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641 posts

Ultimate Geek
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Topic # 82100 21-Apr-2011 20:21
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Hi there

I was just after a little bit of information about these modem stats if they look normal or not?
Not too far from an exchange and am currently experiencing random disconnects.










DSL Connection
 








Link Information




 
 
 
 





Uptime:
0 days, 6:39:52





DSL Type:
G.992.1 annex A





Bandwidth (Up/Down) [kbps/kbps]:
960 / 7.488





Data Transferred (Sent/Received) [kB/kB]:
0,00 / 0,00





Output Power (Up/Down) [dBm]:
11,5 / 19,5





Line Attenuation (Up/Down) [dB]:
8,5 / 19,0





SN Margin (Up/Down) [dB]:
12,0 / 12,5





Vendor ID (Local/Remote):
TMMB / BDCM





Loss of Framing (Local/Remote):
0 / 0





Loss of Signal (Local/Remote):
0 / 0





Loss of Power (Local/Remote):
0 / 0





Loss of Link (Remote):
0





Error Seconds (Local/Remote):
1 / 0





FEC Errors (Up/Down):
0 / 0





CRC Errors (Up/Down):
1 / 122





HEC Errors (Up/Down):
1 / 79


















 

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1998 posts

Uber Geek
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  Reply # 461453 21-Apr-2011 20:51
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Here's a good site which explains all the stats:

http://hwiki.digitalsouth.net.nz/broadband/attenuationandnoise




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641 posts

Ultimate Geek
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  Reply # 461465 21-Apr-2011 21:27
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corksta: Here's a good site which explains all the stats:

http://hwiki.digitalsouth.net.nz/broadband/attenuationandnoise


Hi thanks for this

I was wanting a little more tech info like the type of dslam etc and if these are regular stats for approx 800m from the exchange

 
 
 
 


635 posts

Ultimate Geek
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  Reply # 461482 21-Apr-2011 23:15
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No disrespect to the person who wrote that wiki, but their description of SNR Margin is fairly poor.  

 

Your modem stats look okay - but they seem to indicate that you're further than 800m from a DSLAM.  Where did you get the 800m stat?  Remember cables are not necessarily laid 'as the crow flies' (or as the person drives) so to speak.  To tell the truth, modem stats only give a snapshot of a point in time, and for intermittent issues aren't usually that helpful.  Best bet is to log a fault with your ISP and they should be able to run a line-test against the line that will give them far more information about what is going on at the ADSL layer of your connection.   

 

I'm surprised that no modems out there offer any real analytics of the ADSL layer ... 




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Uber Geek
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  Reply # 461484 21-Apr-2011 23:24
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Hmm, I have had my noise margin to zero and the connection has still worked ok. The issue is that there doesnt seem to be any rate adjustment happening despite me enabling it on the router do when it finally does dip down too far it drops out. Their idea that 6dB has issues is just nuts since thats where other ISPs have it operating in some cases to get closer the the speed that people expect, not this 12dB insanity that telecom force.




Richard rich.ms



641 posts

Ultimate Geek
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  Reply # 461520 22-Apr-2011 09:15
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cbrpilot: No disrespect to the person who wrote that wiki, but their description of SNR Margin is fairly poor. ?

?

Your modem stats look okay - but they seem to indicate that you're further than 800m from a DSLAM. ?Where did you get the 800m stat? ?Remember cables are not necessarily laid 'as the crow flies' (or as the person drives) so to speak. ?To tell the truth, modem stats only give a snapshot of a point in time, and for intermittent issues aren't usually that helpful. ?Best bet is to log a fault with your ISP and they should be able to run a line-test against the line that will give them far more information about what is going on at the ADSL layer of your connection. ??

?

I'm surprised that no modems out there offer any real analytics of the ADSL layer ...?


Hi thjanks for that, yes I relise that the cable run could be longer I should of said that 800m is a drive by estimate, so what sort of length do you think those stats indicate roughly

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  Reply # 461524 22-Apr-2011 10:08
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Hi, roughly 1.4km is what the 19dB indicates, however that estimation also does not take into account every contributing aspect to the attenuation, ie only simple line attenuation based on 0.4mm cable.

That said you modem is going pretty much as fast as ADSL1 goes. Random disconnections can be for a range of reasons, both attributed to condtions on your side and Telecoms side of the demarc. One thing you can do yourself before calling your ISP (and so Chorus) to look into this, check you house wiring is not conributing to the drop outs.

How many voice/POTS/phone/fax/skybox devices are across the line, have all filters fitted. What happens if you do an isolation test, and even try running with say only one phone(with filter) across the line, or ultimately have a central filter installed with a clean unbroken line from the demarc to the modem.

You say random disconnections, are they actual ADSL disconnections or PPP.

Cyril



641 posts

Ultimate Geek
+1 received by user: 51


  Reply # 461657 22-Apr-2011 18:56
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cyril7: Hi, roughly 1.4km is what the 19dB indicates, however that estimation also does not take into account every contributing aspect to the attenuation, ie only simple line attenuation based on 0.4mm cable.

That said you modem is going pretty much as fast as ADSL1 goes. Random disconnections can be for a range of reasons, both attributed to condtions on your side and Telecoms side of the demarc. One thing you can do yourself before calling your ISP (and so Chorus) to look into this, check you house wiring is not conributing to the drop outs.

How many voice/POTS/phone/fax/skybox devices are across the line, have all filters fitted. What happens if you do an isolation test, and even try running with say only one phone(with filter) across the line, or ultimately have a central filter installed with a clean unbroken line from the demarc to the modem.

You say random disconnections, are they actual ADSL disconnections or PPP.

Cyril


Hi Cyril
thanks for the helpful info and advice, there is currently only two connections, one in for the Thompson modem and one for a phone, however there are more jacks around the house and one in the garage and I'm sure they are daisy chained together, I think the best idea would be to install a master splitter/ filter. How do I tell between a ppp disconnect and actual adsl disconnect?

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