Telephone noise problem


I have very strange problem, and hope someone out there has an idea how to fix it. I have a 2-line phone, but I get a loud hum on line #2 when I have both lines plugged into the phone. When just line #1 is connected, the signal is very clear. I am pretty sure that the problem is inside, since I've checked each line at the NIC outside, and both are clear. I have replaced the standard twisted pair wiring with cat-5, but that hasn't helped. I thought it was the phone and had that replace, but that didn't fix it, either. Any ideas? Thanks
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unplug the problem phone overnight from phone line and any power adapter and remove its batteries, to discharge any surge problems, and check it the next day. compare it to a known good phone. phone telephone repair and have them test each line. try two single lines at the same problem jack and see if there is crosstalk. check the lines for a high resistance short with a megohm meter. reverse the line pairs. reverse the red/green polarity. reduce the phone to one line use. remove other items on the lines like computer, fax, caller id boxes.
snipped-for-privacy@comcast.net wrote:

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snipped-for-privacy@comcast.net wrote:

You probably once had a "Princess" phone with a lighted dial, and the transformer that ran the light is still connected. Look for a little gray "wall-wart" with a wire running to a phone junction box.
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The first apartment I had had one of those. The phone had been removed but the wall-wart was still there.
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Mark Lloyd
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Bill,
Looks like most of the troubleshooting has been done. The question I have is were both incoming CO lines at the NIC plugged into the phone the same way it was in the house so that the test was a true test duplicating the in-house set up (as opposed to testing the two lines independently)? Normally a jack is wired to the RJ14 standard for two line sets, but I have seen a few phones that put line one on one jack and line two on another so that the phone uses RJ11 instead of an RJ14 set up: http://en.wikipedia.org/wiki/RJ11%2C_RJ14%2C_RJ25
If the lines are good at the NIC and work when plugged into the phone like they were in the house and the problem goes away, then you pretty much have identified the problem as an inside the house problem if the exact same phone was used. New wires installed and pinned out properly and problem is still there? New jack too? If a new wire was installed AND a new jack was installed too (from the NIC or a cross connect point in the house?) and the problem is still there, then it would seem like a phone problem, but the E-mail says new phone was used too.
Does the phone have features that require a plug in power supply? Perhaps the problem is power related at that location. Bad ground issue? Sometimes a hum is caused by the line touching ground somewhere or sometimes a proper ground missing from a business phone system causes an open ground hum.
Will phone work without plug-in power supply, then try with power off.
That's my 2-cents.
Carlos M. Mendoza, Jr. CM Communications Data - Video - Voice - Fiber Optics Office: (716) 831-9799 Fax: (716) 831-7073 Cell: (716) 445-1537 snipped-for-privacy@aol.com
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