Routerstats SNR wave

Sebby · May 16, 2008, 17:58:47

Quote from: gingerjedi on May 16, 2008, 16:07:51
I've just ordered one of these, I don't know if it will make much difference but it's worth a try over the standard flat ribbon cable I'm using now, saying that... I do wonder why I bother shielding the last 7 feet when BT doesn't give a toss about the other 7,000. $:-\$

I've just seen the same one on the PC World site: linky £18.94 delivered compared to Play's £2.99! I don't think I've ever seen such a massive disparity in prices.

The only thing I'd say is that 2.1m is quite long, and if you don't need that length, I'd strongly consider getting one of ADSL Nation's instead (0.5m or 1m). As well as it being shielded, length is one of the most important factors.

Rik · May 16, 2008, 17:59:59

Quote from: Sebby on May 16, 2008, 17:58:47
length is one of the most important factors.

Or so I've been told.

Sebby · May 16, 2008, 18:01:30

As I finished writing it, I thought someone would pick up on that, but I was too lazy to change it.

Rik · May 16, 2008, 18:07:43

You didn't have to wait long, did you.

Sebby · May 16, 2008, 18:16:56

I wouldn't want it any other way.

gingerjedi · May 23, 2008, 14:53:40

After nearly a week of getting graph 1 I'm back to graph 2 again.

I'm on ADSL home 2000 but my attenuation is a steady 47db which I know is out of scope, rather than have my profile dropped to 1meg is there a halfway house of say 1.5meg? Is this likely to improve things?

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Rik · May 23, 2008, 14:58:09

Ouch, that is a lot of noise there!

There is no 1.5Mbps service, it's 512, 1M or 2M with fixed rate. You're in a difficult position, because BT's reaction is likely to be to move you to 1Mbps if a fault is raised. Do you plot attenuation as well, does that show any movement in line with the noise?

gingerjedi · May 23, 2008, 15:14:40

Attenuation never changes, I've had the SNR line almost completly flat (I didn't save a pic) so I have no idea what's caused this?

If I do go to 1meg would this guarantee less noise? I suppose if the problem is still there at least I can get BT to sort it out as I will be within spec, then I can get the nice people at IDNET to put it back up again.

Rik · May 23, 2008, 15:16:29

The noise won't be reduced by going to 1M, but the line should be more stable. OTOH, if it's not, BT could decide the line is incapable of supporting ADSL - it's really a case of finding out what is causing the noise. The reason I asked about attenuation was that it was a long shot that the noise spikes were linked to high attenuation, which would indicate a line fault.

Steve · May 23, 2008, 15:24:56

For my own interest. Why is there such a difference in margin?The first graph shows a constant high margin which correct me if I am wrong is typical of a fixed rate service, it them seems to drop to six with noise which would be typical would it not be of a max dsl line

gingerjedi · May 23, 2008, 15:26:40

It's definitely something outside of my house between me and the exchange is it worth reporting cross talk to get the pair swapped as suggested in another thread? This has been happening off and on for over a year now.

As for the difference in margin.

Rik · May 23, 2008, 15:30:05

Quote from: stevethegas on May 23, 2008, 15:24:56
For my own interest. Why is there such a difference in margin?The first graph shows a constant high margin which correct me if I am wrong is typical of a fixed rate service, it them seems to drop to six with noise which would be typical would it not be of a max dsl line

Agreed, Steve, there does seem to be some Jekyll and Hyde behaviour going on.

Rik · May 23, 2008, 15:31:40

Quote from: gingerjedi on May 23, 2008, 15:26:40
It's definitely something outside of my house between me and the exchange is it worth reporting cross talk to get the pair swapped as suggested in another thread? This has been happening off and on for over a year now.

It won't do any harm to try. You might want to check with Lance on what he said, but the usual approach to take is that you can occasionally hear other people's conversations on the line, albeit faintly.

Lance · May 23, 2008, 15:45:27

Quote from: Rik on May 23, 2008, 15:31:40
It won't do any harm to try. You might want to check with Lance on what he said, but the usual approach to take is that you can occasionally hear other people's conversations on the line, albeit faintly.

Those were almost my exact words, Rik

I made the point that it was intermittent

Rik · May 23, 2008, 15:48:13

Yes, always give them an intermittent to chew on - it leaves them feeling a pair swap will be easier.

Sebby · May 23, 2008, 17:25:58

Good luck. It'll be interesting to hear whether this cures it. BT's cabling really does need a complete overhaul.

gingerjedi · May 27, 2008, 12:17:40

Its been like this ever since I last posted, the urgency goes away when I calm down and I don't want to risk losing ADSL alltogether!

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Rik · May 27, 2008, 12:25:36

It's frustrating - that's what the graph should look like, that's what it can look like, so what is causing the problem. You need a BT engineer to move in with you until it starts up, and then leap into action.

Sebby · May 27, 2008, 19:19:41

Now there's an idea, Rik...

Rik · May 27, 2008, 19:26:37

If only...

Sebby · May 27, 2008, 19:27:19

I reckon they'd still make excuses, though.

Rik · May 27, 2008, 19:28:09

Of course they would, but they'd be an altogether better class of excuse.

Sebby · May 27, 2008, 19:29:28

It would be like "didn't you just close a door? That's a well known cause of re-syncs."

Rik · May 27, 2008, 19:30:01

Sebby · May 27, 2008, 19:31:56

Thanks, Rik.

It's nice when the likely truth of the matter is funny.