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153 posts

Master Geek

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# 106204 19-Jul-2012 13:20
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Does anyone know how to interpret the data displayed on the Spectrum page of the FritzBox 7340.







_Allan (my blogmy tweetscompany tweetscompany web site)
           Geekzone Speedtest  -  Download: 16.28 mbps  Upload: 5.86 Mbps

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202 posts

Master Geek


  # 658553 19-Jul-2012 16:08
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Hi Allan

What would you like to know?

You have a fair bit of signal loss. The downstream band 2 is barely being used due to signal loss.

What is your line Attenuation and length ?

Also how have you set up your wiring to the Fritzbox



I have just marked the basics of the graph.




Hope that helps :)

1458 posts

Uber Geek

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  # 658734 19-Jul-2012 22:08
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Hmm, might steal that for the VDSL Tuning thread :)

EDIT: Actually, if you don't mind mate, could you re-do that spectrum illustration using your own spectrum graph?  Your line stats are textbook and you are on a 17a profile so that will be good for illustrative purposes. :)

Either that or point me to an existing one already on GZ (can't find it ATM) and I'll label it up.

 
 
 
 


202 posts

Master Geek


  # 658790 19-Jul-2012 23:38
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Hey Sam,

I will do the same for my Spectrum and send it through.



153 posts

Master Geek

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  # 658871 20-Jul-2012 08:41
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Napster: What would you like to know?


How do you know where DSL1, DSL2 and  VDSL 8b is mapped?

What should the perfect looking chart look like?

What is DS Band 1, US Band 1 DS Band2?

What is the Pilot reference?





_Allan (my blogmy tweetscompany tweetscompany web site)
           Geekzone Speedtest  -  Download: 16.28 mbps  Upload: 5.86 Mbps



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Master Geek

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  # 658879 20-Jul-2012 08:47
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Napster,

Thank-you for your observation about signal loss.  My installation has been in place for 9 days now.  This is what it looked like on Day 1. The DSL Information altered on Day 2 and for the remaining 8 days has not changed at all.



I have CAT6 cable from the ETP to the telephone jack on the wall.  From the telephone jack to the Fritzbox I am using the supplied lead that came with the modem.

I spoke to Snap a couple of days ago about the disappointing throughput speeds and they said they would do a line check.  I am still waiting for the results of that test?

Any advice you have will be well received!





_Allan (my blogmy tweetscompany tweetscompany web site)
           Geekzone Speedtest  -  Download: 16.28 mbps  Upload: 5.86 Mbps

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Master Geek


  # 659270 20-Jul-2012 18:05
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_Allan:
Napster: What would you like to know?


How do you know where DSL1, DSL2 and  VDSL 8b is mapped?

What should the perfect looking chart look like?

What is DS Band 1, US Band 1 DS Band2?

What is the Pilot reference?



Here are the specification for each technology.

ADSL1   upto 1.1MHz /256 Carriers
ADSL2+ upto 2.2MHz /512 Carriers
VDSL2   upto 8.8MHz /2048 Carriers 8b Band Plan
VDSL2   upto 17.6Mhz /4096 Carriers 17a Band Plan

You can tell what Band is being used by looking at the Spectrum graph. The blue area is your bit loading. All the bits added together = your sync rate.
 
You can see that this is extending past 2.2Mhz and also has a 2nd Band which falls under the VDSL2 specifications. 


VDSL has multiple Downstream and Upstream Bands. They use this method to optimize both Downstream and Upstream speeds.
Signal loss is much greater at higher frequency's and is also affected by increased power on longer lines. 

Not sure on the  Pilot Reference tone sorry.





202 posts

Master Geek


  # 659274 20-Jul-2012 18:09
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This is from my VDSL connection both 8b and 17a. Its not perfect but its close.



17a



8b


 
 
 
 


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Uber Geek

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  # 659281 20-Jul-2012 18:35
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Napster:Not sure on the  Pilot Reference tone sorry.


From the Fritz!box help for that page:
The red marking indicates the pilot tone which is used to synchronize the DSL-Controller with the exchange.

Napster:Here are the specification for each technology.

ADSL1   upto 1.1MHz /256 Carriers
ADSL2+ upto 2.2MHz /512 Carriers
VDSL2   upto 8.8MHz /2048 Carriers 8b Band Plan
VDSL2   upto 17.6Mhz /4096 Carriers 17a Band Plan

You can tell what Band is being used by looking at the Spectrum graph. The blue area is your bit loading. All the bits added together = your sync rate.
 
You can see that this is extending past 2.2Mhz and also has a 2nd Band which falls under the VDSL2 specifications. 


VDSL has multiple Downstream and Upstream Bands. They use this method to optimize both Downstream and Upstream speeds.
Signal loss is much greater at higher frequency's and is also affected by increased power on longer lines.


Awesome stuff dude!  Added to the VDSL Performance thread :)

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