A320 TCAS Displays Traffics on Ground With System OFF

[FishairbusA320]

Hi Everyone!
Today I have experiencied on an A321 NX that TCAS still Displays Traffics on ND With the selector Switched to OFF and XPDR to OFF, i tried yo find some info about this on airbus manuals but no ine has info about this, anybody have any idea about this? Thanks for your help!

[leffsu]

That is the function of Airborne Traffic Situation Awareness{ATSAW).
If your ADS-B out works normally, TCAS computer will receive the traffic info from ATC station or other aircraft.
You can turn it off on the MCDU-MENU-TRAF-
For more info refer to FCOM-DSC-34-SURV-20-ATSAW