[clug] USB ADSL2+ modem?

Scott Ferguson scott.ferguson.clug at gmail.com
Fri Dec 23 04:17:32 UTC 2016

On 20/12/16 12:13, Bob Edwards wrote:
> A new thread...
> I realise that ADSL/ADSL2/ADSL2+ has higher voltage requirements
> than can generally be met by USB/USB2/USB3, but not sure if that
> isn't a solvable problem that might already have been solved?
> I can't find anything on the interwebs that gives me much encouragement.
> Ideally, I would like to power my (bare/bridge) ADSL2+ modem from
> my laptop's power supply/battery and the obvious way to do that would
> be to use a USB-based modem.
> My (Linux) laptop would then do the rest and I can (trivially?) keep
> it patched etc. and keep a closer eye on what is really going back and
> forth on the ADSL connection...
> Anybody got any thoughts or recommendations?
> cheers,
> Bob Edwards.

I don't know of any that meet your specs - but they could exist... USB3
*will* give you 1500MA 12V - but it's *very* unlikely you have a USB PDb
Modems I'm familiar with use 3.3 and 5V for signalling (well within the
specs of USB2 and the stock USB3 however see my note about negotiation),
but require 12V for the power supply. From memory the Cisco Multimode
ADSL2/2+/VDSL2 cards did around 25W max (12V), and the Viking ADSL2+ PCI
cards did 8W.
Even with a tripler your problem is going to be regulation as USB
requires negotiation - your modem won't do that.
You might be able to tap your hard drive PS though, simple if you've an
unused second bay.

Alternatively you could just buy a Geos1.1 ADSL2+ x86 router and install
the Linux of your choice. (9VDC)

Kind regards

Kind regards

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