1 Reply Latest reply on Apr 13, 2016 11:21 AM by jayh

    POTS hand-off to PBX

    jallen2020 New Member

      Adtran n00b here.  Will be using an Adtran to hand off from a SIP trunk to POTS on a PBX.  From my experience with other hardware manufacturers, this needs to be done with an FXO port, but from what i can tell, the Adtran TA 900's cant do more than a couple FXO lines (I think I saw the 924 can do up to 8 FXOs).  If i need to hand off, say 16 POTS to a PBX, what Adtran device can I use to get 16 FXO ports on? or will FXS ports work?

        • Re: POTS hand-off to PBX
          jayh Hall_of_Fame

          FXS is what you want. It acts like a phone line. FXO is what is on the PBX for CO lines. It acts like a phone. You should be fine.


          FXS on Adtran:

          Provides battery

          Provides dialtone

          Provides ringing

          Expects loop closure (or ground-start)

          Expects DTMF


          FXO on PBX:

          Expects battery

          Expects dialtone

          Expects ringing

          Provides loop closure (or ground-start)

          Provides DTMF


          When dealing with analog lines, it's important that the Adtran and the PBX be connected to earth ground, preferably at the same point.