[c-nsp] DSL signals vs DOCSIS

[Dmitry Kiselev]

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