FTTC / PowerLine Ethernet - A Warning!
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- Re: FTTC / PowerLine Ethernet - A Warning!
FTTC / PowerLine Ethernet - A Warning!
09-05-2015 1:42 PM
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Here is my warning/tail of woe, over the use of HomePlugs (powerline ethernet) with FTTC.
I had a very good sync (74Mbps) on my FTTC which over time plummeted. Eventually Interleaving was applied to the line, and my FEC/HEC errors started going through the roof. PlusNet/Openreach tried all sorts of things and could not fix the speed for more than a couple of weeks before it would drop like a stone, and errors would take over.
Eventually, through a lot of trial and error, I discovered that the HomePlugs (PowerLine Ethernet) work on/put out interference on the same frequencies that VDSL uses. Immediately after unplugging and re-syncing I gained 2Mbps. 3 days later, my line re-synced overnight back to 74Mbps, and interleaving was turned off.
Hopefully this may help those of you who are seeing similar problems. Of interest, I was using reasonably expensive Devolo homeplugs - not cheap ebay ones...
Good Luck!
James
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 2:15 PM
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I have been noticing the odd burst of CRC Errors Downstream (but None up) which I wondered if might be connected (excuse pun!) to home plugs? Thinking through as I type, I think the clue is in the Errors Down but None Up, Errors created by Home plugs would be perhaps opposite, or both?
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 2:43 PM
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James
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 7:22 PM
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Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 8:32 PM
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Do you know how the interference was getting into the modem, was it from the modems mains power adapter, or via RJ45 port?
I run TP-Link power line adapters and suspected interference could reduce modem speeds. Because of this I run my modem / router via a mains conditioner, see link below. I can confirm these reduce the signal from my power line adapters, however they don't completely eliminate the signal.
http://www.amazon.co.uk/LINDY-Mains-Conditioner-Power-Strip/dp/B00289GSC0/ref=sr_1_2?ie=UTF8&qid=143...
I'm planning on hard wiring my house with RJ45 cable, but it's one of those jobs I keep putting off.
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 9:37 PM
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BT Home Plugs would potentially cause the same problem.
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 9:50 PM
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Quote from: stoswald Could the same apply to the BT home plugs some of us are using?
Yes - I have seen similar problems to the OP with BT home plugs before. Most people seem to use them (along with other models) without any issues at all though - given that I suspect the problems are caused by the frequencies in use for the line or the house wiring (or a combination of both).
I tried using RF chokes on the cables out of interest at the time but it did not make any difference in my case - in the end I just ran a long length of cat6.
Re: FTTC / PowerLine Ethernet - A Warning!
09-05-2015 10:36 PM
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Quote from: SlinkyWizard I'm thinking it was RF interference, as all my kit is behind a UPS so that will be filtering the mains for the router. All the HAM radio guys complain massively about PLE as well because it interferes with their radios.
RF now that's something I never thought of. I do however use a 0.5m twisted pair RJ11 to the modem.
http://www.tandyonline.co.uk/high-speed-rj11-dsl-cable-0-5m.html
How far was the modem from the power line adapter?
Re: FTTC / PowerLine Ethernet - A Warning!
10-05-2015 10:56 AM
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Re: FTTC / PowerLine Ethernet - A Warning!
10-05-2015 11:47 AM
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Through trial and error, I traced it to the powerline networking adapters, which are now reboxed and back in the loft.
As a general note, one of the best things I did was gain access to my line stats (through the unlocked Huawei modem). Having access to so much information can help you diagnose a lot about your connection.
Without the stats, you are virtually working blind.
A useful stat to look at when diagnosing such issues (like powerline adapter noise), is to monitor the FEC graph, and see how the errors drop as you switch things off.
Re: FTTC / PowerLine Ethernet - A Warning!
10-05-2015 11:57 AM
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Re: FTTC / PowerLine Ethernet - A Warning!
11-05-2015 1:58 AM
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Re: FTTC / PowerLine Ethernet - A Warning!
11-05-2015 3:07 AM
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adie:quote
Re: FTTC / PowerLine Ethernet - A Warning!
11-05-2015 11:11 AM
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The homeplug was on it's own socket, with the UPS running the equipment rack on another socket.
Re: FTTC / PowerLine Ethernet - A Warning!
11-05-2015 6:27 PM
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Quote If your BT line is well away from mains circuit then it could explain why your not effected.
My phone socket is about halfway up the wall well away from power lines. Explains that then!
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