9:50 AM, Uffe Jakobsen  wrote:

>
>
> On 2011-07-21 14:55, Mehmet Erol Sanliturk wrote:
>
>>
>>
>> On Thu, Jul 21, 2011 at 7:12 AM, Uffe Jakobsen > > wrote:
>>
>>Apologies if this is a kind of off-topic for this list - since it
>>does not have anything to do with FreeBSD.
>>
>>The external USB-hubs (v2.0) that I've come across comes in two
>>categories:
>>
>>Some are willing to deliver power (500mA pr. connector) even if the
>>hub isn't connected to a computer - and some that doesn't do this -
>>the hubs that I have purchased from Dlink falls into the last category.
>>
>>I looking for an USB hub that is willing to deliver power without it
>>beeing connected to a computer in order to drive some external units
>>- no it is not a mobile-phone ;-)
>>
>>Could anyone give me a hint what specs to look for ? - before I
>>actually buy another hub - the Dlink ones were not a success...
>>
>>
>
>> I do not know whether the above answer is correct for you or not .
>>
>>
> Hi Mehmet,
>
> Thanks for your answer - it has revealed that my initial inquiry was quite
> inaccurate - my apologies for that.
>
> I'll try to fill out the gaps.
>
> The product I'm referring to is a Dlink DUB-H7 (
> http://www.dlink.com/products/?pid=149). A standard USB 2.0 hub with 7
> ports that can be powered from an external power supply.
>
> I do know how to determine if there is power on an usb connector (pins 1+4)
> - also I know the math involved in making sure that the hub is not
> overloaded - but that it not really the issue here.
>
> This usb-hub will (apparently like so many other usb-hubs) only apply power
> to its connectors if it is connected to a computer (that is running) - and
> that applies even if the external power supply is connected to the usb-hub.
>
> Let me give you an example:
> You want to charge your mobile phone but you haven't brought the charger
> itself. You've only got the micro-usb cable for the mobile phone and the
> above mentioned Dlink hub - also you've got no computer at hand.
> Now connecting the mobile phone to the usb-hub while the usb-hub is
> connected to the external power supply will not make the mobile phone start
> charging. This will only happen once you connect the "uplink" usb cable from
> the usb-hub and to a computer and boot it up.
>
> Let me add here that this has nothing to do with the complexity and
> internal logic of the mobile phone mobile phone and its software - it could
> be any other device that can drain its power from an usb cable.
>
> I've previously owned an usb hub that would deliver power without beeing
> connected to a running computer - but unfortunately that was lost during
> relocation - and I do not remember the model/brand.
>
> Now I realize that this functionality is a part of the usb standard - and
> that leads to my original question:
>
> It there anyway to determine this habit without unpacking and testing every
> the usb-hub ?
>
> Kind regards Uffe
>
>
>




>From the Wikipedia page

http://en.wikipedia.org/wiki/USB_hub :

"However, there are many non-compliant hubs on the market which announce
themselves to the host as self-powered despite really being bus-powered ."


It seems that the above unit is NOT using the power supply .


One way to learn a suitable model is that one of the subscribers of this
list knowing that will answer over time .

Personally I do not know . < Forget this , please :


I have a


Targus 7-port Hub
USB 2.0 Desktop Hub with a AC Adapter
Barcode : 5 024442 863608
( ACH82EU )


Targus Europe Ltd.

http://www.targus.com/uk/

In that site , search


Targus 7-Port USB Desktop Hub



My unit is different than the above as model number . Therefore I can not
say that they are exactly equivalent , but my expectation is that they will
be similar with respect to power delivery to pins .

I have measured voltage across pins 1 and 4  just only it is connected to AC
power line ( without any connection to any computer , even USB connection
cable is not plugged ) .


It is giving 5.00 volts between these two pins . I checked by reverse
measuring ( to see effect of sign ) . It is giving either 5.00 or -5.00
volts when measuring pins are reversed .

It is very likely that you will be able to find that model .


Unfortunately , within product definition documents , mostly there is no any
clue about your question .


Another very simple test may to use a USB light .
In computer shops it is very likely that it is possible to find "open" units
for inspection by customers .

Attach a USB light such as

http://www.amazon.com/Portable-Flexible-Light-Laptops-Notebooks/dp/B002WI8GG8/ref=sr_1_1?ie=UTF8&qid=1311265897&sr=8-1

If it gives light , means that pins are receiving power directly from AC
power supply .


My knowledge is so much .


Thank you very much .


Mehmet Erol Sanliturk
___
freebsd-usb@freebsd.org mailing li

Re: Off-Topic: question about usb-hub power

2011-07-21 Thread Uffe Jakobsen 



On 2011-07-21 14:55, Mehmet Erol Sanliturk wrote:



On Thu, Jul 21, 2011 at 7:12 AM, Uffe Jakobsen mailto:u...@uffe.org>> wrote:

Apologies if this is a kind of off-topic for this list - since it
does not have anything to do with FreeBSD.

The external USB-hubs (v2.0) that I've come across comes in two
categories:

Some are willing to deliver power (500mA pr. connector) even if the
hub isn't connected to a computer - and some that doesn't do this -
the hubs that I have purchased from Dlink falls into the last category.

I looking for an USB hub that is willing to deliver power without it
beeing connected to a computer in order to drive some external units
- no it is not a mobile-phone ;-)

Could anyone give me a hint what specs to look for ? - before I
actually buy another hub - the Dlink ones were not a success...





I do not know whether the above answer is correct for you or not .



Hi Mehmet,

Thanks for your answer - it has revealed that my initial inquiry was 
quite inaccurate - my apologies for that.


I'll try to fill out the gaps.

The product I'm referring to is a Dlink DUB-H7 
(http://www.dlink.com/products/?pid=149). A standard USB 2.0 hub with 7 
ports that can be powered from an external power supply.


I do know how to determine if there is power on an usb connector (pins 
1+4) - also I know the math involved in making sure that the hub is not 
overloaded - but that it not really the issue here.


This usb-hub will (apparently like so many other usb-hubs) only apply 
power to its connectors if it is connected to a computer (that is 
running) - and that applies even if the external power supply is 
connected to the usb-hub.


Let me give you an example:
You want to charge your mobile phone but you haven't brought the charger 
itself. You've only got the micro-usb cable for the mobile phone and the 
above mentioned Dlink hub - also you've got no computer at hand.
Now connecting the mobile phone to the usb-hub while the usb-hub is 
connected to the external power supply will not make the mobile phone 
start charging. This will only happen once you connect the "uplink" usb 
cable from the usb-hub and to a computer and boot it up.


Let me add here that this has nothing to do with the complexity and 
internal logic of the mobile phone mobile phone and its software - it 
could be any other device that can drain its power from an usb cable.


I've previously owned an usb hub that would deliver power without beeing 
connected to a running computer - but unfortunately that was lost during 
relocation - and I do not remember the model/brand.


Now I realize that this functionality is a part of the usb standard - 
and that leads to my original question:


It there anyway to determine this habit without unpacking and testing 
every the usb-hub ?


Kind regards Uffe



___
freebsd-usb@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-usb
To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"

Re: Off-Topic: question about usb-hub power

2011-07-21 Thread Mehmet Erol Sanliturk 
On Thu, Jul 21, 2011 at 7:12 AM, Uffe Jakobsen  wrote:

>
>
> Hi,
>
> Apologies if this is a kind of off-topic for this list - since it does not
> have anything to do with FreeBSD.
>
> The external USB-hubs (v2.0) that I've come across comes in two categories:
>
> Some are willing to deliver power (500mA pr. connector) even if the hub
> isn't connected to a computer - and some that doesn't do this - the hubs
> that I have purchased from Dlink falls into the last category.
>
> I looking for an USB hub that is willing to deliver power without it beeing
> connected to a computer in order to drive some external units - no it is not
> a mobile-phone ;-)
>
> Could anyone give me a hint what specs to look for ? - before I actually
> buy another hub - the Dlink ones were not a success...
>
> Thanks in advance.
>
> Kind regards Uffe Jakobsen
>
>
>

For me . it is difficult to understand your question . Any links to actual
products in such questions may clarify the subject matter very much .

In market , there are mainly two kinds of USB hubs :

 - without power supply , mostly up to four ports or less :

Example :
http://www.amazon.com/Connectland-CL-U2MNHUB-4B-Ports-V2-0-Black/dp/B0028Y4F4S/ref=sr_1_3?ie=UTF8&qid=1311251176&sr=8-3



 - with power supply , mostly with more than four ports :

Example :
http://www.amazon.com/Black-Ports-Speed-Power-Adapter/dp/B00475WJEY/ref=sr_1_9?ie=UTF8&qid=1311250656&sr=8-9



If you need power in ports even it is NOT connected to a computer or there
is no power from the computer ( it is switched off )  , you need at least a
power supply powered USB hub .


Also , the following page contains explanations about power in USB hubs :

http://en.wikipedia.org/wiki/USB_hub
http://en.wikipedia.org/wiki/Category:USB
http://en.wikipedia.org/wiki/USB


To understand whether a hub is delivering power to ports when it is not
connected to the computer or the computer is switched of , you may measure
voltages in its port pins ( 1 and 4 ) by powering the hub by its power
supply only :

If there is NO voltage , the power supply is bogus ( or eye painting ) . If
there is sufficient voltage it means that the hub is powering its ports
itself without getting power from the computer port .

Power level of power supply should be sufficiently powerful to supply 500 mA
to each port , means

( Total power rating ) = ( Number of Ports ) x 500 mA .

( This may require to buy another power supply for the hub if its power
supply is not sufficiently powerful ) .

OR ,

It is necessary to consciously NOT to exceed the total power of the power
supply by attaching less number of devices to ports :


( Power rating of power supply of hub ) / 500 mA = ( Number of devices
attachable to Ports )

( which is NOT a good selection because if this point is forgotten it is
possible to easily exceed the capacity of the power supply means destroy of
your hub or malfunctioning of data transmission , if I am correct ... ) .


I do not know whether the above answer is correct for you or not .


Thank you very much .


Mehmet Erol Sanliturk
___
freebsd-usb@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-usb
To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"

Off-Topic: question about usb-hub power

2011-07-21 Thread Uffe Jakobsen 



Hi,

Apologies if this is a kind of off-topic for this list - since it does 
not have anything to do with FreeBSD.


The external USB-hubs (v2.0) that I've come across comes in two categories:

Some are willing to deliver power (500mA pr. connector) even if the hub 
isn't connected to a computer - and some that doesn't do this - the hubs 
that I have purchased from Dlink falls into the last category.


I looking for an USB hub that is willing to deliver power without it 
beeing connected to a computer in order to drive some external units - 
no it is not a mobile-phone ;-)


Could anyone give me a hint what specs to look for ? - before I actually 
buy another hub - the Dlink ones were not a success...


Thanks in advance.

Kind regards Uffe Jakobsen



___
freebsd-usb@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-usb
To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"