6
I've been having some issues with my DSL line and when AT&T did a line test they found a lot of noise.
The technician came out and tested the line up to the house and said it was clean. This means that the wire in my house is probably bad or has some interference.
I did all the wiring in my house since we built the house, but I'm not sure how to test the cable for noise.
Is there a tool to test this with? Or how do I determine if there is interference? Should I just run a new cable?
Running a new cable may not help much unless you did something silly. Assuming you used the right type of cable (don't put indoor cable outside in the weather), then the problem is almost always with the termination. Use the correct type of cable, don't bend it beyond the bend radius. Don't use staples to attach it to a wall. Don't run it directly next to power wiring. – Zoredache – 2011-07-26T22:44:18.280
A common mistake I see is UTP run too close to flourescent light fixtures; this goes along with what @Zoredache says about power wiring. Also, large electric motors (refrigerators, A/C units, etc). – Adrien – 2011-07-26T23:06:48.903
Unless you did something stupid like run the cable within inches of a fluorescent light, I'd be surprised if the cable itself is the source of noise. More likely a bad termination is at fault. (One possible problem is getting the pairs crossed in terminating: The wires need to be matched to the pins according to the standard -- simply getting connectivity from one end to the other is not sufficient. In particular, pins 3 and 6 are a pair, and if one simply wires pair/pair/pair/pair left to right two pairs will end up with their wires crossed.) – Daniel R Hicks – 2011-07-27T00:09:15.977