sounds like the engineer has swapped your E side (cab to exch) not all E side cables have the same characteristics for broadband .... this explains the speed loss.
If with BT Broadband, ask them to raise a Boost task, if a different ISP, ask them to raise an SFI task with Openreach .... when the engineer arrives, tell them what’s happened and ask them to check on ‘SEAM’ the line loss calculator, then see if you can be put on a spare/stopped pair in a ‘better range’.
Thanks, very useful tips to go back to the ISP with. More information:
The Openreach guy said he tried several pairs back to the exchange from the cabinet. I don't think that's the problem. I suspect the fault lies with the replaced cable pair between the cabinet and the pole since that is the only link in the chain that has changed. Whether it be poor grade cable or an iffy crimp and yet, he was quick to discount that without physically checking.
I'm not sure what equipment he used but it was three items of diagnostic kit he attached to the line. I should have asked but didn't really want to over-supervise him but give him space to think it through. He did do a double take on the download speed but appeared baffled as to why it should be low.
A few more days monitoring before I make a nuisance of myself with the ISP once more...
PS If the issue is between the cabinet and the pole, it's going to affect Fibre delivery
Edited by zeitgeist (Sat 03-Mar-18 15:56:52)