As I am sure others will tell you, all Switch Mode power supply adaptors generate loads of noise if you put a MW radio near them. Question is, is it causing interference to your broadband? I had 6 months of absolute mayhem on ADSL2+ where something was putting something like a 7dB drop in noise margin causing an immediate disconnect when the SNRM was already low several times a day. After a LOT of investigation found it was a faulty switch mode PSU on a PC monitor three doors away! Once fixed, no sign of it.

You really need to watch/refresh the stats in real time for any effect on the noise margin and play around with moving the PSUs around etc. Best graphically using DSLStats or similar - you'll find a lot of info if you Google this.

Just make sure you keep the PSU bricks and leads away from the (as short as possible) lead from the master socket to the modem/router etc and route the mains leads away from the physical modem if you can. Personally I've never had a faulty or any noticeable interference from a Switch Mode PSU and there are 13 of them in my room plus three APC UPS powering one thing and another.

You can see what was hapening HERE back in 2012.

Hi,

I did a bit of testing yesterday. As you said about power supply's making lots of noise I couldn't find one that has the least amount of noise. I tried moving the PSU's around and moved them about 1ft and half away from master socket and it has reduced errors but not as much I would like.

I have taken you advice about dslstats and I am currently monitoring it.

As for the PSU wires they are bundled with the RJ11 cable fro the telephone not the modem. they do meet somewhere as it all in cable tidy wrap. I will have to do a bit re wiring I think with the power cables, and as for the router power cable is really short while the HG612 is really long so it may be a bit of an issue. When I tested yesterday with a radio the huawei PSU's put out the most noise than all of the other AC adaptors I have spare from previous routers.

My main aim is to reduce the errors either completely so FEC and interleaving turn off so I get a higher sync or reduce them to a small amount so hopefully the DLM will de intervene a bit.

Neat coils of power cables are bad as they create stronger magnetic fields.

Power and signal cables should not run close together and parallel because of the magnetic field round the power one. If they have to cross, best done at right-angles.

Have you tried replacing the filter, or double-filtering the phone line? (You haven't got a Sky box anywhere have you?) Is the phone on a plug-in extension lead?

I see you've lost about 10Mbps against max achievable in the process of adding the interleaving and running error correction. I have lost about the same in the 2 months since FTTC was available - started at an actual of 56Mbps down and now at 46Mbps. The loss now seems to be due to cross talk as more connections got added from my cab - and I'm at about 800m distance with an estimate at only 32 or so so guess more drops to come maybe.

Were you higher originally with a gradual series of drops like mine or was it sudden? I had Errored Seconds counts in the many high 100s per hour originally but now down to about 20 max per hour after the DLM has changed the interleave about 6 times. It tried to reduce the interleaving once but that just pushed the Errored Seconds count back up again. Seems happy when it's below 30.

It's interesting that in the past, when there have been power cuts, as I have all the DSL stuff on a UPS I can see what the line looks like under these conditions. With power off just in the lane (it's fed from a different supply to the rest of the village) I see a jump in available SNR margin of about 4dB. If the whole village goes off its 7-8dB! And there is little industrial activity betwen me and the exchange. Shows just how much ambient noise there is.

Ok I will look at what the best option is like you said probably right angle. Is there anyway of shielding power cables? I had a shielded RJ11 cable but it made my SNR go really low and racked up more errors so I switched it back.

If you mean the VDSL Openraech faceplate I have tried the original I removed but the sync seems to go up and down all the time. For double filtering is that where I would plug one of those dangly filters in or install a VDSL faceplate on top of the one I have? No I don't have anything Sky, and no the phone is directly into the master socket.

When I first got fibre the engineer told me it was synced at 26.2Mbps and said hat would the best you will get at this distance, though I have had 26.5Mbps recently as well so It hasn't really dropped as such.

One thing I have noticed it when it synced higher more errors appear a bit like your if a sync slightly lower less errors appear.


This maybe irrelevant but my friend who lives 3 doors down the road from me and served by same cab and dp as me and has FTTC but he is synced at 15000 so giving him 13.5MBps throughput when does tests. So I think he has it bad but then again his telephone looks to be gaffer taped in areas and has mix of wire that looks to be for speakers and modern drop wire. He like me synced at about 26Mbps at first but his has dropped a considerable amount though he has a lower latency than me which does not make sense.

To double filter your phone plug a dangly into the phone socket with the master and VDSL plate fully assembled.

Ok done it