VDSL downstream upstream rates

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Wingede

33 posts

Geek

#128867 26-Aug-2013 16:56

Hi all,

I've been on VDSL for a while now and generally happy with everything. Something that occurred to me during my transition was the attainable downstream rate .. I expected it to be higher.
I am approximately 340 metres from the cabinet (but understand this doesn't mean I am)

Another user who recently posted re their connection http://www.geekzone.co.nz/forums.asp?forumid=49&topicid=127488 who looks like they are using the same router as myself... the stats are very similar but there ate 40mb+ where I am low 30mb.

Attached is my router information for comparison - can someone inform me that this is what I should expect or if something isn't quite right?

BTW, xdslctl info stats im on Profile 8b

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30853 posts

Uber Geek

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Biddle Corp

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#884979 26-Aug-2013 21:19

Those statistics don't provide any useful information. Attenuation and a bitloading graph tell the full story.

How did you base your distance from the cabinet? Remember copper doesn't always take the shortest route.

Wingede

33 posts

Geek

#885150 27-Aug-2013 10:00

Managed to get attenuation figures

Dairusire

298 posts

Ultimate Geek

#885252 27-Aug-2013 13:41

Yeah that is a bit low, I use the same router at home and I'm approximately 600 odd meters from the cabinet but I get 42mb/s down.

When you had your VDSL installed did FFM get chorus to do a complete wiring install? New cable down to a dedicated jack-point with a masterfilter installed?

Wingede

33 posts

Geek

#885264 27-Aug-2013 14:00

I declined the option to have chorus do a master filter etc as the house was new and since we put 20+ ethernet ports in the house into a patch panel we had one of computer dynamics's xdsl filter's installed on the incoming telecom lines into one of the patch panel ports. So didn't see a need to do that since we future proofed a bit from the start.

Talkiet

4792 posts

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Trusted

#885267 27-Aug-2013 14:01

Wingede: I declined the option to have chorus do a master filter etc as the house was new and since we put 20+ ethernet ports in the house into a patch panel we had one of computer dynamics's xdsl filter's installed on the incoming telecom lines into one of the patch panel ports. So didn't see a need to do that since we future proofed a bit from the start.

It is highly likely that this was your problem.

Cheers - N

Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.

Wingede

33 posts

Geek

#885273 27-Aug-2013 14:06

Yeah certainly is another place to look, unfortunately I don't know what the prequal results where (at least some sort of indication of what it should be). Would rather know this before start ripping things apart.

Would my isp have this information? do chorus generally give this information out on prequal?

Dairusire

298 posts

Ultimate Geek

#885276 27-Aug-2013 14:15

Wingede: I declined the option to have chorus do a master filter etc as the house was new and since we put 20+ ethernet ports in the house into a patch panel we had one of computer dynamics's xdsl filter's installed on the incoming telecom lines into one of the patch panel ports. So didn't see a need to do that since we future proofed a bit from the start.

In that case do you have your connection running into the patch panel?

If you did, your issue could lie there, as we've seen quite a few connections somehow randomly being impacted when they've been run through a patch panel for some reason. Not entirely sure as to why (possibly difference between a data patch panel and phone patch panel???), what I would do is take the xDSL connection off the patch panel and use a dedicated jack. I know it may seem pointless, but it may be your issue.

EDIT: AHA! 111 posts :D

EDIT EDIT: If you PM me your address I can run a pre-qual and get that info for you, just to help get it to yourself faster etc. Either that or just give brendan a call at FFM and I'm sure he will help yah out.

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Dairusire

298 posts

Ultimate Geek

#885282 27-Aug-2013 14:31

I've sent you back those results, also just remember with the download I would take that with a grain of salt, as typically those are a VERY conservative estimate. I had a attenuation of 8dB on my lines when I ran a pre-qual and I'm getting 42mb/s + so yeah...

Wingede

33 posts

Geek

#885319 27-Aug-2013 14:45

Thanks heaps for your prompt reply...

So with the prequal stating 5db in theory this is a good value ? and my sync rates don't necessarily match up ? - I guess what I am trying to ask is.. based on the info at hand there is reason to look at internal wiring ?

Using http://www.speedguide.net/dsl_speed_calc.php as a guide and entering 5db the resulting approximate distance somewhat closely matches distance to the cabinet (362 metres)

Dairusire

298 posts

Ultimate Geek

#885328 27-Aug-2013 14:53

Yes, I believe there is a valid reason to look at internal wiring. Your attenuation is lower than mine and yet I'm grabbing higher speeds, when in reality you should be. I would see if you could get a data technician out at your own cost to check the wiring... Sorry but Chorus can sometimes do a crap job, and you really want a decent job when it's something to do with your home.

If you dont want to drop the cash on getting a tech out, see if you can still get that free wiring and install from chorus...

Wingede

33 posts

Geek

#885334 27-Aug-2013 14:56

Ok - sounds like a plan.

Appreciate your input - many thanks!

Wingede

33 posts

Geek

#886929 30-Aug-2013 10:21

Hi all,

We've bypassed the xdsl filter and noticed no real change in performance.

Question - by doing the above change and powering up the router again if there was to be a difference would you immediately see a change in the "achievable sync rates" or the actual sync rates? - or does it need to go through the retrain process ?

Inphinity

2780 posts

Uber Geek

#886959 30-Aug-2013 10:47

Rate retraining should only be needed to jump profiels (say, from 8b to 17a), but you're nowhere near that stage. A cold-start resync should yield improved line speeds, if the cause for the low speeds has been resolved.

When you sya you have bypassed the filter, do you mean the VDSL modem is connected with no splitter in place?

Wingede

33 posts

Geek

#886970 30-Aug-2013 10:58

That's correct - as we are naked and thinking it might be the splitter we bypassed it.. effectively from demarc straight into a patch panel into router.

Guess next step would be remove the patch panel out of the equation and then look at that cat5e cable from the demarc ?

Failing all of the above I guess then it is something between cabinet and house ?

Dairusire

298 posts

Ultimate Geek

#886972 30-Aug-2013 11:03

Wingede: That's correct - as we are naked and thinking it might be the splitter we bypassed it.. effectively from demarc straight into a patch panel into router.

Guess next step would be remove the patch panel out of the equation and then look at that cat5e cable from the demarc ?

Failing all of the above I guess then it is something between cabinet and house ?

Correct :) If only other people did proper trouble shooting like yourself. On another note though, it wouldn't be impossible for the router to be having a issue?

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