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faint noise on Cat5e phone
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| Topic: | faint noise on Cat5e phone This thread has 16 replies. Displaying posts 1 through 15. |
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| Post 1 made on Monday December 5, 2005 at 08:19 |
ericstac Long Time Member |
Joined:
Posts: | October 2002
312 |
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Is there any type of filter or resister or anything I can add to a service line coming into a house to remove a faint humming noise on the phone line. It is definitely on the service line between the enclosure and the d-marc.
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| Post 2 made on Monday December 5, 2005 at 09:08 |
ceied Loyal Member |
Joined:
Posts: | February 2002
5,754 |
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try moving incoming cat 5 away from the 200/400 amp service coming into house. i bet the electric service might have something to do with your hum
my 2 cents
ed
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Ed will be known as the Tiger Woods of the integration business, followed closely with the renaming of his company to "Hotties A/V". The tag line will be "We like big racks and tight holes"... |
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| Post 3 made on Monday December 5, 2005 at 09:08 |
Wire Nuts Active Member |
Joined:
Posts: | June 2005
611 |
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Relocate the cat5 at least 2' away from incoming telco service. Do you hear it out at the demarc? If you do, have the telco co. come and fix it.
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| OP | Post 4 made on Monday December 5, 2005 at 09:32 |
ericstac Long Time Member |
Joined:
Posts: | October 2002
312 |
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No, the telco line is good, once you connect the service to the can the service line gets some type of noise. Before going out there again I want to give the tech several options. One was hopfully being a filter of some sort.
d-marc is clear..
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| Post 5 made on Monday December 5, 2005 at 09:56 |
Fred Harding Super Member |
Joined:
Posts: | October 2001
3,461 |
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1. Ground unused pairs at one end only
2. Contact Mike Sandman @ mikesandman company, truly a great resource for strange telephone parts. His flow chart for checking for rf noise on telephone is a thing of beauty.
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On the West Coast of Wisconsin |
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| Post 6 made on Monday December 5, 2005 at 09:56 |
ceied Loyal Member |
Joined:
Posts: | February 2002
5,754 |
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ok if its "good " at dmarc then you got a wiring problem in the house. check the cat 5 from dmark to panel that it is not near conduit or romex.. then connect each line one at a time till you find the problem cable then fix it
ed
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Ed will be known as the Tiger Woods of the integration business, followed closely with the renaming of his company to "Hotties A/V". The tag line will be "We like big racks and tight holes"... |
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| OP | Post 7 made on Monday December 5, 2005 at 10:26 |
ericstac Long Time Member |
Joined:
Posts: | October 2002
312 |
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Really guys, We've been through all the basics, most likely it the service line was ran wrong.
Fred, Grounding an unused pair might kill the noise?
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| Post 8 made on Monday December 5, 2005 at 10:39 |
ceied Loyal Member |
Joined:
Posts: | February 2002
5,754 |
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if you knnow what the problem is , why ask? fix it
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Ed will be known as the Tiger Woods of the integration business, followed closely with the renaming of his company to "Hotties A/V". The tag line will be "We like big racks and tight holes"... |
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| Post 9 made on Monday December 5, 2005 at 10:39 |
Fred Harding Super Member |
Joined:
Posts: | October 2001
3,461 |
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It's worked in the past.
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On the West Coast of Wisconsin |
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| Post 10 made on Monday December 5, 2005 at 12:55 |
Ernie Bornn-Gilman Yes, That Ernie! |
Joined:
Posts: | December 2001
30,104 |
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An unused pair is an antenna, and anything going in one end, or the middle, is present on the entire wire. This could (I said COULD) allow capacitive coupling of the unused wire to the used wire to ... I want to say induce, but that has to do with magnetic fields...let me say impress a signal on the used line. I know the used line is of very low impedance, so it should be pretty impervious to noise capacitively coupled into it this way, but as is so often the case
It couldn't hurt.
And if it works, well, then, guess what? It works!
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A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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| Post 11 made on Monday December 5, 2005 at 17:22 |
Larry Fine Loyal Member |
Joined:
Posts: | August 2001
5,002 |
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You might also try substituting another pair in the cable as an experiment. This will separate environment from an accidental connection somewhere.
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| Post 12 made on Monday December 5, 2005 at 20:56 |
Instalz Active Member |
Joined:
Posts: | April 2005
628 |
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Might sound crazy, but run a temp from demarc to panel thru a window or door, see what you get. If it's clean then you know it's the feed from panel to demarc.
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| Post 13 made on Monday December 5, 2005 at 20:59 |
Instalz Active Member |
Joined:
Posts: | April 2005
628 |
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Fred is right. I've used this approach with success before... Don't know why, but don't care either, it worked...
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| Post 14 made on Tuesday December 6, 2005 at 08:19 |
Wire Nuts Active Member |
Joined:
Posts: | June 2005
611 |
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Grounding 1 or 2 pairs acts like a drain or sheild on the wire. Any way to rerun a new feed? Be creative.
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| OP | Post 15 made on Tuesday December 6, 2005 at 08:44 |
ericstac Long Time Member |
Joined:
Posts: | October 2002
312 |
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I can have the tech re-run but it will be a few holes and I would rather not have to deal with that. I can run a test wire through the window to see if that fixes it but i know it will so why do it..
I'm going to have the guy try to ground the unused wires and try a different pair hoping this will fix it..
Does it matter where I ground it? d-marc or enclosure?
For the ground should I just run it into the ground below the d-marc?
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