In reply to a post by MrSaffron:

When you lose connection has the modem actually resynced?

SSH should cope with the odd blip in latency, i.e. tcp/ip is generally only affected when CRC/ES climb to high levels and at those levels the DLM would react and slow you down.

Given the margin between max and actual sync I don't think your issues are noise on VDSL induced.

No, as far as I can tell I am not loosing sync at all. The connection itself seems very stable other than the spikes in upstream CRC/ES.

UPDATE.....

Over the weekend I was able to move my master socket (yes I know you are not supposed to). To the roof space and connect up the data and phone line separately via the cw1308 cable using one pair for the data (AB) and one pair for the phone (2/5) down to an Rj11 and BT socket under the stairs. This was a disaster, sync dropped to 44 Mb down and 10Mb up.

So we can cross no. 2 of the list as a solution.

Can anyone tell me what (if any) difference there is between connecting direct to the A and B of the BT drop cable and the A and B terminals of the master socket (I have a MK4 with the vdsl face plate). I know the 5/2 terminals are for phone extension and as such are filtered so extensions do not need micro filters.

Over the weekend I was able to move my master socket (yes I know you are not supposed to). To the roof space and connect up the data and phone line separately via the cw1308 cable using one pair for the data (AB) and one pair for the phone (2/5) down to an Rj11 and BT socket under the stairs. This was a disaster, sync dropped to 44 Mb down and 10Mb up.

So both signals are separated , but still travelling through separate pairs in the same cable ..... What was the point of that ??

Plus the twists on the pair aren't especially high. If the length of the pair carrying the DSL signal after the filter is long enough this in itself can cause issues, especially if the phone line itself is being used for speech at the same time.

Can anyone tell me what (if any) difference there is between connecting direct to the A and B of the BT drop cable and the A and B terminals of the master socket

Eh ??

In reply to a post by ear9mrn:

Can anyone tell me what (if any) difference there is between connecting direct to the A and B of the BT drop cable and the A and B terminals of the master socket (I have a MK4 with the vdsl face plate). I know the 5/2 terminals are for phone extension and as such are filtered so extensions do not need micro filters.

A data extension should be taken from the A&B "red" terminals on the Mk4 filtered faceplate rather than from the A&B terminals on the back of the master NTE5C socket. A filtered voice extension is taken from the front "blue" or "clear" terminals on the NTE5C (if using a Mk4 filtered faceplate.)

In your case its probably better to use CAT5e cable for the data extension and separately CW1308 for the filtered voice extension since you already have a suitable length of CW1308.

In reply to a post by ear9mrn:

My only issue is that when I am working away from home and need to connected back to my linux box via ssh I loose connection at least for or five times during the day and have to reconnect, the IP has not changed and the modem and router have not rebooted or anything.

This isn't really fixing the underlying issue, if there is one, but can I suggest you look into trying the Mosh Shell: https://mosh.org

It's designed for situations where they is high latency and intermittent connections. Might be worth a look to see if it solves your problem.

further update...

looked up my details on here http://www.dslchecker.bt.com/

and discovered the following for my line/cabinet

VDSL Range A (clean)
down rate(Mbps) high = 80, low = 62.6
up rate (Mbps) high = 20, low = 19

VDSL Range B (Impacted)
down rate(Mbps) high = 74.1, low = 44
up rate (Mbps) high = 20, low = 14.2

Looking at my modem (xdslcmd info --stats) tells me I am on Annex B (impacted) so clearly there is "some issue" with my line and the sync rates confirm this and tally with the table above, its odd how I have close to the max on the down by way off max in the up!

I am starting to think it may be worth hooking my modem up to the master socket right next to the BT drop cable and rule out this extension once and for all. If I get the same sync rates with that scenario and same CRC and ES spikes I know its outside my control and I just have either moan a lot at my ISP/open reach or live with it.

In reply to a post by ear9mrn:

Looking at my modem (xdslcmd info --stats) tells me I am on Annex B (impacted)

It doesn't tell you that. Annex B means your modem is set to Europe.

In reply to a post by ear9mrn:

further update...

looked up my details on here http://www.dslchecker.bt.com/

and discovered the following for my line/cabinet

VDSL Range A (clean)
down rate(Mbps) high = 80, low = 62.6
up rate (Mbps) high = 20, low = 19

VDSL Range B (Impacted)
down rate(Mbps) high = 74.1, low = 44
up rate (Mbps) high = 20, low = 14.2

Looking at my modem (xdslcmd info --stats) tells me I am on Annex B (impacted) so clearly there is "some issue" with my line and the sync rates confirm this and tally with the table above, its odd how I have close to the max on the down by way off max in the up!

I am starting to think it may be worth hooking my modem up to the master socket right next to the BT drop cable and rule out this extension once and for all. If I get the same sync rates with that scenario and same CRC and ES spikes I know its outside my control and I just have either moan a lot at my ISP/open reach or live with it.

Annex B has nothing to do with whats on the DSL checker. You are better off learning before jumping to wrong conclusions.

So you�ve an internal bridge tap affecting your service then.

Well, if a "bridge tap" is as I have described in my original post as an extension from the BT drop cable then yes, I have a bridge tap.