What is the RJ-11 port on the PMP radios used for?

The RJ-11 port has a number of uses.  Most common use is to default the radio when you forget the IP address or password of the radio.  Inserting a default plug and rebooting the radio will bring up the radio with a default of and no password.

The second option is for when you are aligning SM's.  The RJ-11 Port used with a headset will emit a pitch, tone & cadence used to alignt.  The third option is GPS Syncronization.  The AP can be set to receive sync over the power port (RJ45) or the 6 pin port.  The last option is for remote AP's.  See below for details of the Remote AP:

remote ap.JPG