Noise on phoneline when ADSL online (last 5 weeks) Page 1 / 6

sighkick, Sep 21, 8:47am
Noise on phoneline when ADSL online (last 5 weeks) I am hoping that someone can offer a solution to my problem. --- For the last five weeks (approx) I have had a continuous hiss on my phone line. This is not to be confused by the usual 'water in the phone lines' problem we have all suffered at some time or other. This noise is not bad enough to make conversation impossible but I also use a dial-up account and I get around 31.2kbps connection speed! Worst of all, the noise is not 24/7 and occasionally its 100% perfect. - - I plugged in a older ADSL modem and the line was clear, so I figured it must be the modem - wrong! I purchased a brand new Linksys 160N and the darn noise is still there. Chorus came around today and checked out my in-line filter - perfect. Unplug the ADSL modem and the hiss has gone!

sighkick, Sep 21, 8:50am
The question is.What has changed in the last 5 weeks?

Is it the installation of ADSL2+ roadside cabinets?

Is it the frequencies being utilised that are bleeding back into my phone lines?

Is anyone else having this problem?

Will you check out the system at your house please - TIA


hfdavis, Sep 21, 9:13am
Had anyone put up an electric fence or has there been heavy rain?

sighkick, Sep 21, 10:23am
Hi hfdavis I am in the middle of a city suburb and the noise on the line is NOT the usual crackle associated with water on the lines. As mentioned above, the line becomes clear when I unplug the ADSL modem. The noise IS being caused by the ADSL modem and I have tried a Dynalink, Netgear and a brand new Linksys 160N - all the same. So to re-iterate, no modem, all clear, plug in modem, continuous 'hiss' noise present. The question is, why are the modems back-feeding this hiss now - what has changed? I would put it down to a wider band of the sound spectrum being used to carry the more powerful ADSL 2+ but how can I prove that? Is it a coincidence that my problems started roughly when they started rolling out Roadside Cabinets for ADSL 2+ ?

baker-assoc, Sep 21, 10:24am
It could be a lines issue then best bet would be to report this problem to your isp who will then get a chorus tech to check your line for noise

sighkick, Sep 21, 10:30am
Hi baker-assoc I have had a Chorus tech here today as stated above. He checked the line without my ADSL router attached and the line was clear. He even checked out my in-line filter (as stated above). It is caused by something that has changed in the last 5 weeks. It is only present when I have the ADSL Modem / Router plugged in. It is 'probably' something to do with the wider (lower) spectrum of sound being used and by-passing the filter. Any Telecom / Chorus gurus around? p.s. we don't use electric fences in the suburbs :)

spyware, Sep 21, 11:00am
Isn't a master/splitter filter at demarc a better idea.

sighkick, Sep 21, 11:19am
Hi spywareNot sure what you are suggesting here? I have an in-line filter which is effectively at the demarc point. I have brought the demarc point inside so that the splitter is nice and dry rather than in a damp plastic box on the outside of my house. So the phone line comes in to this master point that has the splitter inside with a socket for ADSL and one for regular phone. The filtered line then goes to the other phone outlets around the house. The Chorus technician had no problem with the installation which was in itself done by a Telecom Technician. What we need now is not another technician but a GURU SENIOR TECHNICIAN.

boobeer, Sep 21, 12:00pm
HI, Sighkick what it could be is the type of phone you got. Does it happen on all your phones or just the 1? and there is another thing that could be causing it, which is your modem cables being close to a muilti power adapter or power plugs from other devices. There is another trick that could be done aswell, you could try putting a inline filter into the dedicated DSL jacpoint before it reaches your modem, having it dual filtered in a way. ( This may slightly slow your DSL speed down though ) Let us know how you get on.

olack, Sep 21, 12:14pm
Yeah yeah its bad noise ehcrash internet and take me for a walk aye.

resolutionx, Sep 21, 1:02pm
Have you consideredThe modem itself -most domestic modems only come with a 1 year guarantee - a power surge down the phone line can do a lot of damage to modems plus most are pretty cheap/nasty electronics

drcspy, Sep 21, 4:37pm
have you considered getting soem reading glasses ?........the original poster states very clearly TWICE that they bought a NEW modem after this issue started......duh !

boobeer, Sep 22, 2:47am
Lol ........

sighkick, Sep 22, 3:00am
Update.In no particular order: I have tried THREE DIFFERENT MODEMS -- the old Dynalink, the Netgear DG834G and also the new Linksys 160N.--- Point two - the layout of all the power cables, UPS and powerbox strip outlets has remained constant for about 4 years. Point three - the problem only started 5 weeks ago, nothing has changed in at least 4 years (using same phone(s) - usually only one connected). Point four - - the only thing that has changed in those five weeks is that New Plymouth is being fitted with Roadside Cabinets and ADSL 2+ is being livened on some peoples lines (not mine yet). Telecom seems to be the culprit here but I need to prove it. I will try the double filter idea when I ask for my filters back from a friend. The ADSL modem seems to be now generating a lower frequency hiss that is being allowed through the filter back into the phone system. HELP - AM I THE ONLY ONE?

sighkick, Sep 22, 3:03am
Oh and point finalThe Telecom (Chorus) engineer heard the hiss on his own phone equipment. So it's not the phone.

richms, Sep 22, 3:24am
You may have changed nothing, but you may now be on a cabinet which will give you higher signal levels.

If you dont have a proper install then get one, plug in filters tend to suck.

sighkick, Sep 22, 3:48am
Hi richmsI think I may have mentioned more than once that I have a proper install with a proper in-line filter so that plug-in filters are not required in my house. Yes, I may have higher signal levels, but the filter should still take care of the audio signals being back-fed into my phone lines from the ADSL router. p.s. I personally have done the City and Guilds (London) Radio & Line Communications Diploma and more recently did my computing degree with emphasis on Networking. My whole system is professionally installed by Telecom engineers and maintained by myself. But, this one has me beat. p.s. only blowing own trumpet to avoid the more obvious suggestions.

boobeer, Sep 22, 4:25am
Hi again So does that mean you have tried a different phone? because the techs phones will always hear other frequincies and tones, and what type of phones do you have? have you got any without a power source to try. As a DSL tech we get these type of faults maybe 3 times a week, and they usually seem to be related to a power induction causing the dsl frequincy to induce at a lower rate through the filter or usually the modem/phone the customer has. 1 last thing! when you change the modems are changing all the cables as well? I only ask because it might be something as simple as a dodgy line or power cord. Let us know...

david13, Sep 22, 4:28am
i Agree I would try the inline filter just for test purpose in case your inline filter has died i have replaced an inline after a lightning storm but that was pretty major damage in the street the telecom Grey junction units got melted :-(

boobeer, Sep 22, 4:37am
Well I would ask for a Tech to come and fix it! If you are confident that your equipment is ok I would get them in. If you do, write down everything you have done and pass it to the tech when he turns up. There are plenty of isolation tests that a tech can do, and a good tech should be able to rectify your problem. P.S Telecom will try and scare you with the $81 bill, and tell them you just want 1 out.

sighkick, Sep 22, 4:47am
Just to re-iterateThe inline filter was temporarily replaced with a brand new one and the results were the same. I have just removed the Alcatel phone that is normally the only one connected and done a test using a Pert Phone and the noise is still there. So it is NOT the filter (tested by replacement with a new item), it is NOT the phone (just checked with a phone not normally in circuit) and the tech has already been and not charged me for coming in the house (very kind Philippeans guy). Oh, I do not have a spare plug-in filter right now, but will test that theory when I get one of mine back. Please read the whole thread as I have repeated myself many times but thanks for your input ;)

david13, Sep 22, 4:58am
Information Sorry "He even checked out my in-line filter" was not as clear as "temporarily replaced with a brand new one" i have had them check them in the past by just redoing the terminations on the filter

newbie5, Sep 22, 5:03am
Sighkick it sounds to me to be a Telecom fault as you have not changed anything and the fault only started with an upgrade to their cabinet.
telecom will always tell you that it must be your system that is at fault but stick to your guns and say it is theirs.I have done that before and in the end got the fault fixed

sighkick, Sep 22, 5:12am
Thanks peopleSorry that my original mention of the in-line filter was not perfectly clear - my bad. Also, yes mber2, it must be their problem and, to be honest, was hoping that a senior Telecom engineer may just frequent these boards and be able to offer a reason for this problem. It definitely has something to do with increased signal levels and possibly a widening of the ADSL bandwidth frequency wise.

boobeer, Sep 22, 5:34am
What Im trying to say is, I would get the tech back around. I am a senior tech and considered a DSL expert in my area. You definetly have a problem and it is the techs responsibility to identify it, as the isolation tests have showen it is only while the modem is in sync. And with the changing of modems, rules out that possibility. It could be a number of things and I hope that double filtering fixes this for you.

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