B737 DEPARTED PHX BEHIND AN AIRBUS ON A SIMILAR DEP TRACK THAT REQUIRED EVASIVE ACTION BE TAKEN WHILE CLBING THROUGH 11000 FT.

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DEPARTED PHX RWY 7L BEHIND ACR Y AIRBUS. HE WAS ON THE BUCKEYE; WE WERE ON THE MOBIE 1 DEP. NO VISUAL HAD BEEN ISSUED BY TWR TO WATCH THE ACR Y AIRBUS; BUT WE WERE APPROX 5 MI BEHIND HIM ON THE CLBOUT WHILE EBOUND BEFORE THE 190 DEGS TURN AT 4 DME. WE TURNED AS REQUIRED BY THE SID AND WERE ISSUED A CLRNC TO FL210 AND TURNED TO A HEADING OF 190 DEGS. CLBING THROUGH 10000 FT; I NOTICED THE AIRBUS MOVING L TO R IN FRONT OF US; AS HE WAS NOW WBOUND TO BXK. I CALLED DEP TO ASK WHAT HE WAS DOING THERE AS WE WERE HEADED TOWARDS HIM. ABOUT THAT TIME THE TCASII/RA WENT OFF AND WE EXECUTED A L DSNDING TURN TO AVOID FURTHER CONTACT. WE ADVISED ATC WE WERE RESPONDING TO A TCASII ALERT. THE AIRBUS PLTS THEN ASKED ATC WHAT THE TCASII ALERT WAS ABOUT. THE CTLR TOLD THEM IT WAS US; BUT THAT WE HAD VISUAL ON THEM. THE CTLR FURTHER ASKED IF THE TWR HAD ASKED US TO MAINTAIN VISUAL ON ACR Y. WE TOLD HIM NO. I CONTACTED THE ATC MGR TO DISCUSS THE INCIDENT. SUPPLEMENTAL INFO FROM ACN 577418: I WAS FLYING (COPLT) AND THE CAPT WAS WATCHING THE ACFT AHEAD OF US. I CAN'T MAKE AN ASSESSMENT ON WHAT COULD BE CHANGED BECAUSE I DON'T KNOW WHAT THE CLRNC FOR THE AIRBUS WAS AND THE SEPARATION ON THE AIRBUS WAS MAINTAINED VISUALLY AT ALL TIMES BY US.