33 Years of the Digest ... founded August 21, 1981Copyright © 2014 E. William Horne. All Rights Reserved.The Telecom Digest for Dec 4, 2014
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| Date: Wed, 03 Dec 2014 17:29:16 +1100 From: David Clayton <dc33box-usenet2@NOSPAM.yahoo.com.au> To: telecomdigestsubmissions.remove-this@and-this-too.telecom-digest.org. Subject: Re: Majic Jack Go Power Issue Message-ID: <pan.2014.12.03.06.29.13.34414@NOSPAM.yahoo.com.au> On Tue, 02 Dec 2014 03:56:12 +0000, John Levine wrote: >> The power supply plugs into a standard AC receptacle (110VAC). The >>Magic Jack Go plugs into the power supply via a USB port. > > That's quite peculiar. If it uses a normal mini- or micro-USB connector, > you might try plugging it into a cell phone charger, which is supposed to > provide the same voltage on the same connector, and see what happens. .......... Be aware that newer USB devices - like USB 3 external drives - draw a lot more current than the old USB2 ports can supply to work correctly. It is quite possible that this device draws a lot more current than the standard USB2 port can supply and requires either an external USB3 spec PSU or a USB3 port that has sufficient grunt. -- Regards, David. David Clayton Melbourne, Victoria, Australia. Knowledge is a measure of how many answers you have, intelligence is a measure of how many questions you have. ***** Moderator's Note ***** "Grunt"? Don't you mean "Strap"? ;-) Bill Horne Moderator |
| Date: Thu, 04 Dec 2014 09:33:18 +1100 From: David Clayton <dc33box-usenet2@NOSPAM.yahoo.com.au> To: telecomdigestsubmissions.remove-this@and-this-too.telecom-digest.org. Subject: Re: Majic Jack Go Power Issue Message-ID: <pan.2014.12.03.22.33.14.820707@NOSPAM.yahoo.com.au> On Wed, 03 Dec 2014 17:29:16 +1100, David Clayton wrote: > On Tue, 02 Dec 2014 03:56:12 +0000, John Levine wrote: > >>> The power supply plugs into a standard AC receptacle (110VAC). The >>>Magic Jack Go plugs into the power supply via a USB port. >> >> That's quite peculiar. If it uses a normal mini- or micro-USB >> connector, you might try plugging it into a cell phone charger, which is >> supposed to provide the same voltage on the same connector, and see what >> happens. > > Be aware that newer USB devices - like USB 3 external drives - draw a lot > more current than the old USB2 ports can supply to work correctly. Just to add a bit more context, if you add a USB3 card into a PC you will notice that you have to make a direct connection to the PSU as the PCI motherboard bus that the card plugs into cannot supply sufficient current for the USB3 standard where older USB2 cards did not need this extra connection. People who forget to plug the power cable in have a device that is usually detected by the OS by mysteriously does not work when a USB3 only device is plugged into it. The newer USB3.1 standard delivers even more current, how they expect the now tiny USB connectors that are becoming common on new devices to handle this high current has me baffled. I fully expect that in the near future a common fault in phones and other USB devices will be burnt out connectors as continually plugging and unplugging something that might have 5A running through it will just eventually kill them. Good business for repairing or replacing the devices, I suppose. -- Regards, David. David Clayton Melbourne, Victoria, Australia. Knowledge is a measure of how many answers you have, intelligence is a measure of how many questions you have. |
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