ACR Y CLB THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. TCASII LOGIC. TCASII INDUCED LTSS. SYS ERROR.

Narrative

ACR X WAS AN OVERFLT AT FL260. ACR Y WAS A DEN DEP SEBOUND. X WAS NWBOUND. Y WAS ISSUED A CLB CLRNC TO FL270. THE CONFLICT ALERT ACTIVATED BRINGING THE CONFLICTION TO MY ATTN. I DETERMINED THAT THE BEST COURSE OF ACTION WAS TO CONTINUE THE CLB ON Y AND DSND X TO FL240. I DSNDED X TO FL240 AND TOLD TO EXPEDITE. I TOLD Y TO EXPEDITE HIS CLB AND FLY HDG 180 DEGS. I RECEIVED NO RESPONSE. I LATER REALIZED THAT Y WAS EXECUTING A TCASII RA AND HAD STARTED A DSCNT. I WAS NOT ADVISED OF THE RA. NOW Y AND X ARE BOTH IN A DSCNT MODE. THE TCASII RA WAS IN DIRECT CONFLICT WITH MY INTENTIONS TO SEPARATE THE 2 ACFT. I BELIEVE; BECAUSE THE TCASII RA WAS UNKNOWN TO ME; THAT I WAS NOT ABLE TO MAKE A CORRECT JUDGEMENT AND DECISION ON HOW TO SEPARATE THE 2 ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED ACR X WAS B757 AND ACR Y WAS A320. ACR Y SAID HE WAS CONTINUING CLB AFTER RA. THIS WAS DISCOVERED LATER FROM TAPES. ACR X; WHEN ISSUED DSCNT; SAID HE WAS RECEIVING AN RA CLB. RPTR SAID 'I UNDERSTAND.' ACR X COMPLIED WITH DSCNT CLRNC; IGNORING RA. REGIONAL OFFICE TOLD FACILITY TO PROCESS AS AN OPERROR; NOT TCASII INCIDENT.