Does an iPad or high power Android phone *need* a USB 3.0 ex

[Avraham Bernholz]

I wanted to extend the length of my charging cables.
So, I bought these USB 2.0 extension cables from Frys:
http://oi57.tinypic.com/30iamj5.jpg

When I got home, I realized that *maybe* USB 2.0 extensions
won't fully charge a 2.1 amp iPad (which uses the lightning cable)
or a 1.2 amp smartphone (which uses miniUSB connectors).

But I'm not sure...

I'm confused how the USB 2.0 versus USB 3.0 spec has to do
with the current that the device (wall charger or computer)
will give the iPad or smartphone in the specific case of
the USB extension cable.

So, fundamentally, I'm asking whether it matters when charging
a late-model iPad Air (lightning cable) or smartphone (Nexus 5)
whether I use a USB 2.0 or a USB 3.0 extension cable?

 

[Avraham Bernholz]

Whiskers wrote, on Thu, 21 Aug 2014 00:05:19 +0100:

You only need a USB 3.1 cable if the charger can produce up to 5 Amps at
either 12 Volts or 20 Volts (the two new higher power options permitted
by the USB 3.1 standard) *and* the thing you want to charge is capable
of demanding such higher power (so, only if your device and charger both
claim to be up to the USB 3.1 standard).

A USB 3 cable might not suffice in those circumstances.

Do I understand this to mean:
1. If I have a 12V/20V/5A wall charger USB 3.1 wall charger,
2. And, if my smart device is a USB 3.1 device,
3. Then (and only then), do I need a USB 3.1 cable
4. Otherwise, the USB 2.0 extension cable will work just fine.

Is that correct?

Likewise, since I have an iPad with Lightning cable, the
USB 2.0 extension cable will work just fine with that
Lightning cable.

Is that also correct?

 

[Rod Speed]

Avraham Bernholz <Avraham.Bernholz@gmail.com> wrote

> I wanted to extend the length of my charging cables.

I did that with my Logitech keyboard and mouse charging cable.

So, I bought these USB 2.0 extension cables from Frys:
http://oi57.tinypic.com/30iamj5.jpg

I used extension cables I got of ebay for peanuts.

When I got home, I realized that *maybe* USB 2.0 extensions
won't fully charge a 2.1 amp iPad (which uses the lightning cable)
or a 1.2 amp smartphone (which uses miniUSB connectors).

But I'm not sure...

Should be fine, the current is signalled by the resistance between
the power pins and the data pins with a charging cable and the
extension shouldn’t make any difference to that.

I'm confused how the USB 2.0 versus USB 3.0 spec has to do
with the current that the device (wall charger or computer)
will give the iPad or smartphone in the specific case of
the USB extension cable.

It doesn’t, USB 2.0 and 3.0 is an entirely separate issue to
how Samsungs and Apples indicate what current they want.

So, fundamentally, I'm asking whether it matters when charging
a late-model iPad Air (lightning cable) or smartphone (Nexus 5)
whether I use a USB 2.0 or a USB 3.0 extension cable?

Shouldn’t matter at all, USB 2.0 extensions should be fine as long as
there is enough metal in the wire so that you don’t see a lot of voltage
drop in the extension cable. And that isnt determined by the USB 2.0
and 3.0 spec anyway, its silent on the gauge of wire used.

 

[Whiskers]

["Followup-To:" header set to comp.mobile.android.]
On 2014-08-20, Avraham Bernholz <Avraham.Bernholz@gmail.com> wrote:

I wanted to extend the length of my charging cables.
So, I bought these USB 2.0 extension cables from Frys:
http://oi57.tinypic.com/30iamj5.jpg

When I got home, I realized that *maybe* USB 2.0 extensions
won't fully charge a 2.1 amp iPad (which uses the lightning cable)
or a 1.2 amp smartphone (which uses miniUSB connectors).

But I'm not sure...

I'm confused how the USB 2.0 versus USB 3.0 spec has to do
with the current that the device (wall charger or computer)
will give the iPad or smartphone in the specific case of
the USB extension cable.

So, fundamentally, I'm asking whether it matters when charging
a late-model iPad Air (lightning cable) or smartphone (Nexus 5)
whether I use a USB 2.0 or a USB 3.0 extension cable?

The USB 3 standard says nothing about power capacity in excess of the
long established 0.9A 5V requirement.

USB 3.1 is the standard which allows for 'more power'.

You only need a USB 3.1 cable if the charger can produce up to 5 Amps at
either 12 Volts or 20 Volts (the two new higher power options permitted
by the USB 3.1 standard) *and* the thing you want to charge is capable
of demanding such higher power (so, only if your device and charger both
claim to be up to the USB 3.1 standard).

A USB 3 cable might not suffice in those circumstances.

Plugging a USB 3 or USB 3.1 cable into a basic 1 Amp, 5 Volt, USB
charger won't make it any 'quicker' or 'more powerful'. Likewise, a 2A
5V charger will still only provide up to 2A 5V

--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~

 

[John G]

After serious thinking Zaidy036 wrote :

On 8/20/2014 8:38 PM, Avraham Bernholz wrote:
Whiskers wrote, on Thu, 21 Aug 2014 00:05:19 +0100:

You only need a USB 3.1 cable if the charger can produce up to 5 Amps at
either 12 Volts or 20 Volts (the two new higher power options permitted
by the USB 3.1 standard) *and* the thing you want to charge is capable
of demanding such higher power (so, only if your device and charger both
claim to be up to the USB 3.1 standard).

A USB 3 cable might not suffice in those circumstances.

Do I understand this to mean:
1. If I have a 12V/20V/5A wall charger USB 3.1 wall charger,
2. And, if my smart device is a USB 3.1 device,
3. Then (and only then), do I need a USB 3.1 cable
4. Otherwise, the USB 2.0 extension cable will work just fine.

Is that correct?

Likewise, since I have an iPad with Lightning cable, the
USB 2.0 extension cable will work just fine with that
Lightning cable.

Is that also correct?

It also depends on voltage supply at outlet - if below 120v then size of wire
may reduce voltage below what the device requires or cause very slow charging
even when device is off.

Pray tell! what has 120 volts got to do with the charger voltage?
Most chargers and wall warts these days are SMPS and regulate from
around 90 to 250 volts.

--
John G Sydney.

 

[Zaidy036]

On 8/20/2014 8:38 PM, Avraham Bernholz wrote:

Whiskers wrote, on Thu, 21 Aug 2014 00:05:19 +0100:

You only need a USB 3.1 cable if the charger can produce up to 5 Amps at
either 12 Volts or 20 Volts (the two new higher power options permitted
by the USB 3.1 standard) *and* the thing you want to charge is capable
of demanding such higher power (so, only if your device and charger both
claim to be up to the USB 3.1 standard).

A USB 3 cable might not suffice in those circumstances.

Do I understand this to mean:
1. If I have a 12V/20V/5A wall charger USB 3.1 wall charger,
2. And, if my smart device is a USB 3.1 device,
3. Then (and only then), do I need a USB 3.1 cable
4. Otherwise, the USB 2.0 extension cable will work just fine.

Is that correct?

Likewise, since I have an iPad with Lightning cable, the
USB 2.0 extension cable will work just fine with that
Lightning cable.

Is that also correct?

It also depends on voltage supply at outlet - if below 120v then size of
wire may reduce voltage below what the device requires or cause very
slow charging even when device is off.

 

[Rod Speed]

"Avraham Bernholz" <Avraham.Bernholz@gmail.com> wrote in message
news:lt3f2s$2nh$1@news.albasani.net...

Whiskers wrote, on Thu, 21 Aug 2014 00:05:19 +0100:

You only need a USB 3.1 cable if the charger can produce up to 5 Amps at
either 12 Volts or 20 Volts (the two new higher power options permitted
by the USB 3.1 standard) *and* the thing you want to charge is capable
of demanding such higher power (so, only if your device and charger both
claim to be up to the USB 3.1 standard).

A USB 3 cable might not suffice in those circumstances.

Do I understand this to mean:
1. If I have a 12V/20V/5A wall charger USB 3.1 wall charger,
2. And, if my smart device is a USB 3.1 device,
3. Then (and only then), do I need a USB 3.1 cable
4. Otherwise, the USB 2.0 extension cable will work just fine.

Is that correct?

Yes.

Likewise, since I have an iPad with Lightning cable, the
USB 2.0 extension cable will work just fine with that
Lightning cable.

Is that also correct?

Normally, but not necessarily always, particularly if its
a poor quality USB 2.0 extension cable that has very
thin wires that drop a significant voltage when the
ipad is getting the maximum current it ever takes.

 

[John Doe]

"Rod Speed" <rod.speed.aaa gmail.com> wrote:

Avraham Bernholz <Avraham.Bernholz gmail.com> wrote

I wanted to extend the length of my charging cables.

I did that with my Logitech keyboard and mouse charging cable.

So, I bought these USB 2.0 extension cables from Frys:
http://oi57.tinypic.com/30iamj5.jpg

I used extension cables I got of ebay for peanuts.

When I got home, I realized that *maybe* USB 2.0 extensions
won't fully charge a 2.1 amp iPad (which uses the lightning
cable) or a 1.2 amp smartphone (which uses miniUSB connectors).

But I'm not sure...

Should be fine, the current is signalled by the resistance
between the power pins and the data pins with a charging cable

That's gibberish. Apparently "signaled" means "determined". Who
knows what "the resistance between the power pins and the data
pins" is supposed to mean.

Anybody in the electronics repair group translate what "Rod Speed"
is saying?







--

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From: "Rod Speed" <rod.speed.aaa gmail.com
Newsgroups: comp.mobile.android,comp.mobile.ipad,sci.electronics.repair
Subject: Re: Does an iPad or high power Android phone *need* a USB 3.0 extension for full power charging?
Date: Thu, 21 Aug 2014 06:39:29 +1000
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[Mike Tomlinson]

En el artículo <lvmmjq$fs9$1@dont-email.me>, John Doe
<always.look@message.header> escribió:

Anybody in the electronics repair group translate what "Rod Speed"
is saying?

Rod talks bollocks, so you and he should get along just fine.

*plonk* again, crossposted groups trimmed

--
(\_/)
(='.'=)
(")_(")

 

[nospam]

In article <lvmmjq$fs9$1@dont-email.me>, John Doe
<always.look@message.header> wrote:

So, I bought these USB 2.0 extension cables from Frys:
http://oi57.tinypic.com/30iamj5.jpg

I used extension cables I got of ebay for peanuts.

When I got home, I realized that *maybe* USB 2.0 extensions
won't fully charge a 2.1 amp iPad (which uses the lightning
cable) or a 1.2 amp smartphone (which uses miniUSB connectors).

But I'm not sure...

Should be fine, the current is signalled by the resistance
between the power pins and the data pins with a charging cable

That's gibberish. Apparently "signaled" means "determined". Who
knows what "the resistance between the power pins and the data
pins" is supposed to mean.

Anybody in the electronics repair group translate what "Rod Speed"
is saying?

usb extension cables are non-compliant with the usb spec, which also
explains how the data pins communicate power between host and
peripheral.

 

[John Doe]

Telling the world about its imaginary kill file friend...

--
Mike Tomlinson <mike jasper.org.uk> wrote:

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Date: Sun, 21 Sep 2014 16:02:40 +0100
From: Mike Tomlinson <mike jasper.org.uk
Newsgroups: comp.mobile.android,comp.mobile.ipad,sci.electronics.repair
Subject: Re: Does an iPad or high power Android phone *need* a USB 3.0 extension for full power charging?
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En el artĄculo <lvmmjq$fs9$1 dont-email.me>, John Doe
always.look message.header> escribi˘:

Anybody in the electronics repair group translate what "Rod Speed"
is saying?

Rod talks bollocks, so you and he should get along just fine.

*plonk* again, crossposted groups trimmed

--
(\_/)
(='.'=)
(")_(")