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Topic # 128989 30-Aug-2013 20:39
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So I got my new Snap! VDSL install all done yesterday (Thursday). Took some convincing since my ADSL attenuation was 16 dB with a sync of 12Mbps. Here's my stats on the new VDSL, and my line length is at least 800m if I drew a straight line to the nearest cabinet:







Just a few questions: The chorus tech didn't run a dedicated cable to the VDSL jack from the filter in the ETP, but used an unused pair in the existing Cat 5 phone wiring. I'm 99% sure this is fine given the VDSL only uses 6MHz of bandwidth while the Cat 5 is rated for 100MHz.

He also just repurposed an existing BT phone jack because that wall plate also has a coaxial TV outlet and he wasn't equipped to deal with this. As such I am using an untwisted 1.5M BT to RJ11 cable. I would prefer to use a UTP Ethernet patch cable, but how much of a difference is this likely to make?

Overall though I am fairly happy with the performance of my VDSL, and it's been rock solid since it first came up (Haven't had any DLM resets yet though oddly enough, it's been up for 33 hours)

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  Reply # 887209 30-Aug-2013 20:51
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Just a few questions: The chorus tech didn't run a dedicated cable to the VDSL jack from the filter in the ETP, but used an unused pair in the existing Cat 5 phone wiring. I'm 99% sure this is fine given the VDSL only uses 6MHz of bandwidth while the Cat 5 is rated for 100MHz.

He also just repurposed an existing BT phone jack because that wall plate also has a coaxial TV outlet and he wasn't equipped to deal with this. As such I am using an untwisted 1.5M BT to RJ11 cable. I would prefer to use a UTP Ethernet patch cable, but how much of a difference is this likely to make?


Mine is using existing cat3 from the splitter to the jack, and a regular 1.8m BT to Rj11 cable from jack to router, and I sync at ~62Mbps, so I don't imagine it should make too much difference.




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  Reply # 887223 30-Aug-2013 21:34
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The cable from the cabinet (in the ground) is cat3 or less. A 1.5m line cord will not make a sod of difference.

 
 
 
 


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  Reply # 887662 1-Sep-2013 00:52
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My word. You get that at 800 metres? Colour me green. :(

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  Reply # 887663 1-Sep-2013 00:54
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800m if drawn as a straight line, and I know from experience the cable normally doesn't go straight there.

Heck, in the past I've seen an install appear to be 200m from the cabinet but the cable circled the block meaning 900m in the end.




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  Reply # 887666 1-Sep-2013 01:38
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Yeah, if it's 800m as the crow flies it'll be even longer. My line is about 850M and I get 20/3.7mb :(

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  Reply # 887697 1-Sep-2013 08:53
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@gonetomorrow: That is an extraordinarily good result for a line with 15db attenuation! In addition, the version of firmware you are running defaults to a +1db SNRM modification, and since you are already on DLM1 and your error rate is so low, there is still a lot of room to further tweak your connection.

After your initial 10 day validation period, I would be inclined to try some SNRM tweaking, I wouldn't be surprised if you could achieve a 50Mbit sync.

Note that the firmware you are running is more difficult to mod the SNRM on. There is a method using telnet documented a few pages back but we are working on an easier way as well.



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  Reply # 888298 2-Sep-2013 13:47
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Weird thing is that I started on DLM-1, and I haven't had a single resync since it was first connected (~100 hours). So I'm not sure if I'm even on the validation period, but I guess it could be that it hasn't had any reason to change.

Also, I believe there's room for improvement in the underground cable, as the U/G going to my house actually first goes past to a shed at the back, up into a jack-box where it's gel'd to a second cable that then goes back to the house ETP. My main concern is interference from a bench grinder that's near the box where the cables join. There's enough cable there to run straight to my ETP, removing a few metres and a join. I'm just a bit paranoid about disturbing the cable; the excess is stuffed in a loop that's been there for a few years. I'd hate to unravel it and have the insulation split or conductors break...



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  Reply # 894891 12-Sep-2013 19:16
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Interesting thing, my line had been up since the very first connection with the results in the OP. Now, I just had a resync due to losing power for 3 days (dat wind) and I'm now looking at this:



I've netted an extra 3Mbps for nothing, which I guess is the result of the lower SNRM (10 now). What would cause this to change?

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  Reply # 894946 12-Sep-2013 20:52
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Crosstalk is reduced during power cuts when everyones dsl syncs are down.

When the power first comes back on your line would have been very clean resulting in an above average sync, SNR would have dropped from 12 to 10 as more connections coming back online increasing the amount of crosstalk present.



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  Reply # 894985 12-Sep-2013 22:13
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Could be, but I don't think anyone else is on the line. The nearest house is probably a good couple of KM away.

The other thing I thought of was that the first sync occurred while the chorus tech was still punching down pairs, so I was thinking it could be that as well. I might do another resync soonish to confirm.

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  Reply # 894992 12-Sep-2013 22:37
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Hey if your line is stable and getting a faster sync then before...

I would just leave it alone....

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