OT: DSL/Modems

[Fairlight]

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).

We had the -worst- infrastructure around here for the longest time.  It's
bizarre.  The general manager of my ISP always said all my problems would
go away when I went digital.  I had no end of trouble with DSL the first
week--including my own stupidity for having a caller ID box that was missed
in the filtering because I'd done it at the devices rather than at the wall
before the splitter.  I literally had an inverted rate where I'd get 27KB/s
up, but 2-4KB/sec down--in fits and starts, 10KB/s being the best I could
get.  It was abysmal until I found that rogue device.

The solution is to just filter -at the jack-, and then any devices, no
matter how many splitters you use after that, are covered.  I have a v.90
and a phone back here, and a phone out in the living room on the modem
itself.  All work fine, and my DSL does not suffer.

And...when they fixed that hard ground after the storms a few months back,
they fixed the infrastructure around here, all externally--it was nothing
to do with my internal wiring.  I went from an average -best- of 109KB/sec
up to an average of 147KB/sec, with a max of 153.37KB/sec recorded.  That's
about as high as I'm going to get on DSL unless I shift to 3mbit.  And my
uplink dropped about 2KB/sec to an average of 25KB/sec.  I can live with
that. It's > 5x dialup speed. 

But I've had occasion to be on DSL and dial into a remote system--even
within the last week.  Zero problems.

> There really is no problem >IF< you install things properly.
 
And make -sure- you haven't missed anything.

> Since DSL uses high-frequency signals and modems and FAX and voice
> use low frequency there is no problem with them - again IF you
> install them properly.  There is no difference between a modem
> or fax and voice on a DSL.

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.

mark->
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