[WXC/VFX] Clicking sound on VFX calls

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coffeebaron

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Topic # 13582 18-May-2007 16:08

I have noticed ocassionally a clicking sound during some VFX calls. This is not just related to VFX though, I have experienced this through other VOIP providers too.
What causes this? I suspect ADSL issues, but could be wrong.
Is this more likely an issue when using G711? Though plenty of bandwidth fs/fs, and nothing else was happing at same time.
Is there a work around to this issue?

It's not a major issue, but if its one that can be resolved (without having to revert to G729), then that would be great!

Will PM a call sample

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maverick

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Reply # 71165 18-May-2007 17:11

Thanks Fraser,

I will take a look and see if I can see what you are hearing

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maverick

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Reply # 71439 21-May-2007 06:59

Hi Fraser,

Took a look at this this morning, the clicking does appear to me to sound like a bad cable connection in a phone at this point, rather than actual transmission, a number of reasons fro that , I sent you a PM showing what we see, I don't believe it is codec related problem. Noise on VOIP line would generally appear with a lost packets unless the noise was being generated else where and the VOIP connection is just transmitting what it receives, but you will see that in the PM on the 7 minute call there was actually no packet loss at all.

The noise actually sound more like a when have a handset with a bad cable connection it's a scratching type of noise, this is my first thoughts but I have asked you a couple of questions in the PM, so will look to see what we can look at next after that.

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Niel

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Reply # 71445 21-May-2007 08:45

Try a different phone, it can be the "hook" switch which is dirty. Low cost and older phones have a switch that directly switches the phone line, digital phones usually have a mechanical switch which is an input to the microcontroller and noise is removed. If the former, then the switch can cause a scratchy noise. I have had that before.

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halfa

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Reply # 71905 23-May-2007 14:51

We had the same thing, with the noise sounding exactly like a regularly ticking clock. It was audible through one of our speakers as well as the phone. We used the process of elimination and discovered it was our printers USB cable to the router.

The solution has been to either turn off the power supply to the printer (still got the noise with the power supply plugged in and printer switched off), or unplug the USB cable.

Keeping cables clear of each other didn't seem to make any difference.

Niel

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Reply # 71909 23-May-2007 15:54

Ah, that is called an earth loop. Everything is connected to earth, but you end up with multiple earth connections and with any magnetic field going through a loop it will induce a current in the loop. So even while everything is connected to earth, there is a voltage induced into the earth wires which causes a difference between different products. It has nothing to do with the quality of any of the products, simply with where your cables are plugged into with the combination of products you have. It can be resolved, but not so easy without seeing your setup.

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coffeebaron

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Reply # 72009 23-May-2007 23:23

Thanks for the tips Niel & Halfa, but I think this one is something else rather than a faulty phone / connection thing. It is very itermittant, but in the couple of years that I've been using VOIP, it's one that has cropped up from time to time. It happens across a range of various hardware & VOIP providers that I have used, so was hopping it was a known issue. The only other thing I can think of is whether my router could be the cause, as that would be the only common factor involved. Using a Dynalink RTA1025W.

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Niel

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Reply # 72020 24-May-2007 07:05

Try turning off WiFi, or turning off SSID broadcast. My DECT cordless phone base station causes a ticking interference and hiss on one wired phone but not when I use a different (business) wired phone, and the noise is only on my receiving end it is not heared by the other party. Moving the phone itself changes the level of interference, but not moving the wires.

Are you rural? If you hear a ticking sound every 1.2 to 1.6 seconds then it is likely an electric fence energizer especially if there is a fault in the fence and it is arcing. The arcing would change with humidity, or a strip grazer would get moved regularly and not always interfere. (Maybe this is not your problem, but might help others.) There is little you can do about this other than fixing the fence fault.

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