OT: DSL/Modems

[Bill Vermillion]

In the last exciting episode of the filePro saga, 
Fairlight was heard to say:" 
if: Sun, Oct 24 17:18  
then: nm = Fairlight 
if:
then: show nm < "said:"  
Fairlight said: 

> The honourable and venerable Bill Vermillion spoke thus:
> > On Sun, Oct 24 15:12 , GCC Consulting gie sprachen "Vyizdur zomen 
> > emororz izaziz zander izorziz", and continued with: 

> > > Suggestion: DON'T SHARE A DIAL-UP MODEM ON A DSL LINE. This
> > > also means that FAX machines may have a problem.

> > > The above is more of a warning for those who may install a DSL
> > > line at home or in a small office.

> > The company I'm with was re-selling DSL for awhile.

> > Almost all your problems will be elminated if you put in
> > the recommended filter.

> I concur with Bill.  I have -zero- problems using my v.90 on top of my DSL
> line.  No DSL degradation, and the v.90 connects at higher rates than it
> ever did before with the filter in place (51200 instead of 46k-48k).

....


> Yeah. And if you -don't-, not only can you cause the high end
> frequencies to roll off and nuke your DSL to the point it will
> barely sync, but if you have it unfiltered, there's a -really-
> good chance you can hear a nice shrieking static at what I'd
> hazard a guess was about 15-20db on your voice circuit from the
> bleed-over at the circuit bridge. It's nasty, and it will make
> a modem (and even a phone) next to unusable. I've heard some
> people -can- get away with no filters, but it's not generally
> advisable.

And an interesting thing that can happen with DSL - since it
is a high-frequency signal - similar to RF - is that sometimes
you can lose your voice line - as there needs to be enough
conductivity to carry the voltages for ring, etc., - that the HF
will seem to bleed past LF impairments and the DSL will work
when the regular phone line wont.

I had that one time.

Bill
-- 
Bill Vermillion - bv @ wjv . com