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Telephone line noise when computer is online

Phone co. advised switching cable from entry termial to computer to Cat 5 cable and that did not help.

Our phones are all cordless with a central receiver serving 5 base units and phones scattered all over the house. How do I filter the computer noise out of the phone line @ the splittter about three feet from the computer?

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Hi and welcome to FixYa,

Initially, the telephone line where the DSL line is also piggybacked should have a filter similar to the one shown below.
telephone line noise when computer is online - 4f97a04.jpg
Should one already be installed, pls try to replace it and consult your telephone/ISP provider for a version that would allow grounding to earth.

An alternate possibility is that the PSU/SMPS (switch mode power supply) of the computer is producing RFI (radio frequency interference) and is affecting the cordless telephones radio connection. Of course if your router is also a WiFi AP (wireless) operating on 2.4 GHz, then it would affect your wireless phone if they too are operating on 2.4 GHz. Unfortunately, the solution is to switch wireless phones to 5.8GHz versions.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 25, 2008

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Check that the cord is at least 2 feet (0.6 meters) away from other power cords, speaker wires, and other electronics.

Posted on Dec 25, 2008

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Move the splitter furter away from the phone set and computer.its causeing interference

Posted on Dec 25, 2008

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Whoever your phone company or ISP is should have given you a Line Filter for each phone. It is a device that you plug your phone line into and then the Line Filter into the wall. Its purpose is to reduce line noise when using cable for the Internet. They are small devices you can put anywhere without it being noticed. This is standard equipment when using cable I'm surprised no one offered it. Let me know how it turns out.

Posted on Dec 25, 2008

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Ilter circuitry for filtering noise from a pair of telephone conductors connected to a modem or a facsimile transmission unit includes a capacitor in series with a fixed resistor. A vaariable resistor is connected in series with the capacitor and the fixed resistor. The capacitor is non-polarized. A switch is connected in series with the filter elements for selectively connecting and disconnecting the filter from the telephone conductors

Posted on Dec 25, 2008

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What jack does the Slingbox Ethernet cable hook into on a ATT 2wire modem? I have a choice of DSL or one like the phones are hooked into. It's not working now so I'm backing up each step, no matter...


Before you change anything - is this a new device you are hooking up or had this thing worked in the past? First thing to do is reboot everything starting with the modem and ending with the computer at the end of the line. Wait at least 30 seconds between each device. Review all the connections - everything plugged in where it should be? (this is of course your question - see more below).

Eithernet connections (plugs) are RJ-45. The RJ-45 looks like a RJ-11 (telephone jack) only bigger. Typically, the RJ-45 will not fit into the RJ-11 AND SHOULD NOT. Why? Your Cat 5 eithernet runs on very low voltage and signal (packet switching). If you succedssfully get the RJ-45 CAT 5 cable into the RJ-11 phone jack, when the phone rings, you will be sending 60 volts into your network. Can you spell "Do I smell smoke?" A RJ-11 will have up to 6 wires (one pair or two pair or three pair) in the jack and up to 6 'buds' on the RJ-11 plug. A RJ-45 will have 8 wires (in the jack) and 8 'buds' on the plug of your cat 5.

Your device may say DSL on the Cat 5 connection - count the wires inside or the jack.

There are other Cat 5 connection types, punch down and terminal screw types, I dont think you are talking about either.

On your AT&T modem, you should find a RJ-11 which will attach to a near by telephone jack and a RJ-45 for your Cat 5 cable. Your modem may also serve as a router and as such would have additional RJ-45 ports. I suspect you are using a separate router for your home network. As such, one of the ports on the router should be marked Internet or Upload or maybe it is a special color or is set aside from the other ports. That special port will be connected to your modem and your other computers will use the other, lesser ports.

Of course, you could call your service provider for clarification also.

Thank you for your question @ FixYa.com - I am sorry you are having this trouble and I hope I have helped you in some way. I hope you are able to get your system back up in short order.

If you are pleased with this response, please consider awarding the coveted 4 thumbs up to this response. Thank you

Aug 08, 2011 | 2wire Computers & Internet

1 Answer

I have an HP 2510 printer. I cannot use it to fax because once I plug the phone jack into the printer I get a busy signal. If I plug the jack into a phone, it works fine. How do I get the printer to...


Hi irwinbadin,

HP fax products are designed so that other telephone equipment can be connected on the same line as the fax. The unit must be connected first using a two-conductor fax/phone cable like the one that shipped with the HP product. Using a four-conductor telephone cable may cause problems receiving faxes or calls.

There are two different types of phone cables. There are two-conductor phone cables like what originally shipped with the HP fax product and there are four-conductor cables. HP fax products are designed to work with a two-conductor phone cable. Look at the end of the cable and verify that it has only two copper leads or wires. Replace any four-conductor cables with a two-conductor cable. Only two-conductor phone cables should be used to connect the all-in-one to the phone line.

Figure 1: The difference between a two-conductor phone cable and a four-conductor phone cable
reyjoshua07_5.jpg


Step one: Connect the phone line to the fax
The fax will have two or three sockets (or jacks) for phone lines. Some of these may have a removable plastic plug in them. These sockets will be labeled with text, To Wall Jack , or with a graphic of the wall jack. See Figure 1 below.

Plug the two-conductor telephone cable that came with the HP product into the telephone wall jack. Then, plug it into this socket as shown below.

reyjoshua07_6.jpg


In areas with above ground telephone lines and electrical storms (lightning), it is a good idea to purchase a telephone line surge suppressor and connect it between the telephone wall jack and the fax. This will help prevent damage to the fax from a lightning-caused power surge on the phone line.

Step two: Add other phone-line devices
To connect other telephone devices, use the other socket (or sockets) on the fax. These are identified by text or with a graphic of a telephone and/or computer.

Connect a caller ID unit between the fax and the telephone.
Use the information below that matches the devices you need to connect.

Fax and telephone
Connect a single-line telephone to one of the added sockets on the fax. The telephone will share the same phone line as the fax. See the illustration below.

reyjoshua07_7.jpg


Fax, answering machine, and telephone
When a telephone answering machine and telephone are connected, connect the answering machine to the fax and then connect the telephone to the answering machine as shown below.

reyjoshua07_8.jpg


Fax and computer modem
To use a fax and a computer modem on the same phone line, connect the fax to the computer modem. The modem socket on the computer may be labeled Line or Wall jack .

reyjoshua07_9.jpg


Fax, computer modem, and telephone
To use a computer modem and a telephone with the fax, connect the computer modem to the fax. Then, connect the telephone into the second phone line connector on the computer modem or the third fax socket (if it is available). The image below shows how to connect a computer and a telephone to a fax with two sockets.

reyjoshua07_10.jpg


Fax, modem, answering machine, and telephone
The image below shows how to connect a computer modem, answering machine, and telephone to a fax. Connect the computer modem to the fax, then connect the answering machine to the computer, and finally, connect the telephone to the answering machine.
If the fax has three phone line sockets instead of two, some of the devices can be connected to the other phone socket on the fax.

reyjoshua07_11.jpg


Hope it helps.

Thank you for using FixYa.

Jun 27, 2011 | Office Equipment & Supplies

1 Answer

I have a sony duel like cordless phone SP 511. Now it is emiting noise when receiving any call or making any call. The noise is like the line is getting earthed somewhere. The parrel connection is perfect....


Answer: Telephone line noise is usually caused eitherby an attached telephone or by the telephone line acting as an antennaand picking up radio frequency interference. If you have checked all ofthe telephones and telephone line devices and the noise problem occurson all outlets and all telephones (or at least all telephones without abuilt-in filter), then we recommend one of the noise problem solverslisted below. These work by removing the unwanted frequencies. If youhave tried both a filter and a choke core without results, then theproblem may be a physical problem with the phone line wiring iteself.In this case, you would need to contact your telephone company to havethem check the wiring. It doesn't solve the problem but will give you a hand to solve it.Hope it helps.

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Is this EVERY time? If its a land line, depending on where you live and who the phone co. is , the prob may be in the phone co. central office (CO) switch which is where your dial tone comes from. Its the place where all dial tone is generated for your area generally a 5 - 10 mile radious. Outside of that radious is another CO and so on & so on. well sometimes depending on the type of switch the CO is using it can get bogged down with too many people making calls at one time. and that message will come up until less callers are on at 1 time. Your cordless phone or any phone you have can never make that message happen. I am a technician for the phone co. in my area for the past 11 years so I have a little knowledge on the subject. Sometime phone company customer service reps will tell you anything to get you off the the phone just to make their call quota look good. eventually you'll get someone who cares about your issue and will get a tech out there to help you. hope this helps.

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