-----Original Message-----
From: Steven Perich [mailto:steve@clubpoint.co.nz]
Sent: Monday, 7 October 2002 12:38 p.m.
To: David Mill; adsl@lists.unixathome.org
Subject: Re: dsl service in Manurewa

> How does one typically determine the "distance" anyway from the exchange
to
> a house? Do people normally go as the eagle flies, or by traversal of
roads?
> I would think the most accurate way to judge the distance is the line
> distance - ie the copper pair that goes from your house, to a repeater box
> down the street (in the opposite direction to the exchange), and back from
> that repeater box (probably digital, too) back to the exchange.
>
> If your experience dictates that 3.5km is a high distance for ADSL to work
> effectively, does that mean from the house to the repeater box, or house
to
> the exchange, or both? Surely 90% of the population wouldn't be able to
get
> ADSL if both?

The distance is worked out by Telecom, by tracing along the wiring that
leads back to the exchange. Normally this wiring would follow streets, so
you could class the distance as being the distance it takes to drive from
your house to the closest phone exchange. This will also be the exchange
that your phone in connected to, which is not always the closest exchange.

Before people say bulls**t, Telecom dont do this, I believe that they do. I
have been on the phone to numerous Telecom people whilst they bring out
there maps of the area and do a trace back to the exchange.

> > BTW, I am told that he main problems with Internal modems is that fact
that
> > they draw their power source from the already overloads PSU in your
> > computer, rather than having a seperate power source. This causes
problems
> > both when far away from an exchange, plus when you are too close to an
> > exchange.

> PSU? overloaded? Psaw! I don't think it's a lack of power at all that
causes
> internal modems to be less reliable, it's more that they are sitting in a
> large metal box, sharing power with several other devices, and absorbing
> electrical interference from them, as opposed to being in their own case
> with their own power source..

To quote from Mark "- PCI and USB are not suited for long distance
connectivity due to power
issues, they cant throw as strong a signal down the line due to limitations
from the PCI Rails / USB Cable." - I think his quote has a lot more truth in
it than mine, mine was over-simplifying/stating the issue.

Regards,

Dave

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