[c-nsp] Cisco 877 config for Telefonica

[Tom Storey]

> The 877-K9's I've been ordering for the last year have supported ADSL2
> without an issue IIRC.
>
> Cheers,
>
> Will
>

Any recent IOS image will support ADSL2/2+. There was a certain IOS
version (mid 2006ish?) where the 877's moved from ADSL1 only to ADSL1/2/2+
but I cant recall off the top of my head.

The 877-M supports Annex M, providing higher upload speeds, but requires
the DSLAM to also support and allow Annex M. e.g. I have an ADSL2+ service
at home synced at 16mbit down by 2.5mbit up.