Severe crosstalk started 24 hours ago
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- Re: Severe crosstalk started 24 hours ago
Severe crosstalk started 24 hours ago
24-10-2008 12:04 AM
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This has only started happening very recently and I've tried various combinations of different routers on each line to no avail. Interleaving is enabled on my line and I've requested PlusNet enable it on the other if it isn't already. No idea if this will help but I just can't face having to try to report this via BT.
If the interleaving doesn't fix it (and I don't really see that it could, given the problem has only now manifested after 3 years of us both having adsl), does anyone have any ideas how I might go about getting this fixed?
Both modems are connected to filtered faceplates right where the line enter the buildings so there's nothing more I can do to improve the line quality from this end....
Re: Severe crosstalk started 24 hours ago
24-10-2008 10:15 AM
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Also, my line characteristics have changed since BT fixed a line fault many months ago, I have list 1Mb of speed due to this, BT tell PN this is acceptable and PN just fold in response.
You could be in the same postion I am afraid.
SW.
fixed typos oct/24
3Mb FTTC
https://portal.plus.net/my.html?action=data_transfer_speed
Re: Severe crosstalk started 24 hours ago
24-10-2008 2:04 PM
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Re: Severe crosstalk started 24 hours ago
24-10-2008 4:22 PM
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Re: Severe crosstalk started 24 hours ago
24-10-2008 4:47 PM
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To summarise - 2 adsl accounts, been installed for 3 years and co-existed happily. As of late Wednesday evening the routers began fighting each other. One syncs, the other starts syncing and kicks the first one off. Repeat ad-infinitum.
Both routers are connected to filtered faceplates where the line enters the buildings. I have tried various combinations of 5 different routers (Billion, Netgear, Thomson).
BT have recently replaced a large run of overground multicore, but this was a few weeks ago and until now had been running ok.
Line stats haven't changed - both are around 57db attenuation downstream and sync around 3400 to 3800 depending on time of day.
The router on ticket 26761599 is currently switched off. Without doing this it's impossible to get either to connect.
Re: Severe crosstalk started 24 hours ago
03-11-2008 1:21 PM
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3Mb FTTC
https://portal.plus.net/my.html?action=data_transfer_speed
Re: Severe crosstalk started 24 hours ago
04-11-2008 5:49 PM
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Quote from: godsell4 Any progress on this one ...
Yes. And No. !
PlusNet have been really helpful and booked a visit by a BT Broadband engineer to look at both lines. However when he arrived he only had a fault logged against my line and was reluctant to set foot into the neighbour's house. I explained the problem and my suspicion that it was high-frequency crosstalk on on our lines. He looked at me blank, saying something along the lines of "It sounds like you know more about how adsl works that I do".
He then proceeded to blame the problem on, amongst other things, the fact the neighbour's line is rubbing slightly against the side of my house, and the that their wiring runs close to some mains cabling. I couldn't see how these could cause two lines to suddenly start interfering with each other but I kept quiet.
With the neighbour's adsl still turned off he plugged in his test router & laptop into my line and got sync (no surprise there - I'd told him either of our routers would work in isolation), and proclaimed everything to be ok! I managed to get him to stay put while I turned the neighbour's router on - and as soon as he synced his test box it kicked the neighbour's off. However, because his fault was logged against my line and his test box worked ok, he said everything was fine and that was all he could do.
I'd given up hope that he'd be able to do anything useful so I let him go.
Back to my box of spare routers, I kept trying various combinations on both lines until I hit upon a pair that would run without fighting. Turns out a Billion 5102S on my line and a BT 2110 on the other works ok, albeit with a reduced sync on the BT router (2100bps compared to my 3360).
It's been stable for a few days so I'm leaving it at that. Unless the lines degrade further and make these 2 routers unstable I doubt I'll get any joy out of BT.
Fingers crossed !
Re: Severe crosstalk started 24 hours ago
04-11-2008 6:06 PM
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Re: Severe crosstalk started 24 hours ago
04-11-2008 6:09 PM
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Quote from: itsme It sound more like a high resistance short between the 2 pairs. With your neighbours help I would suggest dialling 17070 on phone 1 and select option 2 (quiet mode) then with someone listerning on phone 1 go to phone 2 and again dial 17070 and see if the the STD number annoucement for phone 2 can be heard on phone 1. You could also select option 2 on phone 2 and speak to see if you can be heard on phone 1.
Thanks but already tried that
I did also get the engineer to put a tone on one line and 'sniff' and listen for it on the other - nothing at all, so any crosstalk is probably only happening at much higher frequencies.
Re: Severe crosstalk started 24 hours ago
04-11-2008 9:12 PM
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Re: Severe crosstalk started 24 hours ago
04-11-2008 9:33 PM
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Re: Severe crosstalk started 24 hours ago
04-11-2008 9:44 PM
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Re: Severe crosstalk started 24 hours ago
05-11-2008 9:43 AM
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Quote from: itsme Insulation do not stop inductive or conductive crosstalk.
Physical proximity between wires is necessary for either inductive or conductive noise transference to occur. The insulation provides a physical separation at a specified distance, which when reduced can increase the probability of crosstalk. As it is more likely for the insulation to break down at one only wire the circuit is unlikely to be balanced. In addition, any phase difference between the signals on each wire in the pair will also cause noise.
Ultimately, insulation is there for a reason - to act as a dielectric material. If BT have over-meggered the wires to ensure that there is no continuity, they could cause marginal insulation to break down a bit more and generate cross talk.
Your comment for the same user details being entered in both routers came to my mind too (the fault behaviour is typical of this) but I assumed that the OP would have checked this out amidst his many trials & errors and so should have PN.
Edit: Conductive noise is totally dependent on the integrity of the insulation and unlike inductive loads it cannot be balanced out by the twists in the pair. Also, in the case of inductive noise, I assume that the pitch of the twist in the pair is tuned to the voice frequencies rather than the higher DSL frequencies and so may be less effective in cancelling out high frequency noise. Anyway, tension in the cable and bending that alters the pitch of the twist can also have a detrimental effect on balancing out noise, besides ultimately leading to chaffing and insulation breakdown. In conclusion, BT may have botched up the installation - but checking out username and passwd should be the first port of call.
HTH.
Re: Severe crosstalk started 24 hours ago
05-11-2008 1:13 PM
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Quote from: itsme As the OP is switching routers/modems around and seem to be responsible for the neighbours setup could the problem be that the OP has accidentally setup the modems/routers up with the same account?
Nope
Often wondered if that would work actually, can you log a router into PlusNet with a valid account + pw, but on a line other than the one the account is set up for ?
Re: Severe crosstalk started 24 hours ago
05-11-2008 1:15 PM
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The line will be "locked" to a particular realm (or set of realms) such as plusdsl.net. However, any valid user from that realm will be able to log in from that line.
B.
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- Re: Severe crosstalk started 24 hours ago