ACR MLG ALTDEV OVERSHOT DURING CLB OUT FROM OAK. TCASII INDICATED TA BUT TFC WAS SIGHTED AND REMAINED OVER 5 NM AWAY AT SAME ALT.

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AFTER DEP FROM OAK FOR SAN; INITIAL CLRNC WAS TO 2000 FT. PRIOR TO LEVELING AT 2000 FT; CLRNC WAS RECEIVED TO 10000 FT. FO (PNF) SET 10000 FT IN ALT ALERT; BUT SOMEHOW IN THE FOLLOWING 2-3 MINS; 11000 FT APPEARED IN WINDOW. WE CONTINUED OUR CLB THROUGH 10000 FT AFTER HEARING 1000 FT ALERT. AT APPROX 10500 FT; THE CTLR (IN A NORMAL VOICE) NOTIFIED US THAT THERE WAS INBOUND TFC AT 2 O'CLOCK AT 11000 FT. I LOOKED AT THE ALT ALERT SETTING (11000 FT) AND WAS SUBCONSCIOUSLY WONDERING WHY WE WOULD HAVE BEEN CLRED TO THE CONFLICTING ALT. THE TCASII WAS SET ON 10 MI RANGE; AND THE TFC CONFLICT WAS AT APPROX 6 MI. THE RA PORTION INDICATED 'MONITOR VERT SPD.' WE LEVELED AT 11000 FT (THE FO SINCERELY BELIEVED THAT WAS THE ALT CLRED TO); THE CTLR CALLED TO ASK OUR ALT AND THE TFC PASSED WELL CLR AT 6 O'CLOCK AT 5 MI. I THINK A DIFFERENT TCASII DESIGN WOULD HELP HERE. OUR TCASII SCREEN PRESENTED A POTENTIAL CONFLICTS WITH AN ALT DIFFERENCE. THAT INFO IS HARDER TO MENTALLY TRACK THAN IT WOULD BE IF I COULD CONTINUALLY SEE HIS ACTUAL ALT; SINCE THAT WOULD HAVE BEEN A CONSTANT IN THIS CASE. NOTING THAT THE ALT IN MY ALERTER (11000 FT) WAS THE SAME AS HIS ON THE TCASII SCREEN AT 8-9000 FT WOULD HAVE ALERTED ME TO QUESTION MY CLRNC. SUPPLEMENTAL INFO FROM ACN 192639. I THOUGHT I DIALED IN 10000 FT ON THE AUTOPLT; BUT I EITHER MISTAKENLY DIALED IN 11000 FT OR THE AUTOPLT CTLR CHANGED. IT WAS THE OLDER SYS (EVERY CLICK IS 1000 FT; NOT LIKE THE NEWER ONE OF 100 FT) AND OCCASIONALLY IT HAPPENS.