Thank you very much for the quick reply
It's greatly appreciated.
This is the problem I referred to back in " Six master sockets on one line
Downstream is now showing attainable of 36.2Mbps down and 5.3Mbps up. The Openreach DSL tester shows an impacted line should
be capable of between 62Mbps and 39.8mbps down and 19.5Mbps and 10.7Mbps up.
POTS tests fine and a quiet line test shows nothing.
The office next door, which is connected to the same DP and DSLAM, has a current sync of 80000/20000.
I'm trying to persuade someone to send an Openreach engineer and a JDSU out to show there really is a problem. This is after having tried with four different VDSL2 modems (al different brands) and replacing all the wiring from DP to master socket (which was copper coated steel).
The DP is on the front of the building between the two offices at first floor level and the multipair feeding it comes over the roof. I'm wondering if someone got a bit distracted while wiring things up a ladder many years ago and there's been a split pair ever since.
We need to start doing offsite backups and the connection speed isn't close to good enough. Next door's works fine for offsite backups.