Re: home router battery backup

[Jeff Shultz <jeffshultz () sctcweb com>]

+180v and -180v for a total of 360v. At really low amperage. Still makes a
respectable bang if you short it on the MDF. It gets converted on-site,
either in the DSLAM or in a separate box. I think it's 12v to the ONT.

On Mon, Jan 17, 2022 at 3:30 PM Michael Thomas <mike () mtcc com> wrote:

> On 1/17/22 2:39 PM, Jordan wrote:
> > On Thu, Jan 13, 2022 at 02:06:39PM -0800, Michael Thomas wrote:
> > > For my ISP, they maintain backup power for both DSL and POTS.  I
> > > suspect that for a lot of DSL that would hold true because it's
> > > relatively easy for them to power since they already have the
> > > battery backup requirements for POTS.  The setup they have here
> > > is a DSLAM and SIP->POTS termination in a pedestal with fiber
> > > backhaul.  They use the old copper that used to go back to the CO
> > > to power the pedestal.
> > Do you happen to know what voltage is placed across the copper pairs
> > for this purpose?  Maybe 130V like T1 span repeaters?  More?
> >
> > I used to have three POTS lines at home from BellSouth, before the
> > AT&T acquisition, with DSL on one of them, all supposedly served
> > from the same Lucent SLC.  One of these, the one originally used
> > for DSL, would always go down for both voice and data when the SLC
> > lost power-- no DC, no dialtone, no DSL, while the other two
> > remained up.  Despite several claims of a resolution, this was
> > never properly fixed, so eventually I just had them move DSL over
> > to one of the unaffected lines.
> >
> > I could never understand what failure mode would result in losing
> > just a single POTS line like this while the carrier equipment was
> > running from battery, while others remained in service.
> > Speculating, perhaps only the A or B-side was backed up, and an
> > open diode or other defect caused a single ine card to draw only
> > from the "other" source?  But, at this time (circa 2000) the remote
> > DSLAM was definitely a separate piece of equipment, right, joined
> > to a shared subscriber pair with passive splitters?
>
> I have absolutely no idea, but if I had to guess it is the same voltage
> as the local loop but I suppose they could use ring voltage too.
>
> Mike, definitely not a EE

-- 
Jeff Shultz

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