On 2007-07-04 23:01:02 +0100, "dennis@home"
said:


"Andy Hall" wrote in message
...


Wrong. You don't know what I bought.

This was a particular product CC3011aed15 with screened lead. The cable
run is along with a substantial bunch of network cables and the signal is
weak. With un screened cables the error rates increase and the DSLAM
reduces the link speed. These cables are substantially better based on
measurements at the router. Ebuyer do do this product but at £3.38. I
am not going to tit about for 6p.



Lets think about it.. the signal runs over POTS cable for few km and then
through your super cable for 5m and you think it makes a difference?

You think about it before commenting, or better still, go and read
about EMC issues with DSL services.

You didn't read the details which explained that the cable run is
together with a bunch of network cables which are unscreened. While
they are twisted pair, there is a fair amount of radiated interference
close to the cables because balance is not necessarily very good

This is a very different situation to the telco cables from the
exchange where the induced interference is predominantly common mode.
The DSL modem will take care of that. In the home it's a different
story because there are many interference sources.

The RF signal levels at the upper end of the DSL range (1MHz or 2MHz)
are at very low level and subject to all kinds of interference.

I set up tests with the router close to the phone entry point and
obtained once set of figures.

I then installed it in its final location and used a cheap bell wire
type of lead of the type you suggest. Several dBs went off of the CNR
and after a while the DSLAM had reduced the operational speed by about
500k. When there is only 2.5-3Mbit to begin with, this is significant.

On replacing the modem cable with the screened one, the figures
returned to the original values.

Obviously the screened cable doesn't improve the figures compared to
when the signal enters the house. It certainly makes a difference to
whether or not there is further degradation.