We are experiencing a constant humming sound coming from the over head paging speakers. We are using FXO ports on our Cisco Callmanager 9.x and paging does work when the paging number is dialed. Why would we hear a constant hum
Maybe the paging system requires a different input than an FXO port?
If you unplug the FXO does the humming go away?
What exactly are you connecting the FXO port to?
Unplugging the FXO port does not make the humming go away. We have the FXO port plugged into a TAMB2 unit and then from there it goes to our punch down blocks and wired up from there.
Ok so the issue is with your paging system and nothing to do with the FXO port.
Fix that before trying to connect to the TAMB and the fxo port. Humming usually means power is running through the audio leads, a wiring issue
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