OK, I haven't just restarted the router It seems that all I can do is restart PPPoE which is about as much use as.....

Ha! Found it. Restart is in the ever-so-logical place of being under "Backup"

So previously the pair AND the port have been swapped out ? So then unless it went from duff port to duff port, that really should have fixed it ?

Were tests made at the DP last time ? Could it be that the other pair in the building is dominant and messing with this one over the underground length ?

I wish I could come and have a play, I do enjoy a challenge that others have failed at, it buffs my smugometer

Quality.

Same make and model of router on both circuits ?

I had exactly that problem on my line causing poor sync speeds.

After my line was fixed following a single leg disconnect the following day the Openreach engineer knocked on my door and asked if my line was OK because it was still showing a fault. It turned out to be a split pair so he put me on a new pair and the sync has gone from 11/3 to 40/10 with some room to spare.

This was a new build I moved into over a year ago and the low sync speed had been put down to the line length.

This was with a Draytek 2850 on both (not Openreach MCT approved). This is rock steady next door and is currently syncing at 80000/20000

On the bad connection I've so far tried with the following devices' VDSL2 modems;

Openreach modem - Huawei HG612 3b
Draytek 2850
Netgear D7000 (yuk!)
Fritz!Box 3490

It looks like I'll be there on Friday afternoon for the ISP to run some tests and I'll be taking a Cisco 887VA with me.

In reply to a post by Zarjaz:

So previously the pair AND the port have been swapped out ? So then unless it went from duff port to duff port, that really should have fixed it ?

Yes, but bear in mind there's never only one split pair

In reply to a post by Zarjaz:

Were tests made at the DP last time ? Could it be that the other pair in the building is dominant and messing with this one over the underground length ?

The DP's external at first floor level between the two offices and the multipair feeding it runs over the roof. No tests were done at the DP.

In reply to a post by Zarjaz:

I wish I could come and have a play, I do enjoy a challenge that others have failed at, it buffs my smugometer

I wish you could come and play too. I like a good challenge as well

Back in about 1997 I had a dual ISDN2e into my office in central London for internet access. It was a new installation and nothing I or the ISP did could get it working with internet. BT kept coming out and kept telling us it tested fine.

Several months down the line, and having swapped out the Cisco routers at both ends several times, I persuaded BT to send someone to do an end-to-end test as that seemed to me to be the logical thing to do. We got their top ISDN engineer from the Mayfair exchange. He really didn't believe there could be a BT fault and said "All thiis is going to do is prove it's your kit that's faulty" - which I thought a bit unlikely.

His next words were; "My gawd, this line's so bad I can't even get voice down it"

It turned out there was a major fault somewhere at the bottom of Telecom Tower and it was affecting lots of customers and BT hadn't been aware of it.

We got so much compensation that it paid for a 2Mbps leased line - which wasn't cheap back in 1997.

I'm glad you got it sorted. You were lucky that the engineer was on the ball.

�97, the year I started ... I still detest working on ISDN to this very day.

You are right about it could have been swapped onto the splits neighbour, and maybe this is why it doesn�t have so huge an effect, no digital service down the other pair.