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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Noise, attenuation and CRC figures?



 
 
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  #1  
Old May 12th 05, 07:56 PM posted to uk.telecom.broadband
pete devlin
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Posts: 303
Default Noise, attenuation and CRC figures?

In message , Nigel M
writes
For info, I've now upgraded to 2Mbit, not much change


People make me laugh when they say this. You _do_ realise that a change
of 3dB means a doubling or halving depending on which way of course?
--
Pete Devlin
[{//////news03//////at\\\\\secondrow/////co\\\\\uk}]
"And the devil in a black dress watches over"
  #2  
Old May 12th 05, 11:19 PM posted to uk.telecom.broadband
pete devlin
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Posts: 303
Default Noise, attenuation and CRC figures?

In message , Nigel M
writes
Depends if you are talking about power or voltage, but yes. My point
was that the change didn't put the values anywhere near the limit, so
others may be encouraged to go ahead.


Since when has voltage been measured in dBs?
--
Pete Devlin
[{//////news03//////at\\\\\secondrow/////co\\\\\uk}]
"And the devil in a black dress watches over"
  #3  
Old May 13th 05, 09:56 AM posted to uk.telecom.broadband
Phil Thompson
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Posts: 2,720
Default Noise, attenuation and CRC figures?

On Thu, 12 May 2005 22:19:19 +0100, pete devlin
wrote:

Since when has voltage been measured in dBs?


or power, for that matter.

http://en.wikipedia.org/wiki/Decibel

10log10(ratio) is used for power and 20log10(ratio) for voltage, which
I guess was his point.

Phil
--
Tiscali - dialup speeds at Broadband prices.
AOL - the unlimited ISP of choice for heavy downloaders.
  #4  
Old May 13th 05, 04:55 PM posted to uk.telecom.broadband
pete devlin
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Posts: 303
Default Noise, attenuation and CRC figures?

In message , Phil Thompson
writes
On Thu, 12 May 2005 22:19:19 +0100, pete devlin
wrote:

Since when has voltage been measured in dBs?


or power, for that matter.

http://en.wikipedia.org/wiki/Decibel

10log10(ratio) is used for power and 20log10(ratio) for voltage, which
I guess was his point.


"It can also be combined with a suffix to create an absolute unit of
electrical power."
--
Pete Devlin
[{//////news03//////at\\\\\secondrow/////co\\\\\uk}]
"And the devil in a black dress watches over"
  #5  
Old May 14th 05, 12:25 AM posted to uk.telecom.broadband
Phil Thompson
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Posts: 2,720
Default Noise, attenuation and CRC figures?

On Fri, 13 May 2005 15:55:38 +0100, pete devlin
wrote:

"It can also be combined with a suffix to create an absolute unit of
electrical power."


dBs are often combined with a reference value to make them absolute,
but people have a habit of dropping the suffix. 0 dBm is 1 mW as the m
means "power relative to 1 mW" and the ratio is 1. Similar things are
used for sound levels and no reason why they couldn't be (or aren't ?)
for voltage or anything else.

Phil
--
Tiscali - dialup speeds at Broadband prices.
AOL - the unlimited ISP of choice for heavy downloaders.
 




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