[c-nsp] DSL signals vs DOCSIS

[Yuri Bank]

I understand that they use different frequency ranges, but why can't the DSL
freqencies be converted and sent over fiber somewhere between the CPE and
the DSLAM ?

On Thu, Dec 10, 2009 at 11:41 PM, Dmitry Kiselev <dmitry at dmitry.net> wrote:

> Hello!
>
> On Thu, Dec 10, 2009 at 08:48:27PM -0800, Yuri Bank wrote:
>
> > Why can't DSL signals pass through fiber optics, yet we have HFC networks
> > that obviously have no issues going from copper to fiber.
> > The modulation techniques DOCSIS and DSL use are similar, so what
> prevents
> > this from working with DSL? Is it that the RF is to weak and the
> conversion
> > process messes up the signal?
>
> It is becouse very different frequency ranges:
> DSL   0.02-1.1 MHz for both up and downstreams
> DOCSIS   16-30 MHz for upstream
>         50-800 MHz for downstream
>
> --
> Dmitry Kiselev
>