ADSL Sync Rate

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Snowflake

#89704 7-Sep-2011 20:27

Should i be getting a higher sync rate on ADSL2+?

DownstreamUpstream Hlin Scale18690Loop Attenuation(dB)34.221.1Signal Attenuation(dB)34.220.4SNR Margin(dB)12.413.8Attainable Rate(Kbps)9760945Output Power(dBm)2112.1
DownstreamUpstreamSNR Margin (dB)12.114.9Attenuation (dB)3421Output Power (dBm)2012Attainable Rate (Kbps)9760945Rate (Kbps)8377945K (number of bytes in DMT frame)15714R (number of check bytes in RS code word)1216S (RS code word size in DMT frame)0.597.5D (interleaver depth)968Delay (msec)14.3715FEC1395997CRC180Total ES111Total SES00Total UAS08491

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Regs

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Snowflake

#518271 7-Sep-2011 20:30

ugh, the html tables became a real mess

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#518291 7-Sep-2011 21:32

For 34db attenuation, I think your sync rate is very good.

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Regs

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Snowflake

#518332 7-Sep-2011 23:41

i had a google and found a couple of links that seemed to suggest i should be up towards 13Mbps on ADSL2+:

http://whirlpool.net.au/wiki/dslam_speeds
http://fremnet.net/article/216/adsl-theoretical-speed-calculator
http://en.wikipedia.org/wiki/G.DMT#DMT_history_and_line_rates

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eXDee

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#518338 8-Sep-2011 00:10

I would have expected 5000-9000kbps sync with those stats.

coffeebaron

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#518350 8-Sep-2011 06:31

Regs: i had a google and found a couple of links that seemed to suggest i should be up towards 13Mbps on ADSL2+:

http://whirlpool.net.au/wiki/dslam_speeds
http://fremnet.net/article/216/adsl-theoretical-speed-calculator
http://en.wikipedia.org/wiki/G.DMT#DMT_history_and_line_rates

That's most likely with a target noise margin of 6db, but Chorus use 12. How far are you from exchange / cabinet?

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#518352 8-Sep-2011 07:19

I would say its on the money for 12dB noise margin.

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Snowflake

#518498 8-Sep-2011 12:24

OK, thanks guys.

My next question.... attainable rate versus actual rate. 8377 vs 9760. am i on a adsl1 speed profile of some sort?

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#518688 8-Sep-2011 17:02

Regs: ugh, the html tables became a real mess

with some ADSL modem you could use DMT tool to lower SNR Margin to get more out of your Downstream sync rate.

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#518690 8-Sep-2011 17:07

The attainable against acutal is where one is the theoretical based on attenuation and noise margin, the other is reality, I would describe your close enough to not worry.

Cyril

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