Attenuation?

Cookiemonster · Mar 25, 2008, 11:03:20

Me again!!

I was doing a little fiddling about with my 2700 router last night and noticed something strange. My current Attenuation is a nice 23.3dB with a 6dB SNR, however when i plug it directly into the test socket it jumps up to 26dB, nothing else changes i mean my sync still remains at 8128kbps. Is this normal? it seems by plugging into the test socket my line distance increases.....

Unplug it and replace the cover of the master socket and the Attenuation returns to 23.3dB.

Any info greatly appreciated.

Cheers Jester

Rik · Mar 25, 2008, 11:07:30

Hi Jester

That's weird. The only things I can think of is that the additional wiring changes the impedance of the line and thus affects the attenuation (this my be gibberish on my part, of course), or that the connection you are making inside the test socket is poorer than in the faceplate for some reason.

Strange, either way, so if you're concerned, give support a ring - they may have some sensible answers.

Cookiemonster · Mar 25, 2008, 11:11:57

Cheers Rik.
I'm not really that concerned enough that it warrants a call to support just one of these this that baffled me. I've not noticed anything wrong with my connection or line so i guess if it's not broke then don't fix it. All i wondered was if any of the more technical minded regulars ( or should i say Hoobs!!!) could shed any light on it.

Rik · Mar 25, 2008, 11:14:19

If I find anything out, I'll post back...

Lance · Mar 25, 2008, 11:16:13

Quote from: jester212 on Mar 25, 2008, 11:11:57
All i wondered was if any of the more technical minded regulars ( or should i say Hoobs!!!)

I prefer the term regulars myself!

Cookiemonster · Mar 25, 2008, 11:16:45

Here here!!

Rik · Mar 25, 2008, 11:23:05

I had a word with Andrew, Jester. He's come across this once before, it's not logical, but the conclusion was that somehow the extension wiring improved the filtering rather than worsening it.

Cookiemonster · Mar 25, 2008, 11:25:10

Quote from: Rik on Mar 25, 2008, 11:23:05
I had a word with Andrew, Jester. He's come across this once before, it's not logical, but the conclusion was that somehow the extension wiring improved the filtering rather than worsening it.

Cheers Rik. I guess it's just another one of the many mystery's that surround ADSL!!

Rik · Mar 25, 2008, 11:25:45

It's all down to smoke, mirrors and incantations.

Cookiemonster · Mar 25, 2008, 11:28:12

Sounds more like black, voodoo or what ever kind of magic you want to call it to me!!

Rik · Mar 25, 2008, 11:34:07

That too.

Lance · Mar 25, 2008, 12:13:57

I've got a Black Magic easter egg to eat this afternoon!

Rik · Mar 25, 2008, 12:22:20

Can I come round?

Lance · Mar 25, 2008, 12:46:08

Certainly can Rik, but I fear it may have disappeared before you get here!

Rik · Mar 25, 2008, 12:46:43

Not fair.

Cookiemonster · Mar 25, 2008, 12:48:08

Seen as its my topic i think i should get first refusal!!!

Lance · Mar 25, 2008, 12:48:48

Rik · Mar 25, 2008, 12:54:05

Quote from: jester212 on Mar 25, 2008, 12:48:08
Seen as its my topic i think i should get first refusal!!!

I thought we were on about Black Magic??

Cookiemonster · Mar 25, 2008, 13:53:13

Quote from: Rik on Mar 25, 2008, 12:54:05
I thought we were on about Black Magic??

Well yeah the chocolate kind now!!

Sebby · Mar 25, 2008, 14:34:23

ADSL is a strange beast. As it doesn't change sync, I wouldn't worry about it, though at least we know the probable reason now.

g7pkf · Mar 25, 2008, 19:35:27

Riks first assumption was the best.

lines have 3 factors.

resistance
inductance
capacitance.

something in your "extra" wiring is changing one of the above for the better as far as the adsl is concerned.

probarly one of the latter 2.

lookin at this again i suspect that its because you are so close to the exchange that extra wiring "helps".

and with stats like that (you lucky bugg*r) why worry.

Dean G7PKF

Rik · Mar 25, 2008, 19:37:40

Thanks, Dean, it's good to have the words of the master.

Cookiemonster · Mar 25, 2008, 20:51:57

Quote from: g7pkf on Mar 25, 2008, 19:35:27
Riks first assumption was the best.

lines have 3 factors.

resistance
inductance
capacitance.

something in your "extra" wiring is changing one of the above for the better as far as the adsl is concerned.

probably one of the latter 2.

looking at this again i suspect that its because you are so close to the exchange that extra wiring "helps".

and with stats like that (you lucky bugg*r) why worry.

Dean G7PKF

Thanks for the info. Though i wasn't worried really just curious and wanted some insight into it...always good to learn as much as you can about ADSL i say.

Sebby · Mar 25, 2008, 21:34:19

Thanks for the technical explanation, Dean. It's always useful to know the real reason behind things.

Lance · Mar 25, 2008, 22:30:56

I'm finding that the learning about adsl is a constant process!

Sebby · Mar 25, 2008, 22:59:51

It certainly is, Lance, and a frustrating one.

Rik · Mar 26, 2008, 08:10:31

The same is true of life, Lance.