LESS THAN STANDARD SEPARATION BETWEEN 2 ACR ACFT. PLT DEVIATION ALT EXCURSION.

Narrative

ON A RADAR VECTOR FROM FRIANT WE XED THE LAX 24/25 PROFILE DSCNT R 10 MI INSIDE AVENAL ON A SPD RESTRICTION; AND SWITCHED FROM OAK TO LA CENTER. CENTER TURNED US BACK ONTO THE PROFILE R AND CLRED US TO FL 240 PLT'S DISCRETION OUT OF FL280; AND CALLED OUT MLG ACR Y SW OF US SEVERAL MI (CENTER CHIEF LATER TOLD US HE WAS ON A DIFFERENT FREQ AND DIFFERENT CTLR). AFTER LEVEL FL280; WE WERE TOLD BY CENTER; 'CLRED LOS ANGELES 24/25 PROFILE DSCNT EXCEPT CROSS FILLMORE AT OR ABOVE FL180;' (NO REASON WAS GIVEN FOR THIS RESTRICTION). I DSNDED TO FL180 AND MY F/O WAS HANDLING THE RADIOS. THIS WAS THE LAST DAY OF A 4 DAY ROTATION. WE HAD GOOD RAPPORT. VIS EXCEEDED 100 MI. AFTER A COUPLE MORE REFERENCES TO ACR Y WERE ACKNOWLEDGED; THE F/O SAW IT DISAPPEAR WELL BELOW AND BEHIND US; RIGHT TO LEFT; AS WE APCHED FILLMORE. I NEVER SAW IT COME OUT ON THE LEFT SIDE BECAUSE WE ARRIVED OVER FILLMORE AND I BANKED TO THE RIGHT FOR SADDE. JUST PRIOR TO FILLMORE; I HEARD CENTER SAY; 'RESUME PROFILE DSCNT;' SO AT MY LEISURE I BEGAN A SLOW DSCNT AND; RAPIDLY APCHING TO FILLMORE VOR CONE OF CONFUSION; STARTED A TURN TOWARD SADDE TO INTERCEPT THE R OUTBND FROM FILLMORE. THE F/O; HOWEVER; HAD HEARD CENTER SAY 'RESUME NORMAL SPD;' (LATER CORROBORATED BY THE ACTING CENTER CHIEF) BUT DID NOT NOTICE MY SLOW DSCNT BECAUSE HE WAS HEADS UP LOOKING FOR VFR TFC. AT 17600'; CENTER SAID (IN A NORMAL VOICE); 'CROSS FILLMORE AT OR ABOVE FL180.' BUT; STATION PASSAGE TOOK PLACE BEFORE I COULD REACT LOGICALLY. I LEVELED THEN; CONTINUED THE SLOW DSCNT UNTIL ON THE R; THEN COMPLETED THE PROFILE DSCNT. 2 TELECONS WITH THE ACTING CENTER CHIEF REVEALED THAT HE HELD ME RESPONSIBLE FOR A CENTER ALARM; ETC. HIS CTLR'S WERE SITTING SIDE BY SIDE WITH ANOTHER CTLR STANDING BTWN THEM. HE SAID HIS ACR Y CTLR HAD POINTED HIS ACFT AT A LOW ALT CHART FIX 10 MI NW OF FILLMORE ON THE PROFILE R AT 17000'. I FEEL BOTH ACFT SHOULD HAVE BEEN ON THE SAME FREQ OR AT LEAST USING THE SAME CTLR! SUPPLEMENTAL INFO FROM ACN 84423: CONTINUING ON TO LAX; WE WERE GIVEN A PHONE NUMBER ENRTE AND WERE ASKED TO CALL CENTER UPON ARR LAX. CO-PLT PHONED CENTER TO FIND OUT A CENTER ALARM HAD GONE OFF WHEN WE WERE PASSING OVERHEAD FILLMORE.