I recently stumbled across some of the worst PSTN/Broadband customer premises wiring I have ever seen. TWO lines, both with ADSL, and proper ADSL faceplates on the Master Sockets., All sounds good so far. TWO other rooms, each with extensions in for both lines, but this is where it heads south.
1. The extensions are TWO wire connected not the usual THREE
2. The extensions are connected to the telco side of the master socket, not the customer side of the master socket, so are not filtered for ADSL/PSTN use properly
The net result was, the phones do not ring, the lines is noisey (as ADSL is not filtered properly) and the modem/router only connects at 7.6Mb/s despite being only 5 meters (yes 5 Meters, that is NOT a typo) from the exchange equipment…
Yes you guessed it this is INSIDE a village telephone exchange………….
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Leaving off the 3rd wire is often misguidedly given out as advice to reduce induced noise, so that’s where that came from. Sounds like someone had a little bit of knowledge, but not much.