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250 posts

Master Geek
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Technical Solutions Aust
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Topic # 111623 9-Nov-2012 13:00 Send private message

Hi There,

I was wondering if anyone with a bit more knowledge on ADSL stats than myself could look at these and tell me if there are any areas for improvement.

Background: Business connection, ADSL2+ delivered from exchange a few KMs away (no cabinets) - no option for VDSL, no UFB for the next three years, and only business fibre available at approx $1000 a month for their needs (Not an option for that price)



My main concern is that I feel we should be able to connect a little faster than 9mbits down... 
Also I see a few errors (not sure if that is abnormal)

Thanks for any help

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15566 posts

Uber Geek
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Vodafone NZ
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  Reply # 714631 9-Nov-2012 13:03 Send private message

What modem are you using and have you got a master splitter installed?






250 posts

Master Geek
+1 received by user: 8

Technical Solutions Aust
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  Reply # 714637 9-Nov-2012 13:05 Send private message

It's a TP Link TD-8840 and yes, master splitter is in play.

1036 posts

Uber Geek
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  Reply # 714647 9-Nov-2012 13:11 Send private message

you haev interleaving on low setting, get it taken off and you should save about 10 msec latency and i've found sync rate tends to go up a megabit or two.

you're far away from exchange so your sync rate is mostly just impaired by the interleaving. although your upload speed is of some concern - even that distance away you should be getting 900+.

assuming it's the original td8840 model (they changed chipsets from broadcom to trendchip i think it was) you can tweak the snr margin on the modem that persists until you reboot.  (although those modems are pretty stable) although your error rate is a little high on the downward direction already.

still, even if you both dropped interleaving, and snr tweaked you could probably only get up to 13 megabit or there abouts, and you may just want to get a second dsl connection installed.

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Uber Geek
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Orcon
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  Reply # 714650 9-Nov-2012 13:13 Send private message

Are you using a phone on that line?  If not; you could eliminate the splitter and connect the DSL modem right up to the incoming copper.  It might speed things up a little (did for me).

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Uber Geek
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Vodafone NZ
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  Reply # 714653 9-Nov-2012 13:16 Send private message

ubergeeknz: Are you using a phone on that line?  If not; you could eliminate the splitter and connect the DSL modem right up to the incoming copper.  It might speed things up a little (did for me).


Good idea if using naked BB




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Uber Geek
+1 received by user: 39


  Reply # 714655 9-Nov-2012 13:20 Send private message

Actually comparing to my adsl line with interleaving off you get a LOT of errors.

Total ES: 3945 7
Total SES: 0 0
Total UAS: 39 39

Check how a phone sounds on the line?  It's usually easier to get voice problems fixed than adsl problems.



250 posts

Master Geek
+1 received by user: 8

Technical Solutions Aust
Subscriber

  Reply # 714670 9-Nov-2012 13:36 Send private message

Thanks for all the replies guys. There is a fax installed on the line. There doesn't seem to be audible line noise, but this is an old office building so wiring could be toast somewhere along the line.

I thought the U/L bandwidth was a bit low...

I will try some of the suggestions and see what I turn up....



250 posts

Master Geek
+1 received by user: 8

Technical Solutions Aust
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  Reply # 714673 9-Nov-2012 13:41 Send private message

further information.... this is supposedly 1.7km's from the exchange, as the car drives (so in this case it's probably a little bit less really) - does the attenuation in this case seem reasonable?

Thanks again

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Uber Geek
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  Reply # 715350 11-Nov-2012 04:19 Send private message

Downstream line rate is reasonable for the amount of attenuation, maybe a little lower than expected but nothing unusual given quality of phone wiring in NZ. 32dB attenuation implies around 2km distance but of course phone cables don't always follow direct paths.



250 posts

Master Geek
+1 received by user: 8

Technical Solutions Aust
Subscriber

  Reply # 715729 12-Nov-2012 11:34 Send private message

Ragnor: Downstream line rate is reasonable for the amount of attenuation, maybe a little lower than expected but nothing unusual given quality of phone wiring in NZ. 32dB attenuation implies around 2km distance but of course phone cables don't always follow direct paths.


Thanks Ragnor... that is exactly the info I was hoping for... so it pretty much looks like I should just focus on ridding myself of the errors and that is the best I can hope for

Cheers

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Uber Geek
+1 received by user: 39


  Reply # 715753 12-Nov-2012 12:02 Send private message

Evilg:
Ragnor: Downstream line rate is reasonable for the amount of attenuation, maybe a little lower than expected but nothing unusual given quality of phone wiring in NZ. 32dB attenuation implies around 2km distance but of course phone cables don't always follow direct paths.


Thanks Ragnor... that is exactly the info I was hoping for... so it pretty much looks like I should just focus on ridding myself of the errors and that is the best I can hope for

Cheers


with a good line you'd be looking at around 12 to 14 megabit sync rate for 2km, and 1 megabit sync up.  so bad line to good line is about 50%

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Uber Geek
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  Reply # 715828 12-Nov-2012 13:34 Send private message

If you want to try eek out a few more Mbit on the downstream look into where the line comes into the building (usually a small plastic box called an ETP) and look at the feasibility of running new Cat5E straight from there to where you want the DSL jack for the modem bypassing/disconnecting all other existing phone wiring.

Ideally the master filter should be as early as possible.







250 posts

Master Geek
+1 received by user: 8

Technical Solutions Aust
Subscriber

  Reply # 716282 13-Nov-2012 12:01 Send private message

Thanks for your help everyone.

I have changed filters, and removed the incoming cable (from the building core, not the ETP) from a dodgy old metal punch down block, and joined it directly to the extension cable with the modem on it (using scotch connectors)

Stats are now a solid 12mbs down and 1 up .... I'd call that a win.

I am still getting errors, but there don't seem to be as many and it doesn't seem to impact the connection much so I will just keep an eye on them.

Thanks everyone for the help

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