One of your extensions will be an old style master. See these pictures
If you open them up you can tell which.
The most likely are the LJ 2/1A which is the master, see the small cylindrical capacitor at the top, and two of LJ 2/3A next to it without the capacitor.
If not those two, look through that gallery for what you have. The master is always the one with the capacitor.
As has been said, you would need an engineer install, not a self-install. On an engineer install the master will be replaced with a modern one with a filtered faceplate fitted. The modem or modem/router has to be connected to that socket.
If you find the master isn't the one you are already using and you want to continue using that one, (I advise you to check before doing anything else), you need either to arrange with the chosen ISP for a Data Extension Kit/Home Wiring Solution to be fitted, or to sweet-talk the engineer to install the new master where you want it and put the extension socket where the current master is. That's assuming you want one there.
If the nearest cab is the one you are fed from then you shouldn't lose any FTTC speed from this. To check that, put your address into the address option of this checker
, (don't use the pure postcode one!), check the line above the table for the cabinet number. Then go and check the number on your phone cabinet. Not the FTTC cabinet.
The line from the pole will only be replaced if it is damaged, and even then it may be a separate later job.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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Edited by RobertoS (Thu 31-Dec-15 19:14:14)