A RADAR CTLR ALLOWS ANOTHER CTLR TO CLB AN IFR CRP ACFT THROUGH HIS AIRSPACE; BUT FAILS TO POINT OUT A CONFLICTING ACR COMMUTER AT 16000 FT. LOSS OF SEPARATION OCCURRED WHEN THE CRP ACFT CLBS ABOVE 15000 FT.

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I WAS THE RADAR CTLR AT SECTOR 74 IN NEW YORK ARTCC. THERE WAS NO HIGH ALT POS ASSIGNED TO THE SECTOR. SECTOR 74 OWNS 13000-17000 FT. THERE WAS TRAINING AT SECTOR 92. THERE WAS NO HIGH ALT POS ASSIGNED TO THE SECTOR. SECTOR 92 OWNS 9000-12000 FT. SECTOR 75 OWNS FL180 AND ABOVE. THERE WAS A HIGH ALT POS ASSIGNED TO THE SECTOR. EVENT DESCRIPTION: SECTOR 92 CLBED ACFT #1 TO 12000 FT (DEPARTED AVP). SECTOR 92 CALLED ME FOR A POINTOUT IN ORDER TO CLB ACFT #1 TO 17000 FT. I (SECTOR 74) APPROVED THE POINTOUT WITH REF TO TFC AT 15000 FT SEBOUND; BUT FAILING TO REF NBOUND TFC AT 16000 FT (ACR). AFTER CLRING TFC AT 15000 FT; SECTOR 92 CLBED ACFT #1 TO 17000 FT. SECTOR 92 FLASHED ACFT #1 TO SECTOR 75 FOR FURTHER CLB TO FLT LEVELS. SECTOR 75 ACCEPTED HDOF. SECTOR 92 XFERRED COMS OF ACFT #1 TO SECTOR 75. CONFLICT ALERT ACTIVATED WITH TFC AT 16000 FT NBOUND (ACR FLT) THAT I HAD FAILED TO REF ON THE INITIAL APPROVAL OF THE POINTOUT. SECTOR 75 RADAR CTLR STOPPED ACFT #1 AT 15000 FT; BUT TOO LATE FOR ACFT #1 TO STOP THE CLB AND IT CLBED THROUGH 15000 FT BEFORE DSNDING BACK TO IT. OPERROR OCCURRED THE MOMENT ACFT #1 LEFT 15000 FT CLBING. REASON FOR THE LOSS OF STANDARD SEPARATION: SECTOR 74 CTLR (ME) FAILED TO ISSUE TFC AT 16000 FT THAT WAS A FACTOR FOR ACFT #1. I AM AN EXPERIENCED ATC CTLR WITH 18 YRS OF FAA SVC. ALL 18 YRS OF MY CAREER HAVE BEEN AT THE SAME AREA ON ZNY. THIS ERROR OCCURRED A FEW MINS AFTER RELIEVING THE PREVIOUS CTLR. I FEEL THE LIKELIHOOD OF AVERTING THIS MISTAKE WOULD HAVE BEEN MUCH HIGHER HAD I BEEN WORKING THE POS FOR A LONGER PERIOD OF TIME. I FEEL THAT I SHOULD HAVE SPENT MORE TIME OBSERVING THE SECTOR BEFORE TAKING OVER. I DID SPEND APPROX 1-2 MINS IN THIS PROCESS AND OVERALL; I FELT AT THE TIME IT WAS AN ADEQUATE TIME; BUT IN RETROSPECT; CLRLY I COULD HAVE BENEFITED FROM SOME ADDITIONAL TIME TO OBSERVE THE TRACK AND SPD OF THE ACR FLT THAT EVENTUALLY BECAME PART OF THE INCIDENT. RECOMMENDATIONS: MANDATE 5 MIN OBSERVATION PERIODS BEFORE STARTING A RELIEF BRIEFING.