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255 posts

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Topic # 84609 3-Jun-2011 11:28
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Hi,

I've just upgraded the router at my kids school and we have the following stats from the connection:


Trained Mode:            G.992.5 (ADSL2+) Annex A

TC Mode:                 ATM

Selftest Result:         0x00

DELT configuration:      disabled

DELT state:              not running

Trellis:                 ON                       ON

Line Attenuation:        13.0 dB                  6.9 dB

Signal Attenuation:      13.0 dB                  6.5 dB

Noise Margin:            15.0 dB                 16.7 dB

Attainable Rate:        18780 kbits/s            945 kbits/s

Actual Power:            19.0 dBm                12.2 dBm



DS Channel1     DS Channel0   US Channel1       US Channel0

Speed (kbps):             0            15378             0               945



They are having speed issues with National Standards testing and I'm trying to extract everything we can from the connection. Any suggestions for optimisation or comments on the stats appreciated.

Also would like an estimation of VDSL2 connection rates given the line stats above.

Thanks,
Jonathan 

 

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  Reply # 477366 3-Jun-2011 11:44
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Connection stats look fine, 13dB attenuation is approximately 1km of copper from the cabinet/exchange to you.

Your issue could be an ISP issue or just general saturation of your upload bandwidth, you are not going to get much higher real world upload than your current rate on ADSL2+.

Do you have a firewall/gateway doing outbound traffic management or prioritisation?  If not you should.

What ISP are you using eg: Telecom SchoolZone, Slingshot/Callplus, Watchdog, other?

The Telecom Wholesale service target for VDSL2 is 40Mbit/s down and 8-10Mbit/s up but you need signal attenuation lower than 10dB last time I checked.  VDSL2 over Telecom Wholesale isn't being offered by many ISP's yet.

It's possible your wiring could be looked at you may be able to achieve below 10dB attenuation with some work.

What area/location are you in?  Check exchange/cabinet details on:
http://www.telecomwholesale.co.nz/maps  

Telstrclear also offer VDSL2 off their own equipment to businesses and schools but their coverage area is limited.  You'd probably need to contact them for details.

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  Reply # 477751 4-Jun-2011 14:54
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With 13dB downstream attenuation you will not get an improvement with VDSL2. Your upstream at 945 kbits/s might have room for an extra 50kbit or so, check the quality of the school's internal wiring on that line. We don't have Annex M in NZ yet, so thats probably the only way to improve it.

Like Ragnor said, upstream traffic shaping could make a big difference. Or you could investigate the expensive SHDSL business-grade plans.




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^



255 posts

Ultimate Geek
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  Reply # 478498 7-Jun-2011 12:31
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Ragnor: Connection stats look fine, 13dB attenuation is approximately 1km of copper from the cabinet/exchange to you.

Your issue could be an ISP issue or just general saturation of your upload bandwidth, you are not going to get much higher real world upload than your current rate on ADSL2+.

Do you have a firewall/gateway doing outbound traffic management or prioritisation?  If not you should.

What ISP are you using eg: Telecom SchoolZone, Slingshot/Callplus, Watchdog, other?

The Telecom Wholesale service target for VDSL2 is 40Mbit/s down and 8-10Mbit/s up but you need signal attenuation lower than 10dB last time I checked.  VDSL2 over Telecom Wholesale isn't being offered by many ISP's yet.

It's possible your wiring could be looked at you may be able to achieve below 10dB attenuation with some work.

What area/location are you in?  Check exchange/cabinet details on:
http://www.telecomwholesale.co.nz/maps  

Telstrclear also offer VDSL2 off their own equipment to businesses and schools but their coverage area is limited.  You'd probably need to contact them for details.


Hi Ragnor,

Thanks for the feedback. The next step is to implement a firewall/gateway upgrade, at the moment we are looking for the raw bandwidth they need for the e-asTTle testing.

They are currently with Vodafone, if we can get the required performance from ADSL2+ we will recommend a move to Kuranet from Snap as it seems to be the best deal for schools.

I thought VDSL2 at 1km offered better speeds than ADSL2+? Are you saying that is not the case? Which profile are Chorus using do you know?

According to the maps they are connected to MAB/Z which is due to get VDSL2 this month. I have checked with Telstraclear and they don't offer the service in this area.

Cheers,
Jonathan
 



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Ultimate Geek
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  Reply # 478500 7-Jun-2011 12:34
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webwat: With 13dB downstream attenuation you will not get an improvement with VDSL2. Your upstream at 945 kbits/s might have room for an extra 50kbit or so, check the quality of the school's internal wiring on that line. We don't have Annex M in NZ yet, so thats probably the only way to improve it.

Like Ragnor said, upstream traffic shaping could make a big difference. Or you could investigate the expensive SHDSL business-grade plans.


The school's budget doesn't stretch to the more expensive options. As I mentioned to Ragnor i thought that at 1km VDSL2 did offer an improvement. To get an answer I suspect we would need to know the profile that Chorus use as this seems to determine the falloff rate. 

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  Reply # 478508 7-Jun-2011 12:46
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Is the school eligible for the KAREN network ?
http://karen.net.nz/home/




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  Reply # 478518 7-Jun-2011 13:02
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xpd: Is the school eligible for the KAREN network ?
http://karen.net.nz/home/


Kuranet gives Karen access. For schools the barrier for entry for a dicrect Karen connection is usually too high. 



255 posts

Ultimate Geek
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  Reply # 478521 7-Jun-2011 13:05
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wjw:
xpd: Is the school eligible for the KAREN network ?
http://karen.net.nz/home/


Kuranet gives Karen access. For schools the barrier for entry for a dicrect Karen connection is usually too high. 


Agreed, the school does not have the budget for a fibre connection, plus Karen fees on top of existing internet costs. 

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