My understanding of this is that they will activate the second pair that is
commonly used in the RJ-43 port in your wall. This will allow 2 lines
active to the device.

Changes inside might need to happen if your residence does not have 4 wire
(2 line) compatibility. (IE 2 pairs to the jack vs 1 pair)

On Thu, Aug 6, 2020 at 9:10 PM Jim via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:

> Where I live, I get AT&T for my DSL service.  I've signed up for an
> upgrade from 10 Mbps to 25.  I finally got someone there who would tell
> me why a technician visit is required for the upgrade. They're bonding 2
> pairs to supply the faster speed here.  I've read up online about DSL
> bonding.  I understand that one pair will carry some of the data, and
> the other pair will carry some.  But one thing I didn't find out was
> whether or not anything will change between the wall jack and the
> modem.  Is everything done outside or do they have to come inside?  I
> currently have a 2 conductor cord connecting my modem to the wall jack.
> Will that have to be replaced with a 4 conductor cord?  Do they install
> an extra box outside or inside?  I guess all will be answered on the
> 18th when the guy is scheduled to be here.   I'm really curious how this
> works.
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen