Found on the UBNT Forum: https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=Q0n68V3nVE3QM6rWjHB44g%3D%3D&fcc_id=SWX-R5ACPRISM
There is a third connector and a LED for GPS.
Found on the UBNT Forum: https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=Q0n68V3nVE3QM6rWjHB44g%3D%3D&fcc_id=SWX-R5ACPRISM
There is a third connector and a LED for GPS.