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Author Topic: 'Output Power' - chicken or egg?  (Read 7390 times)

geep

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    • My ST546 Statistics
Re: 'Output Power' - chicken or egg?
« Reply #15 on: August 05, 2009, 10:17:58 PM »

Hi,
Since end June my ST546v6 reports Output Power (Up/Down) [dBm]:   12.5 / 21.5. And two exceptional days at 12.5 / 22.0.

Looking at kitz earlier comments "if your line has >19dBm output power then its reaching its limits" my line must be near the limit.

Other stats currently: Line Attenuation (Up/Down) [dB]:   20.5 / 37.5
SN Margin (Up/Down) [dB]:   9.5 / 11.0
Bandwidth (Up/Down) [kbps/kbps]:   735 / 6,676

Cheers,
Peter
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b4dger

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Re: 'Output Power' - chicken or egg?
« Reply #16 on: August 06, 2009, 09:05:53 AM »

...increasing the "gain"...
I remember back in dial-up days everyone was asking BT to turn up the 'gain' to squeeze the last drop out of things!
But I thought this was irrelevant for ADSL.  But the other day I did see a post elsewhere by a "BT engineer" advising someone to ask for the gain to be increased to help their ADSL problem.

Anyone know the true about this?
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roseway

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Re: 'Output Power' - chicken or egg?
« Reply #17 on: August 06, 2009, 09:12:55 AM »

'Gain' in the dial-up modem sense was simply a matter of increasing the audio volume, which wouldn't benefit ADSL in any way. If anything, it might slightly degrade the ADSL by adding interference. Maybe the BT engineer was talking about ADSL output power, or maybe he was talking nonsense.
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  Eric

orainsear

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Re: 'Output Power' - chicken or egg?
« Reply #18 on: August 06, 2009, 09:42:08 AM »

Gain could be a reference to 'coding gain' in the error correction code (which probably be adjustable at the DSLAM?); it's basically how much you can lower the SNR margin while maintaining a particular error rate.
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