They also like to drill on the arial telephone cables. Water then gets into the cable and causes a partial grounding on the circuits. This causes 60Hz hum to be heard on the line as well as a loss of amplitude. Qwest says tough s--t.
All three of my POTS lines have hum. They are connected to an Adtran 750 and my asterisk system (a testbench for commercial endeavors.)
The hum has always been bad on my end. Since I installed *, several of my callers have remarked about the hum.
So here's the question: Could a notch filter of sorts be installed in the codecs I use? Filter-out everything between, say, 55 and 65Hz?
Alternatively, is there a feature on the Adtran FXO card that deals with this?
Thanks for your help, Mike
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