advice needed, dropping out when more than one line connecte

Can anyone help or explain why i have this problem

Currently i have 3 lines installed and am having problems with the lines dropping at the same time. This has been going on for ages but i have just noticed something that might give a clue to the problem.

I have just noticed if i pull the cable that connects one router to the master socket via the filter and then plug it in again it actually causes the adsl to drop on the other two lines, it can take a very long time for all three lines to connect again. It does not matter which line i disconnect/connect the same thing happens.

I really don't understand why this is happening because in theory each line should be separate and should not be affected by what is happening on another line.What happens when the router is trying to connect is there some sort of noise that could be contaminating the other lines that is causing them to drop out?

The trick will be to compare the router statistics, i.e. connection speeds, attenuation and noise margin. When you have just 1 line connected, 2 lines and then all 3 three ADSL modems running on the three different lines.

Crosstalk may be the issue, possibly made worse by other factors.

Is it just the physical plugging in, or does a power off/on on an ADSL modem cause same issue?

Thanks for the reply Andrew

ok here are the partial results

1 line active

BT
speed 3065 up 683 down
upstream noise 6 / output power 0 attenuation 34
downstream noise 9 / output power 12 attenuation 57

------------Connected 2nd line IDnet BT stayed up----------------

BT
speed 3065 up 683 down
upstream noise 5 / output power 0 attenuation 33
downstream noise 9 / output power 12 attenuation 57

IDnet
speed 5600 up 448 down
upstream noise 20 / output power 20 attenuation 31
downstream noise 6 / output power 12 attenuation 59

---------------Connected 3rd line Talk Talk- All lines dropped
After 20 mins Id Net is back up

IDnet
speed 2592 up 448 down
upstream noise 19 / output power 18 attenuation 31
downstream noise 6 / output power 12 attenuation 58

other 2 lines are still down after 45 mins, i will report back with the figures when they are back up.

Power off/on causes the same problem, i will test later if a router reboot causes the problem also

Edited by deleted (Mon 22-Apr-13 20:37:59)

The noise got worse on the BT line even though it stayed in sync, so issue may just be cross talk.

Are the drop wires very very old, and possible not using twisted pairs? This would cause a lot of issues.

For you have NTE5 master sockets for all 3 lines, i.e. to test at the test socket, and eliminate any issues there.

DELETED: OP posted wrong stats originally

Edited by XRaySpeX (Mon 22-Apr-13 21:14:25)

reslly sorry those figures were wrong, i just checked from what i have noted down, really sorry

BT
speed 3065 up 683 down
upstream noise 6 / output power 0 attenuation 34
downstream noise 9 / output power 12 attenuation 57

------------Connected 2nd line IDnet BT stayed up----------------

BT
speed 3065 up 683 down
upstream noise 5 / output power 0 attenuation 33
downstream noise 9 / output power 12 attenuation 57

IDnet
speed 5600 up 448 down
upstream noise 20 / output power 20 attenuation 31
downstream noise 6 / output power 12 attenuation 59

---------------Connected 3rd line Talk Talk- All lines dropped
After 20 mins Id Net is back up

IDnet
speed 2592 up 448 down
upstream noise 19 / output power 18 attenuation 31
downstream noise 6 / output power 12 attenuation 58

again really sorry for the wrong figures, nearly 3 hours later talk talk has not connected even when the other 2 lines are disconnected. I have eventually just switched it off and put the BT one on which took about 10 mins to connect.

The IDNet line is syncing a lot lower when both are on. This should not happen, I run two lines here. So what I said earlier about checking at master sockets, and I would add avoiding routers being too close to each other, and possibly ditching the supplied flat RJ11 lead for a short twisted pair one might help.

To give you some idea, I've had one of my ADSL lines flapping up and down due to a fault on that pair, but the other continues happily

Is it possible that the power supply for the TalkTalk hub is extremely noisy and as soon as that is connected to the line the noise levels go way up, cross talk increases and the others fail/fail to connect and because the noise gets so high the other lines will not sync immediately.

As you suggest, the OP needs to get all connection cables to a reasonable quality and then to get the modems/hubs as far apart as possible and try again.

if you unplug the BT and IDNet lines and fire up the Talk Talk line what stats do you get.

Also what ADSL standard is in use - are they all the same ? eg G.dmt / ADSL2 / ADSL2+ or G992.1 / 992.3 / 992,5 etc