Should Modem Be Connected As Close To Poss To Master Socket?

I have a data extension connected to my master socket (25m cable).

Am I better having my Fibre modem connected directly to the Master socket or does it make any difference if it was master socket + 25m cable?

As 25m could make a reasonable difference in speed on fibre I am assuming directly to master socket is best or is the only length that matters is to the master socket?

Thanks

Have you already got fibre, and if so is it a BT engineer-installed data extension cable done at the time?

The cable should be as short as possible, but it's pointless having it in the wrong place. So there's a choice that only you can make.

Proof is in the pudding.

A good twisted pair 25m cable may make little difference, unless you are on the steep slope part of VDSL2 and trying to get 50Meg+, when 25 of cable may mean 5 Meg lost.

Ideal world a nice short cable to the master socket, (under 1m long).

You can locate the Ethernet router, up to 100m away from the openreach modem, that cable length is less fussed about the distance.

In reply to a post by MrSaffron:

You can locate the Ethernet router, up to 100m away from the openreach modem, that cable length is less fussed about the distance.

Most likely a LOT more than 100m for cat5 Ethernet - but 100m is a lot of cable in most homes