It definitely is a master - with the yellow cylindrical capacitor?
Are there any extensions in the house - used or not? If there are, how many connections are there to the master faceplate? A connection is two or three wires - always T2 and T5, and often T3.
Please tell us the number on each of those and their colours.
Note! Best to check this well inside daylight hours unless you can do it without disconnecting. It's 7pm now and I would say that's a bit late. It can make a difference to the connection speed just like it could on ADSLx.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk.
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Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
Edited by RobertoS (Thu 04-Aug-16 19:08:06)