atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Mobile Phones & Devices Cell phones interrupting Key system lines

I have a customer complaining of cell phones causing bleed over onto phone system lines. I have not heard it but will make it by soon. They are asking if there are filters on the market for this- Her complaint-
" Is there a filter available that would keep cellular signals from bleeding through to the system. In our office, anyone who leaves their cell phone on, picks up other cell signals, and it bleeds through into their desk phone. (This happens even if they are not connected to another caller via their cell – their cell just has to be turned on).

The result is that calls on our desk lines are interrupted by a buzzing from a neighboring cell phone ring.

If there is a solution to this, please let me know what it is and the cost"

Anyone heard of this happening?

Never heard of this ever . Are the onsite people using wireless headsets ?

Nextel phones cause this, even when not in use. As long as they are simply turned on, they can cause all kinds of chaos on wired phone systems. I have seen this many times. I have never seen any other type of wireless service cause this though. Have you asked the customer to question if the offending phones are Nextels? I'll bet you that they are.

LOL. I can walk through my office with my Nextime Crackberry on my hip and you can follow my path by the sound of the tortured PC speakers. I can tell in any of my vehicles when the phone is goin to ring because it distorts the FM radio reception. I'm with Ed on this..

We have had this happen with Cingular phones also.

If the cell phone is really close to the handset cord of the wired phone.

Darrell may have hit it on the head.

We use Cingular but on any of the phones that have Bluetooth activated, they will bleed. Most interference is noticed when the phone gets close to a computer speaker or if you set it too close to the stereo in the trucks.

You are probaly right with your Nextel problem . I just have never seen it cause those symptoms on our desk phones . We have hundreds on Nextel Black/Crack Berry users in our building . Strange , very , Strange . I guess we are just lucky . I did not know .

My first question to them was are they using Nextels as ours(before we cancelled them)would cause interference. However, they are not using Nextels.
The wireless blue tooth headset is suspect. I will ask tomorrow. They are gadget happy and I think this is a clue.

A lot has to do with how close you are to a cell site. All cell phones vary their RF output power and will just put out enough power to hit the nearest site. I have noticed with my Nextel that most times in my office it will cause no problem unless it is within a few inches of the PC speakers. Sometimes though, just sitting at my desk with the phone on my hip will cause noise to be heard from the speakers. I noticed that when this happens the signal level is low and probably the nearest cell site which is a mile or so away is off line.

I also echo the observation that blue tooth enabled devices are prone to this, at least with audio devices and PC speakers.

Unlike Ed I have never seen either of these affect any phone or system though. What system are we talking about here?

-Hal

Comdial DSU-II with analog trunks.

I think that alot of factors come into play here. I cannot believe that it is just a problem isolated to a particular service provider or to a specific tower. I have seen the problem with Cingular phones as well as Nextel. I do not believe it is solely a tower issue, as I have seen the problem at sites that have towers at different distances away. Some towers are a mile and some as many as 10 miles away.

I have two customers at Hartsfield airport. Both are in the same building. One is in suite 210 the other is in suite 255. One has a Nortel CICS,the other an older Panasonic DBS. Both are owned by the same parent company. Both use Nextel cell phones. The Nortel has no problems or complaints.The DBS has alot of issues with bleed over through the sets on the desks. The customer mentions this each time I go on-site. And the answer is always the same, If it only makes the noise when your cell phone is too close to your desk phone or computer then, MOVE THE DAMN CELL PHONE.

I would like to find the answer/solution to this problem too. I have several customers that would be happy to find a way to eliminate it. However, I think the only credible answer will have to come from a Cell engineer. Does anyone here know one they can ask?

So, in that case, it would suggest the newer phone systems has some sort of protection from this interferance. I will find out today about the service provider and headset(bluetooth) issue.

My blackberry causes the same issue. Any time the blackberry is recieving information, it cause clicking sounds in any near by speaker. Changing the phone system will not cure this issue. The solution is to move the blackberrys away from the speaker.

I have Cingular and I know whenever my cell is about to ring by the interference over my computer speakers.

Just a tidbit of info for all- This a Macintosh site and network(lan).

Cingular newer phones have a built in GPS signalling device that will interfere with most all communications devices. My trucks radio, whether on FM or satilite, My computer, both with and without speakers (you should see my screen jumping when I get an incoming call, or when the tower is updating the time), even the Television in my house if I lay my phone too close to it. And mostly on my Inter-Tel phone system in my office. Just something I have learned not to leave my phone too close to something that might amplify the noise.

Some users have bluetooth but never use it, she also mentioned that she does get interferance on her car radio too. I being with Sprint PCS have not had the interferance onto the radio or pc speakers, but I am definetly not waving the Sprint flag. Seems like the only answer would to take another carriers cell phone onsite and see it if still does it??

My cingular acts the same way. My speakers will click and hum while my monitor causes waves to dance around all over. Quite fun to know when your phone is about to ring

They have all the top names for providers for cell phones.

1 - T Mobile
4 - Cingular
1 - Sprint PCS

I hate to say it, but those are three of the four well-known offenders, but now that Sprint and Nextel think they are now one, maybe these are the top three. The problem can't be resolved as long as those carriers' phones are present. I have actually seen a Nextel phone cause a PC to lock up and have to be rebooted multiple times in a row. Think about what these phones are doing next to you head!

She may be out of luck on this, but I have to admit, this is the first complaint of this type in quite some time. I have not experienced this myself wih our Sprint PCS/ Dell Pc scenario. Maybe it is her Mac's.

funny both here in canada we have 3big cell providers wich is bell,rogers and telus bell and rogers are ok but telus the minute your close to a pc radio or any eletronicndevices it chirps
dunno why but we got here too, just like the avian flu

We have had this issue with ALL of the various carriers. I believe DnRComm has the answer though, as the reports are only for phones that have been purchased with the last twelve months.

I am employed by GMAC Mortgage. We have office in all 50 states.

My experience with this problem has been related to GSM phones and Blackberry handhelds only. If the device is within four feet of the desk phone you will have interference. We have had this problem with Nortel Meridian, Avaya Partner & Definity, Comdial, and Panasonic.

We have had this issue with ALL of the various carriers. We tried shielded CAT5 to the phone and computers with no luck. It appears the device (deskphone, computer, ...) is required to not block the signal. Our only recourse here has been to tell the users 'cell phone must be arms length from ..'

just out of cuoriosity, has anyone tried a simple "choke" ( a magnet wrapped around handset/line cord)????

I have no problem having my phone next to my Norstar M7310 or right next to the KSU itself. It causes a slight twitch in the monitor of my computer, but not the tower, wireless keyboard, or wireless mouse.

I've noticed the problem with Toshiba also, using Cingular. A friend of mine is a tech for Cingular, I'll ask him the next time I see him and post his answer here.

Don't no much about celular. But I do know that in each region, carriers use differnt bands of the radio spectrom to provide there service. Maybe the enterference is better or worse depending on what band they are using for the celular service. This is just a thought from a man who don't no much about celular.

Have cell one (or who ever they are now) and experience audio blipping on avaya partner phones when phone is within 2ft of telephone.

PoolFool,
have you ever tried this yourself?
Did it work?
Do you have more details about where I can buy one of these?
Thanks,
Ezra

I am going to drop off a couple chokes to see if that helps. In our scenario(in-house) we have Sprint PCS and a Samsung Idcs 100 and do not get interference