On Sat, 30 May 2020 06:46:38 +1000, Jake56 wrote:
Tricky Dicky wrote
Do not connect your router/modem to an extension socket on the phone
network it should be connected directly to the BT/Openreach master
socket with the shortest modem lead you can manage.

Thats bull****. There is FAR more copper lead between the master socket
and the exchange or node than there is to any extension socket.

There's some truth, but it's oversimplified. The phone line is a twisted
pair, which resists interference. The master socket splits out a bell
wire (which isn't needed by most modern phones, but older ones need it).
This means that the line is no longer balanced, you have three wires not
two. If you use a plug-in extension, or follow the standard BT extension
plan, you'll extend this unbalanced line which can pick up interference.
Also a lot of "extension" cable you can buy in the DIY shops is poor
quality - and extension cables are often flat with no twist.

The correct way to do things is fit a filter at the master socket -
something like this https://www.ebay.co.uk/itm/231901235940 if you've got
a square NTE5A or this https://www.ebay.co.uk/itm/323768321976 for the
new NTE5C. Take a dedicated extension to the router, using only one pair
and proper CW1308 copper (not CCA) cable. Take all the phones from the
filtered terminals using a separate cable. The router lead does want to
be as short as possible, as these usually aren't twisted, though if you
can find a twisted-pair RJ11 lead the length shouldn't matter.

Done like this you should see no drop in speed. Theoretically there's
some, due to the extra length and impedance discontinuity at the master
socket, but it's tiny compared with the line itself. On the other hand,
use a 20m tinsel-wire flat cable to extend your line, and you may well
see a substantial drop in speed.

Mike