what are pulsations/beats on analog phone lines ? - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

05-27-2005, 10:36 AM

i hear continual pulsations/beats on some of my recorded analog phone lines. these lines were moved to different ports and the problem went away but then the noise came up on other analog lines. when we listen through a phone set on the frame/block, you can hear the pulses. what could be causing this? how did you resolve it?

**rixride** · 05-27-2005, 11:22 AM

What system do you have? Is it properly grounded?

Spitfire66 · 06-28-2005, 12:59 PM

Yup - could be earth hum - try using a signalling earth if available

PitViper · 07-21-2005, 09:21 PM

Almost sounds like message waiting lamp indications.

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