BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
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Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Kev <invalid@invalid.invalid> hath wroth:
>I don't know whether I misread your previous post or not but I was
>referring to the USB ports in my laptop.
I was refering to the original posting which dealt with an unpowered
Sitecom Pocket HUB CN-032. There's no way I can tell what machine
you're talking about from your one line posting:
"It's different on mine. I have 4 ports and it specifies
that the Hub is self powered and total power available
is 500ma per port."
The issue is directly related to the problematic Buffalo WLI-U2-KG54
USB device as it might be drawing too much current from an unpowered
hub if other devices are also plugged into the hub at the same time.
What I was trying to get across is that:
1. You can get an idea of how much current a device can draw from the
USB device entry in the Windoze Device Manager or a variety of
utilities that will do the same thing. (i.e. Unknown Devices).
2. Not every device reports its current drain in the Device Manager.
3. Some devices lie. For example, wireless USB devices draw more
current in transmit than receive. Yet, I've seen only the receive
current reported. Adherence to standards is also somewhat problematic
as indicated in the Wikipedia article you posted.
4. The current is NOT a measurement of actual current drain, but
merely a number reported by the device.
5. The maximum load is 500ma per port for a powered USB hub, and
500ma for the entire hub, for an unpowered USB hub.
>I am wondering (amongst other things) if there is a bad connection somewhere
>on the laptop's USB port hardware that is stopping it from being able to
>deliver enough power to 'start' the wireless adaptor, but is still capable
>of delivering sufficient to be able to run flash drives.
I don't think that's happening. I've seen broken connectors and blown
fuses on USB devices. The usual result is an all or nothing affair.
It either works, or it doesn't. There's too much data negotiation and
error checking going on for anything to partially fail in the manner
you're experiencing.
>(I have had a look at opening up the laptop to get at the port assembly and
>check its contacts, but it seems to be very difficult to get at, requiring
>just about every other component to be removed first.)
Dell Inspiron 2600 as I recall. It's not listed here:
<http://repair4laptop.org/disassembly_dell.html>
You should be able to find disassembly instructions in the docs on the
Dell web pile. Bug me if you can't find them. I don't think you'll
be able to see the connections to the main PCB as many such USB
connectors are surface soldered. The better ones use plated through
holes in the PCB. With these, the leads are under the connector and
difficult to see.
There are also dedicated USB test tools and software avaialable. I
haven't used any. Search Google for "USB tester".
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Thanks Jeff,
I do have the laptop's service manual from Dell, and it doesn't say anything
about the USB ports as such, but it is clear from the way the strip down is
sequenced that these would be one of the last things to be uncovered - and I
think I'd be quite likely to break something before I got that far!
Meanwhile, after an afternoon of use on the pc, I plugged the adaptor into
the laptop again and was surprised to see both the Buffalo Wireless LAN
Adaptor AND the associated Buffalo Miniport Package Scheduler, appear in
device manager. The former soon dropped out to its yellow triangle state,
with the 'device cannot start code 10' message. On a whim, I put this into
google and checked some of the threads to come up with this one:
where quite a number of contributors do seem to be of the opinion that there
was a problem with older boards not being able to cope with the power
requirements of the later USB devices. This is getting me increasingly
confident that this really must be the cause, and I suspect that your
original idea of obtaining a USB2 card may be the way forward. One thing to
clear up: will the laptop be able to deliver power to the USB2 card any
better than it could to the old USB2 ports; and if not would a wireless
adaptor CARD be likely to fare any better than the USB adaptor has?
Kind regards,
S
"Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
news:ffg0v214253vhjn2kp9qcicjg138o5e9cv@4ax.com...
> "spamlet" <spam.morespam@spamola.invalid> hath wroth:
>
>>I am wondering (amongst other things) if there is a bad connection
>>somewhere
>>on the laptop's USB port hardware that is stopping it from being able to
>>deliver enough power to 'start' the wireless adaptor, but is still capable
>>of delivering sufficient to be able to run flash drives.
>
> I don't think that's happening. I've seen broken connectors and blown
> fuses on USB devices. The usual result is an all or nothing affair.
> It either works, or it doesn't. There's too much data negotiation and
> error checking going on for anything to partially fail in the manner
> you're experiencing.
>
>>(I have had a look at opening up the laptop to get at the port assembly
>>and
>>check its contacts, but it seems to be very difficult to get at, requiring
>>just about every other component to be removed first.)
>
> Dell Inspiron 2600 as I recall. It's not listed here:
> <http://repair4laptop.org/disassembly_dell.html>
> You should be able to find disassembly instructions in the docs on the
> Dell web pile. Bug me if you can't find them. I don't think you'll
> be able to see the connections to the main PCB as many such USB
> connectors are surface soldered. The better ones use plated through
> holes in the PCB. With these, the leads are under the connector and
> difficult to see.
>
> There are also dedicated USB test tools and software avaialable. I
> haven't used any. Search Google for "USB tester".
>
>
> --
> Jeff Liebermann jeffl@comix.santa-cruz.ca.us
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
<steve_a_hawkins@hotSPAMmail.com> wrote:
>I do have the laptop's service manual from Dell, and it doesn't say anything
>about the USB ports as such, but it is clear from the way the strip down is
>sequenced that these would be one of the last things to be uncovered - and I
>think I'd be quite likely to break something before I got that far!
No guts, no gain. By coincidence, I just tore apart an older Dell
Inspiron 8400 laptop down to the motherboard removal to replace the
power connector. Total time was 1.5 hour from start to finish
(ignoring a few interruptions). It's no big deal once you've done a
few of them. The most difficult problem is trying to remember the
location of the screws and fasteners. For that, I use my digital
camera. I take a photo of the top and bottom, print it on my
laserjunk printer, and push the screws through the paper in their
original location.
> http://www.devhardware.com/forums/st...10t-28266.html
>where quite a number of contributors do seem to be of the opinion that there
>was a problem with older boards not being able to cope with the power
>requirements of the later USB devices.
I've seen that with trying to power 2.5" laptop drives from the USB
port. At this very moment, I have a Toshiblah 80GB laptop drive
plugged into a USB2 to IDE adapter cable (very handy when it works).
Windoze Device Manager on my desktop reports 0ma of current drain from
the drive. Same garbage on an IBM A31 laptop. However, when I try it
on my ancient Micron laptop, I get the "cannot start error code 10"
message, which just means that the USB ports in the Micron are a
problem. My guess(tm) is that the USB standard demands that during
initialization, the USB device should suck 100ma or less. Few devices
do this, especially this hard disk trying to start. So, the older USB
ports and chips are picky and enforce the standard while the newer USB
ports and chips are more tolerance of abuse to the USB specification
and tolerate the high startup current. I have a butchered USB cable
(somewhere) setup to measure the device current, but no Buffalo USB
adapter to test.
>This is getting me increasingly
>confident that this really must be the cause, and I suspect that your
>original idea of obtaining a USB2 card may be the way forward.
Yet another coincidence. The IBM A31 laptop has USB 1.1 ports only.
So, I purchased a Sabrent SBT-P2D PCMCIA to USB2 cardbus thing. The
customer uses it mostly for backup to an external USB hard disk, but
normally has a large number of USB devices (9?) plugged into various
USB hubs connected to the card. Without USB 2.0, his laptop ran at
the speed of sludge.
>One thing to
>clear up: will the laptop be able to deliver power to the USB2 card any
>better than it could to the old USB2 ports; and if not would a wireless
>adaptor CARD be likely to fare any better than the USB adaptor has?
I'm not sure if the problem is whether the port can deliver the power,
or whether the port is shutting down to soon from overload. I think
you would be better off power wise with a PCMCIA USB2 card. 2nd best
would be a *POWERED* USB hub. The main reason I suggested the card is
to be able to use your Buffalo wireless device at 54Mbits/sec, instead
of being stuck at 11Mbits/sec max with USB 1.1.
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
More useful thoughts Jeff,
If twere my own laptop and I was convinced that I would be likely to find
and solve the problem by the strip down I would go ahead (And certainly
digital cameras do make it wonderfully easy to document a strip down and
make one's own workshp manual as it were - years ago I rebuilt an automatic
gearbox without a manual and had to draw every part as I went along, and
make my own special tools!), but as this particular laptop is on long term
loan, and the omens are that the problem is inheirent in the system, I think
the other alternatives you suggest will be safer.
What would you think of the combination of wireless PCMCIA CARD, and
separate powered hub? Obviously a heavier/bulkier combination to carry
around than the USB2 card and USB wireless adaptor, but would the extra
power be an advantage over trying to drive devices via the laptop's supply?
Also, I had a brief Googling on USB PCMCIA cards, and there seems to be an
enormous range, both in numbers of ports and in prices. Is more expensive
better? Is more ports better? (I have my mini extension hub after all.)
Thanks as always,
S
"Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
news:7rf1v2hnj35mnk4ntpecobpk59b56914v3@4ax.com...
> On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
> <steve_a_hawkins@hotSPAMmail.com> wrote:
>
>>I do have the laptop's service manual from Dell, and it doesn't say
>>anything
>>about the USB ports as such, but it is clear from the way the strip down
>>is
>>sequenced that these would be one of the last things to be uncovered - and
>>I
>>think I'd be quite likely to break something before I got that far!
>
> No guts, no gain. By coincidence, I just tore apart an older Dell
> Inspiron 8400 laptop down to the motherboard removal to replace the
> power connector. Total time was 1.5 hour from start to finish
> (ignoring a few interruptions). It's no big deal once you've done a
> few of them. The most difficult problem is trying to remember the
> location of the screws and fasteners. For that, I use my digital
> camera. I take a photo of the top and bottom, print it on my
> laserjunk printer, and push the screws through the paper in their
> original location.
>
>>
>> http://www.devhardware.com/forums/st...10t-28266.html
>>where quite a number of contributors do seem to be of the opinion that
>>there
>>was a problem with older boards not being able to cope with the power
>>requirements of the later USB devices.
>
> I've seen that with trying to power 2.5" laptop drives from the USB
> port. At this very moment, I have a Toshiblah 80GB laptop drive
> plugged into a USB2 to IDE adapter cable (very handy when it works).
> Windoze Device Manager on my desktop reports 0ma of current drain from
> the drive. Same garbage on an IBM A31 laptop. However, when I try it
> on my ancient Micron laptop, I get the "cannot start error code 10"
> message, which just means that the USB ports in the Micron are a
> problem. My guess(tm) is that the USB standard demands that during
> initialization, the USB device should suck 100ma or less. Few devices
> do this, especially this hard disk trying to start. So, the older USB
> ports and chips are picky and enforce the standard while the newer USB
> ports and chips are more tolerance of abuse to the USB specification
> and tolerate the high startup current. I have a butchered USB cable
> (somewhere) setup to measure the device current, but no Buffalo USB
> adapter to test.
>
>>This is getting me increasingly
>>confident that this really must be the cause, and I suspect that your
>>original idea of obtaining a USB2 card may be the way forward.
>
> Yet another coincidence. The IBM A31 laptop has USB 1.1 ports only.
> So, I purchased a Sabrent SBT-P2D PCMCIA to USB2 cardbus thing. The
> customer uses it mostly for backup to an external USB hard disk, but
> normally has a large number of USB devices (9?) plugged into various
> USB hubs connected to the card. Without USB 2.0, his laptop ran at
> the speed of sludge.
>
>>One thing to
>>clear up: will the laptop be able to deliver power to the USB2 card any
>>better than it could to the old USB2 ports; and if not would a wireless
>>adaptor CARD be likely to fare any better than the USB adaptor has?
>
> I'm not sure if the problem is whether the port can deliver the power,
> or whether the port is shutting down to soon from overload. I think
> you would be better off power wise with a PCMCIA USB2 card. 2nd best
> would be a *POWERED* USB hub. The main reason I suggested the card is
> to be able to use your Buffalo wireless device at 54Mbits/sec, instead
> of being stuck at 11Mbits/sec max with USB 1.1.
>
> --
> # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
> # 831-336-2558 jeffl@comix.santa-cruz.ca.us
> # http://802.11junk.comjeffl@cruzio.com
> # http://www.LearnByDestroying.com AE6KS
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Oops!
Sorry Jeff: you already told me: a powered hub would still leave me
communicating at USB1.1 with the laptop itself.
I'd still appreciate your advice on choosing the right card though.
Cheers,
S
"Steve H" <steve_a_hawkins@hotSPAMmail.com> wrote in message
news:OvdIh.17567$Fg4.2622@newsfe5-win.ntli.net...
> More useful thoughts Jeff,
>
> If twere my own laptop and I was convinced that I would be likely to find
> and solve the problem by the strip down I would go ahead (And certainly
> digital cameras do make it wonderfully easy to document a strip down and
> make one's own workshp manual as it were - years ago I rebuilt an
> automatic gearbox without a manual and had to draw every part as I went
> along, and make my own special tools!), but as this particular laptop is
> on long term loan, and the omens are that the problem is inheirent in the
> system, I think the other alternatives you suggest will be safer.
>
> What would you think of the combination of wireless PCMCIA CARD, and
> separate powered hub? Obviously a heavier/bulkier combination to carry
> around than the USB2 card and USB wireless adaptor, but would the extra
> power be an advantage over trying to drive devices via the laptop's
> supply?
>
> Also, I had a brief Googling on USB PCMCIA cards, and there seems to be an
> enormous range, both in numbers of ports and in prices. Is more expensive
> better? Is more ports better? (I have my mini extension hub after all.)
>
> Thanks as always,
>
> S
>
>
> "Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
> news:7rf1v2hnj35mnk4ntpecobpk59b56914v3@4ax.com...
>> On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
>> <steve_a_hawkins@hotSPAMmail.com> wrote:
>>
>>>I do have the laptop's service manual from Dell, and it doesn't say
>>>anything
>>>about the USB ports as such, but it is clear from the way the strip down
>>>is
>>>sequenced that these would be one of the last things to be uncovered -
>>>and I
>>>think I'd be quite likely to break something before I got that far!
>>
>> No guts, no gain. By coincidence, I just tore apart an older Dell
>> Inspiron 8400 laptop down to the motherboard removal to replace the
>> power connector. Total time was 1.5 hour from start to finish
>> (ignoring a few interruptions). It's no big deal once you've done a
>> few of them. The most difficult problem is trying to remember the
>> location of the screws and fasteners. For that, I use my digital
>> camera. I take a photo of the top and bottom, print it on my
>> laserjunk printer, and push the screws through the paper in their
>> original location.
>>
>>>
>>> http://www.devhardware.com/forums/st...10t-28266.html
>>>where quite a number of contributors do seem to be of the opinion that
>>>there
>>>was a problem with older boards not being able to cope with the power
>>>requirements of the later USB devices.
>>
>> I've seen that with trying to power 2.5" laptop drives from the USB
>> port. At this very moment, I have a Toshiblah 80GB laptop drive
>> plugged into a USB2 to IDE adapter cable (very handy when it works).
>> Windoze Device Manager on my desktop reports 0ma of current drain from
>> the drive. Same garbage on an IBM A31 laptop. However, when I try it
>> on my ancient Micron laptop, I get the "cannot start error code 10"
>> message, which just means that the USB ports in the Micron are a
>> problem. My guess(tm) is that the USB standard demands that during
>> initialization, the USB device should suck 100ma or less. Few devices
>> do this, especially this hard disk trying to start. So, the older USB
>> ports and chips are picky and enforce the standard while the newer USB
>> ports and chips are more tolerance of abuse to the USB specification
>> and tolerate the high startup current. I have a butchered USB cable
>> (somewhere) setup to measure the device current, but no Buffalo USB
>> adapter to test.
>>
>>>This is getting me increasingly
>>>confident that this really must be the cause, and I suspect that your
>>>original idea of obtaining a USB2 card may be the way forward.
>>
>> Yet another coincidence. The IBM A31 laptop has USB 1.1 ports only.
>> So, I purchased a Sabrent SBT-P2D PCMCIA to USB2 cardbus thing. The
>> customer uses it mostly for backup to an external USB hard disk, but
>> normally has a large number of USB devices (9?) plugged into various
>> USB hubs connected to the card. Without USB 2.0, his laptop ran at
>> the speed of sludge.
>>
>>>One thing to
>>>clear up: will the laptop be able to deliver power to the USB2 card any
>>>better than it could to the old USB2 ports; and if not would a wireless
>>>adaptor CARD be likely to fare any better than the USB adaptor has?
>>
>> I'm not sure if the problem is whether the port can deliver the power,
>> or whether the port is shutting down to soon from overload. I think
>> you would be better off power wise with a PCMCIA USB2 card. 2nd best
>> would be a *POWERED* USB hub. The main reason I suggested the card is
>> to be able to use your Buffalo wireless device at 54Mbits/sec, instead
>> of being stuck at 11Mbits/sec max with USB 1.1.
>>
>> --
>> # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
>> # 831-336-2558 jeffl@comix.santa-cruz.ca.us
>> # http://802.11junk.comjeffl@cruzio.com
>> # http://www.LearnByDestroying.com AE6KS
>
>
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
More gleanings from the customer comments under a number of PCMCIA/USB2
adaptor cards:
A number of these cards come with their own power supply or a socket for
one;
There are many comments as to devices being unable to start without an
additional power supply;
One commenter points out that the 'PCMCIA bus' is limited to 100ma and
cannot deliver the 500 associated with a normal USB port.
Looks rather likely that my Buffalo adaptor is not going to work in a USB2
adaptor card without an external supply, so it will not be a portable
solution after all.
Now, does this 100ma limit mean that this laptop might not even power a
PCMCIA wireless card...
S
"Steve H" <steve_a_hawkins@hotSPAMmail.com> wrote in message
news:IGdIh.1142$xE1.1051@newsfe7-win.ntli.net...
> Oops!
> Sorry Jeff: you already told me: a powered hub would still leave me
> communicating at USB1.1 with the laptop itself.
> I'd still appreciate your advice on choosing the right card though.
>
> Cheers,
> S
>
> "Steve H" <steve_a_hawkins@hotSPAMmail.com> wrote in message
> news:OvdIh.17567$Fg4.2622@newsfe5-win.ntli.net...
>> More useful thoughts Jeff,
>>
>> If twere my own laptop and I was convinced that I would be likely to find
>> and solve the problem by the strip down I would go ahead (And certainly
>> digital cameras do make it wonderfully easy to document a strip down and
>> make one's own workshp manual as it were - years ago I rebuilt an
>> automatic gearbox without a manual and had to draw every part as I went
>> along, and make my own special tools!), but as this particular laptop is
>> on long term loan, and the omens are that the problem is inheirent in the
>> system, I think the other alternatives you suggest will be safer.
>>
>> What would you think of the combination of wireless PCMCIA CARD, and
>> separate powered hub? Obviously a heavier/bulkier combination to carry
>> around than the USB2 card and USB wireless adaptor, but would the extra
>> power be an advantage over trying to drive devices via the laptop's
>> supply?
>>
>> Also, I had a brief Googling on USB PCMCIA cards, and there seems to be
>> an enormous range, both in numbers of ports and in prices. Is more
>> expensive better? Is more ports better? (I have my mini extension hub
>> after all.)
>>
>> Thanks as always,
>>
>> S
>>
>>
>> "Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
>> news:7rf1v2hnj35mnk4ntpecobpk59b56914v3@4ax.com...
>>> On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
>>> <steve_a_hawkins@hotSPAMmail.com> wrote:
>>>
>>>>I do have the laptop's service manual from Dell, and it doesn't say
>>>>anything
>>>>about the USB ports as such, but it is clear from the way the strip down
>>>>is
>>>>sequenced that these would be one of the last things to be uncovered -
>>>>and I
>>>>think I'd be quite likely to break something before I got that far!
>>>
>>> No guts, no gain. By coincidence, I just tore apart an older Dell
>>> Inspiron 8400 laptop down to the motherboard removal to replace the
>>> power connector. Total time was 1.5 hour from start to finish
>>> (ignoring a few interruptions). It's no big deal once you've done a
>>> few of them. The most difficult problem is trying to remember the
>>> location of the screws and fasteners. For that, I use my digital
>>> camera. I take a photo of the top and bottom, print it on my
>>> laserjunk printer, and push the screws through the paper in their
>>> original location.
>>>
>>>>
>>>> http://www.devhardware.com/forums/st...10t-28266.html
>>>>where quite a number of contributors do seem to be of the opinion that
>>>>there
>>>>was a problem with older boards not being able to cope with the power
>>>>requirements of the later USB devices.
>>>
>>> I've seen that with trying to power 2.5" laptop drives from the USB
>>> port. At this very moment, I have a Toshiblah 80GB laptop drive
>>> plugged into a USB2 to IDE adapter cable (very handy when it works).
>>> Windoze Device Manager on my desktop reports 0ma of current drain from
>>> the drive. Same garbage on an IBM A31 laptop. However, when I try it
>>> on my ancient Micron laptop, I get the "cannot start error code 10"
>>> message, which just means that the USB ports in the Micron are a
>>> problem. My guess(tm) is that the USB standard demands that during
>>> initialization, the USB device should suck 100ma or less. Few devices
>>> do this, especially this hard disk trying to start. So, the older USB
>>> ports and chips are picky and enforce the standard while the newer USB
>>> ports and chips are more tolerance of abuse to the USB specification
>>> and tolerate the high startup current. I have a butchered USB cable
>>> (somewhere) setup to measure the device current, but no Buffalo USB
>>> adapter to test.
>>>
>>>>This is getting me increasingly
>>>>confident that this really must be the cause, and I suspect that your
>>>>original idea of obtaining a USB2 card may be the way forward.
>>>
>>> Yet another coincidence. The IBM A31 laptop has USB 1.1 ports only.
>>> So, I purchased a Sabrent SBT-P2D PCMCIA to USB2 cardbus thing. The
>>> customer uses it mostly for backup to an external USB hard disk, but
>>> normally has a large number of USB devices (9?) plugged into various
>>> USB hubs connected to the card. Without USB 2.0, his laptop ran at
>>> the speed of sludge.
>>>
>>>>One thing to
>>>>clear up: will the laptop be able to deliver power to the USB2 card any
>>>>better than it could to the old USB2 ports; and if not would a wireless
>>>>adaptor CARD be likely to fare any better than the USB adaptor has?
>>>
>>> I'm not sure if the problem is whether the port can deliver the power,
>>> or whether the port is shutting down to soon from overload. I think
>>> you would be better off power wise with a PCMCIA USB2 card. 2nd best
>>> would be a *POWERED* USB hub. The main reason I suggested the card is
>>> to be able to use your Buffalo wireless device at 54Mbits/sec, instead
>>> of being stuck at 11Mbits/sec max with USB 1.1.
>>>
>>> --
>>> # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
>>> # 831-336-2558 jeffl@comix.santa-cruz.ca.us
>>> # http://802.11junk.comjeffl@cruzio.com
>>> # http://www.LearnByDestroying.com AE6KS
>>
>>
>
>
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
On Fri, 09 Mar 2007 16:44:57 GMT, "Steve H"
<steve_a_hawkins@hotSPAMmail.com> wrote:
>One commenter points out that the 'PCMCIA bus' is limited to 100ma and
>cannot deliver the 500 associated with a normal USB port.
You missed a decimal point.
It's 1000ma per card. However, the recomended continuous power drain
is 500ma total per card. See:
<http://www.pcmcia.org/faq.htm#power>
What power is available to a PC Card slot?
The PC Card connector pins are rated to a maximum of 0.5 A per pin,
which means the maximum possible current available over the two Vcc
pins is 1000 mA. However, the Host System Specification chapter of the
PC Card Standard set a recommended minimum current per slot, which is
the most any PC Card card designer should expect to be provided by a
host slot. PC Cards requiring more current than the host minimum
recommended support values may not be powered properly in all systems.
Type 3.3 V Value 5.0 V Value
Peak 1000 mA 660 mA
Average 750 mA 500 mA
Static 500 mA 330 mA
Most modern laptops are 3.3VDC.
That's means that a two port PCMCIA USB card can source 500ma per
port, but the recommended maximum is 500ma total divided between the
two ports.
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
<steve_a_hawkins@hotSPAMmail.com> wrote in
<qTZHh.865$xE1.629@newsfe7-win.ntli.net>:
>... One thing to
>clear up: will the laptop be able to deliver power to the USB2 card any
>better than it could to the old USB2 ports; and if not would a wireless
>adaptor CARD be likely to fare any better than the USB adaptor has?
Better USB 2 PC Cards use external power supplies.
--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Thus it is begining to look as if I won't be able to reliably use the laptop
on USB2 devices or devices that need more power than the minimum, unless I
buy another device that needs mains power. thereby nullifying the point of
the laptop in the first place...
Mind u,
As it appears that as Jeff has noted, a 0 was left off the power
capabilities of PCMCIA bus info I had found, then this would appear to make
it more likely than the laptop may power a wireless PCMCIA card directly.
Still not sure about buying either this or the USB adaptors though, as in
all the comments from customers - on sites that provide them - there appear
to be somewhat similar stories to my own, with them only working for some
devices. I have not, as yet found any customer reviews of the wireless cards
(Buffalo at least), to be able to tell whether there are similar
'unrecognized' problems with these as well.
Anyhow,
Thanks both of you for all your research on my behalf.
Cheers,
S
"John Navas" <spamfilter1@navasgroup.com> wrote in message
news:2u14v2punnfmaq06lc2cpcndmino9mspu8@4ax.com...
> On Thu, 08 Mar 2007 19:56:06 GMT, "Steve H"
> <steve_a_hawkins@hotSPAMmail.com> wrote in
> <qTZHh.865$xE1.629@newsfe7-win.ntli.net>:
>
>>... One thing to
>>clear up: will the laptop be able to deliver power to the USB2 card any
>>better than it could to the old USB2 ports; and if not would a wireless
>>adaptor CARD be likely to fare any better than the USB adaptor has?
>
> Better USB 2 PC Cards use external power supplies.
>
> --
> Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
> John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
> Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
> Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>
>Thus it is begining to look as if I won't be able to reliably use the laptop
>on USB2 devices or devices that need more power than the minimum, unless I
>buy another device that needs mains power. thereby nullifying the point of
>the laptop in the first place...
Well, you could just buy a PCMCIA 802.11g wireless device instead of
messing with the USB problems.
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Or could I? As I noted it does not look certain that the laptop would power
even this device, though Jeff's 1000ma assurance makes this more likely?
Worth a try though...
S
"Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
news:rqq5v25v8r3dhppuo6k6dnivta94ihh6tn@4ax.com...
> "Steve H" <steve_a_hawkins@hotSPAMmail.com> hath wroth:
>
>>Thus it is begining to look as if I won't be able to reliably use the
>>laptop
>>on USB2 devices or devices that need more power than the minimum, unless I
>>buy another device that needs mains power. thereby nullifying the point of
>>the laptop in the first place...
>
> Well, you could just buy a PCMCIA 802.11g wireless device instead of
> messing with the USB problems.
>
> --
> Jeff Liebermann jeffl@comix.santa-cruz.ca.us
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized'
Update,
Discovered that my pocket hub had a socket for a power supply that had not
been mentioned in the paperwork or spec, but FAQ on the Sitecom site told me
my old router's power supply should be the right spec (5V 2.5A).
Initially powering up and plugging in the wirelsss adaptor looked promising,
with the Buffalo showning up correctly in device manager, but several goes
at starting the connection later it just popped up with the same 'error code
10' as before, and then dropped out to the yellow triangle, and then 'device
unrecognized as before.
Interestingly, even when the device appeared correctly in device manager, it
did not show up as the latest connection of said device in USBDeview?
As always, the adaptor continues to work just fine in the pc...
?
Cheers,
S
"Steve H" <steve_a_hawkins@hotSPAMmail.com> wrote in message
news:o5CIh.50382$3a3.6344@newsfe6-win.ntli.net...
> Or could I? As I noted it does not look certain that the laptop would
> power even this device, though Jeff's 1000ma assurance makes this more
> likely? Worth a try though...
>
> S
>
>
> "Jeff Liebermann" <jeffl@comix.santa-cruz.ca.us> wrote in message
> news:rqq5v25v8r3dhppuo6k6dnivta94ihh6tn@4ax.com...
>> "Steve H" <steve_a_hawkins@hotSPAMmail.com> hath wroth:
>>
>>>Thus it is begining to look as if I won't be able to reliably use the
>>>laptop
>>>on USB2 devices or devices that need more power than the minimum, unless
>>>I
>>>buy another device that needs mains power. thereby nullifying the point
>>>of
>>>the laptop in the first place...
>>
>> Well, you could just buy a PCMCIA 802.11g wireless device instead of
>> messing with the USB problems.
>>
>> --
>> Jeff Liebermann jeffl@comix.santa-cruz.ca.us
>> 150 Felker St #D http://www.LearnByDestroying.com
>> Santa Cruz CA 95060 http://802.11junk.com
>> Skype: JeffLiebermann AE6KS 831-336-2558
>
>
Re: BUFFALO WLI-U2-KG54-AI USB adaptor stopped being 'recognized' 
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