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Author Topic: Not too bad  (Read 8964 times)

UncleUB

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Not too bad
« on: January 17, 2012, 10:23:39 AM »

For a long line




Quote
DSL Type:   G.992.5 annex A

Maximum Bandwidth (Up/Down) [kbps/kbps]:   863 / 4,620

Bandwidth (Up/Down) [kbps/kbps]:   871 / 3,580

Output Power (Up/Down) [dBm]:   12.5 / 17.5

Line Attenuation (Up/Down) [dB]:   41.0 / 65.5

SN Margin (Up/Down) [dB]:   6.0 / 7.5
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roseway

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Re: Not too bad
« Reply #1 on: January 17, 2012, 10:29:45 AM »

Amazingly good ;D
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  Eric

burakkucat

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Re: Not too bad
« Reply #2 on: January 18, 2012, 01:15:24 AM »

For a long line

A long line, which is how long, Uncle:-\  (I like to consider all the information, together.)
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roseway

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Re: Not too bad
« Reply #3 on: January 18, 2012, 07:15:51 AM »

It's this long:

Quote
Line Attenuation (Up/Down) [dB]:   41.0 / 65.5

:)
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  Eric

UncleUB

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Re: Not too bad
« Reply #4 on: January 18, 2012, 08:41:20 AM »

This is the actually(approx) distance quoted from my house to the exchange

Quote
Exchange: Attercliffe   BT Code: SLAC
Location: Titterton Street,   S9 3TE
Distance:-   Direct:         1.85 km
    (appx)*   By Road:    3.7 km
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Oranged

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Re: Not too bad
« Reply #5 on: January 18, 2012, 09:06:54 AM »

This is the actually(approx) distance quoted from my house to the exchange

Quote
Exchange: Attercliffe   BT Code: SLAC
Location: Titterton Street,   S9 3TE
Distance:-   Direct:         1.85 km
    (appx)*   By Road:    3.7 km

That's strange, my attenuation is 38dB and this is my exchange distance result :
Quote
Distance:-    Direct:          2.05 km
     (appx)*    By Road:    3.38 km

I would have expected your road distance to have been significantly longer than mine.
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camallison

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Re: Not too bad
« Reply #6 on: January 18, 2012, 11:39:10 AM »

Ah yes, but Unky's are Yorkshire miles, and they are a heck of a lot longer than your British Standard mile  ;)

Colin
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burakkucat

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Re: Not too bad
« Reply #7 on: January 19, 2012, 03:09:40 AM »

It's this long:

Quote
Line Attenuation (Up/Down) [dB]:   41.0 / 65.5

:)

b*cat gives Eric a quick hiss.  >:(  The attenuation can only be related to the physical line length when standard gauge copper is used, with no narrow gauge aluminium, an average number of joints, no "blue beans", gel crimps only, etc, etc, as you know. If a line is in incredibly poor condition, the physical length could be 0.5 mile but still have that 65.5 dB downstream attenuation!  :P

And, as we also know, a modem that reports 65.5 dB is probably saying "I'm unable to quote a proper value for the attenuation".  :-X

b*cat lowers the fur on his back and comes out of grumpy-mode. There now follows the data for my line. So where does it fit into the scale of very short, short, medium, long and very long, please?



Code: [Select]
DSL                         Down         Up

Current Rate:                 5305 kbs 1008 kbs
Max Rate:                 5305 kbs 1024 kbs

Current Connection:
Current Noise Margin: 3.2 dB 6.8 dB
Current Attenuation: 45.7 dB 27.3 dB
Current Output Power: 19.4 dB 12.4 dB

Having measured my D-side cable length (with a 301C tester) I know that there is exactly one quarter of a mile of cable (440 yards / 400 metres) between my home and the PCP.

Code: [Select]
Exchange: Bury St Edmunds BT Code: EABSE
Location: Whiting St, IP33 1NS
Distance:- Direct:    1.8 km
  (appx)* By Road:   2.4 km
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Oranged

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Re: Not too bad
« Reply #8 on: January 19, 2012, 09:58:32 AM »

So the conclusion that I draw when comparing those 3 sets of data is that there is no reliable relationship between attenuation and road distance to the exchange.
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roseway

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Re: Not too bad
« Reply #9 on: January 19, 2012, 10:14:28 AM »

Quote
And, as we also know, a modem that reports 65.5 dB is probably saying "I'm unable to quote a proper value for the attenuation".

I'm not sure that's quite right. Many modems won't report anything over 63.5 dB, because this is the highest value specified in the G.992.1 standard. See http://www.kitz.co.uk/adsl/linestats.htm#attenuation_63dB . But if a modem is reporting more than 63.5 dB, that implies that it's not using the 63.5 dB 'cut-off' and is reporting a correct value.
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  Eric

CurlyWhirly

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Re: Not too bad
« Reply #10 on: January 19, 2012, 03:55:34 PM »

For a long line




Quote
DSL Type:   G.992.5 annex A

Maximum Bandwidth (Up/Down) [kbps/kbps]:   863 / 4,620

Bandwidth (Up/Down) [kbps/kbps]:   871 / 3,580

Output Power (Up/Down) [dBm]:   12.5 / 17.5

Line Attenuation (Up/Down) [dB]:   41.0 / 65.5

SN Margin (Up/Down) [dB]:   6.0 / 7.5
That's excellent as the attenuation on my line is 'only' 55 dB and I only get around the same bandwidth as you !

Mind you, I live on a main road and with a nearby street light and at night when the street light comes on, this affects the broadband signal as my line is only around a foot away from the street light at one point.
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Mike

burakkucat

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Re: Not too bad
« Reply #11 on: January 19, 2012, 09:25:53 PM »

Quote
And, as we also know, a modem that reports 65.5 dB is probably saying "I'm unable to quote a proper value for the attenuation".

I'm not sure that's quite right. Many modems won't report anything over 63.5 dB, because this is the highest value specified in the G.992.1 standard. See http://www.kitz.co.uk/adsl/linestats.htm#attenuation_63dB . But if a modem is reporting more than 63.5 dB, that implies that it's not using the 63.5 dB 'cut-off' and is reporting a correct value.

Ah, that you for that correction, Eric. b*cat bows, in apology.  ;)
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burakkucat

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Re: Not too bad
« Reply #12 on: January 19, 2012, 09:29:11 PM »

So the conclusion that I draw when comparing those 3 sets of data is that there is no reliable relationship between attenuation and road distance to the exchange.

Correct. Other than a very broad "rule of thumb", to be taken with a big "pinch of salt".  :-X
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waltergmw

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Re: Not too bad
« Reply #13 on: January 20, 2012, 12:48:54 AM »

@ Eric,

Quote
Many modems won't report anything over 63.5 dB, because this is the highest value specified in the G.992.1 standard.

I expect you know that the 2700 has the best of both worlds with the restricted value in the normal user area but TWO actual values on the diagnostic page.

Kind regards,
Walter
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roseway

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Re: Not too bad
« Reply #14 on: January 20, 2012, 08:12:28 AM »

@Walter,

Yes, and it also reports the specific value at 300 kHz, which might possibly be useful in some cases.
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  Eric
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