(Two) Zyxel p870h modems cannot establish VDSL line sync, Energy Imports modem works fine

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › (Two) Zyxel p870h modems cannot establish VDSL line sync, Energy Imports modem works fine

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'That VDSL Cat'
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#1024017 12-Apr-2014 15:27

geostuff:
hio77: get this done.

it might improve things slightly, but looking at your line, you should not even been allowed to get VDSL.

count your lucky blessings and buy a modem that goes nicely on it.

different modems will sync differently, different modems are good for different lengths, different modems are good and bad for if its exchange or cabinet vdsl.

your not going to magically fix your current modem.

As I just mentioned, replacing the cable that runs to my house from the street will barely do anything for my line stats. It would involve digging a 300mm deep trench 25m long through established gardens, retaining walls and under a bit of concrete - not much fun and quite expensive for very little reward (if any), considering the line stats at the street are damn close to what I achieve at the house already.

I've been told that Chorus will allow a VDSL connection right down to a 15Mbps DS sync rate before they will recommend you move back to ADSL2+. If this is the case, my attenuation could be much worse and still get VDSL - as I sync at 21Mbps with the Huawei or Technicolor modems.

due to your attenuation, you shouldnt have been allowed it. not your sync rates.

if you feel that cable shouldnt be replaced, so be it.

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geostuff

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#1024018 12-Apr-2014 15:36

hio77: due to your attenuation, you shouldnt have been allowed it. not your sync rates.

if you feel that cable shouldnt be replaced, so be it.

I was seriously considering it before I did the test at the street, but it seems it's not going to help much if at all. I will thank the telecommunication gods in a silent ritual for what I've got! Maybe I'll sacrifice a modem under the next full moon to gain their favour...think that might get me fibre a wee bit faster?

RunningMan

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#1024047 12-Apr-2014 16:44

Do you know what your downstream attenuation was on ADSL?

geostuff

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#1024082 12-Apr-2014 18:13

RunningMan: Do you know what your downstream attenuation was on ADSL?

You know I sure wish I did! I never wrote the stats down before I made the switch, but I do know that it was less than it is now on VDSL and the downstream attenuation was similar to the upstream. If I had to take a stab at it, on ADSL I had somewhere around 15dB upstream and downstream.

hio77

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#1024084 12-Apr-2014 18:15

geostuff:
RunningMan: Do you know what your downstream attenuation was on ADSL?

You know I sure wish I did! I never wrote the stats down before I made the switch, but I do know that it was less than it is now on VDSL and the downstream attenuation was similar to the upstream. If I had to take a stab at it, on ADSL I had somewhere around 15dB upstream and downstream.

assuming you didnt switch providers, you could possibly find out if you ask.

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geostuff

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#1024087 12-Apr-2014 18:20

hio77: assuming you didnt switch providers, you could possibly find out if you ask.

Really? I'm on it...

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geostuff

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#1024092 12-Apr-2014 18:31

Slingshot doesn't have any records of my previous upstream attenuation on ADSL, but my downstream was 17.5dB.

Apparently right this moment the DSLAM is showing my DS attenuation at 16dB (US at 40dB).

geostuff

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#1024096 12-Apr-2014 18:43

No-one can seem to explain why on VDSL my upstream attenuation more than doubled either - I don't suppose anyone has any ideas what could cause that to happen?

hio77

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#1024097 12-Apr-2014 18:45

geostuff: No-one can seem to explain why on VDSL my upstream attenuation more than doubled either - I don't suppose anyone has any ideas what could cause that to happen?

VDSL upload attenuation will be higher. the upload blocks are higher in the spectrum, thus they attenuation faster, landing a higher value.

downstream attenuation is the only figure we look at..

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geostuff

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#1024099 12-Apr-2014 18:53

hio77: VDSL upload attenuation will be higher. the upload blocks are higher in the spectrum, thus they attenuation faster, landing a higher value.

downstream attenuation is the only figure we look at..

That makes sense. Interesting that my upstream speeds are at (what the Chorus tech said was) the maximum possible (10Mbps) despite the fact that it is high in the spectrum (and thus more subject to degradation).

hio77

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#1024102 12-Apr-2014 19:03

geostuff:
hio77: VDSL upload attenuation will be higher. the upload blocks are higher in the spectrum, thus they attenuation faster, landing a higher value.

downstream attenuation is the only figure we look at..

That makes sense. Interesting that my upstream speeds are at (what the Chorus tech said was) the maximum possible (10Mbps) despite the fact that it is high in the spectrum (and thus more subject to degradation).

generally, unless distance is just too far.. upload issues are due to internal wiring rather than anything else.

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RunningMan

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#1024108 12-Apr-2014 19:22

geostuff: Slingshot doesn't have any records of my previous upstream attenuation on ADSL, but my downstream was 17.5dB.

Given the max downstream attenuation for a successful VDSL instal is usually 10.8dB for ADSL, you shouldn't really have had it installed - you're significantly beyond the usual reach, so the fact that some modems do actually connect is a bonus.

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#1024144 12-Apr-2014 20:12

When you say 'Trurip' do you mean two wires that are bonded together and are not rwisted that go from the house to the pole?

This cable is INCREDIBLY detrimental to DSL is general. Even more so with VDSL. The impedance is no good. You need to have it replaced with a decent 049 aerial lead-in.

24Mbps is rubbish for VDSL so you must be a good distance from the cabinet. But I almost must say VDSL is turning to sh1t now that everyone man and his dog has discovered it exists 5 years after it was all installed.

geostuff

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#1024153 12-Apr-2014 20:34

chevrolux: When you say 'Trurip' do you mean two wires that are bonded together and are not rwisted that go from the house to the pole?

This cable is INCREDIBLY detrimental to DSL is general. Even more so with VDSL. The impedance is no good. You need to have it replaced with a decent 049 aerial lead-in.

24Mbps is rubbish for VDSL so you must be a good distance from the cabinet. But I almost must say VDSL is turning to sh1t now that everyone man and his dog has discovered it exists 5 years after it was all installed.

Yes, they are not twisted pairs, but there are four of them in total bonded together in a black outer jacket. I always knew that cable could be a large source of problems, that's why I performed those tests at the pole to completely eliminate my wiring as the cause of any problems.

All of my services from the street are buried from where they leave the pole, and as it turns out both my AC power and DSL/phone cable are buried straight into the clayey soil without any conduit or other protection. The phone cable was run directly alongside the AC power feed from the top to the base of the pole; I managed to get a Chorus tech to relocate the phone cable the other day so that it is as far away from the AC power (and associated EM fields) as possible - this was when I got him to let me test my modem at the pole.

Personally I wouldn't opt for the aerial lead-in because of the look of it; I quite like having all my services buried, so if anything I'd run a cat 6A cable (or outdoor equivalent??) in plastic conduit from the pole to my house, if Chorus would let me. I'd try to use the same conduit that would be needed for fibre if possible, in an attempt to streamline future upgrades.

Anyone know the appropriate high-quality twisted pair cable to use if I want to bury a new lead-in? Is there a specific type of conduit that gets used for UFB fibre installs, so I can make the fibre upgrade easier when the time comes?

geostuff

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#1024154 12-Apr-2014 20:36

Also, isn't impedance (resistance) directly related to attenuation? If so, my attenuation figures didn't get much better by eliminating that cable altogether when I tested my connection by hooking up a modem at the power pole.

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