Kitz Forum
Broadband Related => Telephony Wiring + Equipment => Topic started by: hushcoden on December 07, 2019, 09:26:44 AM
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I'd like to understand if anyone has ever tried those cat5e or cat6 twisted pair cables for VDSL which (allegedly) should provide less errors and perform better than a standard flat DSL cable...
I decided to give it a try and I bought 3x different cables from 3x different vendors and all of them sync 2/2.5 Mb/s less than the standard flat cable ???
Curious to know if anyone has had similar experience...
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1. Have you gone back to the old flat cable and confirmed it is still syncing at the higher speed?
2. Did you do a resync with the old cable to confirm the speed of a fresh sync before you started experimenting? If your last sync was in the middle of the day when background noise is low and you did your experiments in the late evening then noise margin may be lower and so a new sync using any cable would be slower.
3. If you did a lot of disconnects and resyncs when you swapped cables in a short space of time, DLM may have taken the hump and put you on a higher target noise margin which would reduce your speeds.
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Yes back to the flat cable and sync is higher... But I'm not worried to lose 2Mb/s, just interested in understanding whether the cat5e/cat6 could really reduce the line errors...
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Yes they can, but it depends where your line is picking up interference from.
In most cases interference will happen on the BT side, outside the house.
If the flat cable syncs better, I'd stick with it.
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Never tried CAT5/6, though I did buy the shortest RJ11 cables I could and gained 2Mbit that way. Worth it.
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And could the difference in sync speed be related somehow to the fact that the standard flat cable is a 2-pin cable whereas the cat5e ones are 4-pin cables?
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I suppose its possible those extra wires could act as an antenna. I specifically bought short RJ11 cables designed for DSL.
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I suppose its possible those extra wires could act as an antenna. I specifically bought short RJ11 cables designed for DSL.
Something like this (http://www.run-it-direct.co.uk/adsl-vdsl-patch-leads/) would be right ?
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Something like this (http://www.run-it-direct.co.uk/adsl-vdsl-patch-leads/) would be right ?
I honestly wouldn't bother, there's a slim chance it will make any difference at all.
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I'd like to understand if anyone has ever tried those cat5e or cat6 twisted pair cables for VDSL which (allegedly) should provide less errors and perform better than a standard flat DSL cable...
I decided to give it a try and I bought 3x different cables from 3x different vendors and all of them sync 2/2.5 Mb/s less than the standard flat cable ???
Curious to know if anyone has had similar experience...
it all depends on the length of cable
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Yes back to the flat cable and sync is higher... But I'm not worried to lose 2Mb/s, just interested in understanding whether the cat5e/cat6 could really reduce the line errors...
yes it can it is twisted pair less cross talk
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me myself is using cat6 cable from telephone drop wire to splitter and from splitter to modem. These twisted pair cables are designed for higher frequencies and twisted pair cables are better less cross talk
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Thanks all, always good when I learn new stuff ::)
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i built these cables myself i bought 10-20 6p6c rj11 or rj12 connectors and cat6 cable. I tired both 23awg and 24awg cat6 cables zero difference because of few meters length so i suggest go with 24awg cat6 cable solid copper core and here is good guide
https://www.youtube.com/watch?v=z3SESmJ6W-M
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it all depends on the length of cable
It doesn't all depends on cable length, there is also conductor size, conductor quality, quality of termination, quality of contacts.
But mostly all moot if you aren't having any interference in the house to begin with.
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It doesn't all depends on cable length, there is also conductor size, conductor quality, quality of termination, quality of contacts.
But mostly all moot if you aren't having any interference in the house to begin with.
yes it is true and it was in my mind but i dont know why i forgot to mention in my post
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Hi
yes it can it is twisted pair less cross talk
Typically cross talk isn't a problem in the home because the line usually isn't running along side any others to cross with.
The only thing twisted pair 'patch cable' will help with is if the line in the home from the socket to the modem is picking up interference locally, again often not the case over such a short run. Twisted pairs don't stop interference, the twists are there to ensure each wire picks up the same amount of interference. Provided the interference is the same in both wires, it gets cancelled out. So just a flat cable might twist and turn enough to do the same thing. Interesting article here https://en.wikipedia.org/wiki/Twisted_pair, twisting cable essentially started back in the 1880s on telegraph poles.
Other things that may make more of a difference is conductor size and quality of the connections, but only if the previous cable was particular poor.
Also just the fact the cable is a different length, i.e shorter OR longer even can improve or degrade the connection slightly, this is all to do with reflections of the signal and if it is in phase or out of phase etc and impedance changes. Very much a black art and no one size fits all.
Regards
Phil
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As the Wiki article states twisted pair was invented by Alexander Graham Bell. Specifically it appears in his telephone circuit patent of July 19 1881, which shows two wires twisted together and labelled 'a' and 'b'. Sounds vaguely familiar...
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I use cat5e pure cooper from my master sockets to extension socket (approx 10 meters) which I done myself (all extension wiring in my house are aluminium, good know why where house it's just 2 years old). After I done this quality of my line improve a loot. From socket to modem I use 50cm pure cooper cable, if I don't tweak snr eci modem sync with 78Mb/s , max 79Mb/s. If I tweak snr (-0.8 db) I got full 80Mb/s.