OPERROR BTWN ACR MLG AND A LIGHT UGA TWIN ENG ACFT. TWIN WAS CLBING TO 12000 FT THE SAME ALT OF THE ACR. TFC HAD BEEN ISSUED TO THE ACR BY THE CTLR AND WAS SIGHTED VISUALLY AND ON TCASII. FLC TOOK EVASIVE ACTION WHEN RA COMMANDED A DSCNT. THE CTLR SAID THEY SHOULD BE CLBING WHICH THEY DID. LTSS.

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WHILE ESTABLISHED ON SNA'S EASTSIDE 1 ARR AND JUST N OF ARCHI; OUR FLT WAS ALLOWED TO BE FLOWN INTO AN UNSAFE SIT RELATING TO A TFC CONFLICT WITH ANOTHER IFR ACFT BY THE SOCAL APCH CTLR WORKING 119.65. THIS OTHER ACFT WAS COMING TOWARDS US AT OUR 1 - 2 O'CLOCK POS AND 500 FT BELOW AND CLBING. OUR TCASII DISPLAYED IT AS A TA. THIS IS WHEN THE SOCAL APCH CTLR GAVE US AN ADVISORY THAT THIS ACFT WAS CLBING TO 12000 FT MSL; OUR ASSIGNED ALT. WE DID SIGHT THIS ACFT COMING TOWARDS US; A LIGHT TWIN; AND OUR TCASII STARTED TO COMMAND A DSCNT WITH ITS RA. WE HAD THE ACFT IN SIGHT AND STARTED OUR DSCNT WHILE TALKING TO SOCAL APCH. THE CTLR FINALLY CAME ALIVE AND EXCITEDLY STATED THAT OUR ACFT'S EQUIP WAS NOT OPERATING PROPERLY AND THAT WE SHOULD BE CLBING. AS THE CTLR WAS TALKING AND THE FO STILL SIGHTING THE TFC; I CLBED TO 12600 FT MSL AT WHICH TIME WE COULD SEE THE TFC PASS BEHIND OUR ACFT WITHIN 1/2 MI. THIS SOCAL CTLR'S LACK OF INPUT; BESIDES THAT OF HIS INITIAL TA; WAS TOTALLY UNSAFE AND UNCALLED FOR GIVEN OUR CTLED ENVIRONMENT OF ALT; AIRSPD AND COURSE WITH THAT OF ANOTHER IFR ACFT'S. THIS FREQ THAT WE WERE ASSIGNED WAS NOT VERY CONGESTED AT ALL AND ALL THAT WE RECEIVED FROM THIS SOCAL CLR WAS HIS BLAME OF OUR TCASII EQUIP WHICH; IN FACT; WAS OPERATING PROPERLY; AND A QUICK FREQ CHANGE SHORTLY THEREAFTER. IN NOTING MY PREVIOUS FLTS INTO THIS AREA; THERE ARE AN INORDINATE AMOUNT OF 'ACCEPTED' CLOSE FLT SEGMENTS. MOST LIKELY; OUR SOCAL CTLR WAS BEING FORCED TO ACCEPT THIS AS A 'NORM' AND; SOMEHOW; LET OUR SIT DEVELOP BECAUSE IT SLIPPED PAST HIM. THIS AREA THAT SOCAL WORKS DOES NEED TO HAVE THEIR ACCEPTED PRACTICES REVIEWED AND ALTERED FOR GREATER FLT SEPARATION AND CLRER TA'S.