CPR X UNCOORD CLB THROUGH OCCUPIED ALT HAD LTSS FROM CPR Y. SYS ERROR.

Narrative

I WAS WORKING E AND W RADAR POS COMBINED IN ASHEVILLE APCH CTL. RWY 34 WAS IN USE. CPR X HAD DEPARTED AVL; CLBED SEBOUND FOR IRQ VOR; HAD BEEN HANDED OFF TO SHINE SECTOR OF ZTL; CHANGED TO SHINE FREQ; AND HAD LEVELED AT 10000 FT. (DEP PROCS BY LOA: DEPS REQUESTING HIGHER THAN 12000 FT ARE LEVELED AT 10000 FT AND CHANGED TO ZTL AFTER HDOF; AND ATLANTA THEN CLBS THE ACFT.) CPR Y; INBOUND TO GSP; WAS DSNDING SBOUND TO 11000 FT. HAD BEEN HANDED OFF TO ME BY SHINE SECTOR; AND SWITCHED TO MY FREQ. CPR X WAS INDICATING ABOUT 230 KTS AND CPR Y WAS INDICATING ABOUT 400 KTS AS I RECALL FROM MY ARTS IIA SCOPE; CPR Y STILL N OF CPR X AND OVERTAKING HIM. SINCE I WAS NOT SURE WHEN SHINE WOULD CLB CPR X AND SINCE THE ACFT HAD CLOSED TO LESS THAN 8 NM SEPARATION; I DID NOT DSND CPR Y. I ADVISED CPR Y OF THE TFC AND EXPLAINED THAT THE TFC WAS THE REASON FOR THE DELAY IN HIS DSCNT. CPR Y RPTED CPR X IN SIGHT. I ATTEMPTED TO COORDINATE WITH SHINE SECTOR TO TURN CPR Y IN SHINE'S AIRSPACE TO INCREASE SEPARATION FOR DSCNT; OR TO FIND OUT IF I COULD USE VISUAL SEPARATION FROM HIS TFC; BUT THE COORD LINE WAS NOT ANSWERED. I THEN NOTICED CPR X CLB RAPIDLY THROUGH CPR Y ALT; ABOUT A MI LATERAL SEPARATION. I AM NOT SURE WHAT SEPARATION ZTL WAS USING -- I DO NOT BELIEVE THEY CAN USE VISUAL -- OF WHY COORD WAS NOT ACCOMPLISHED. FORTUNATELY MY ACFT; CPR Y HAD CPR X IN SIGHT. GOOD COORD IS ESSENTIAL TO RESOLVE SITS SUCH AS THIS ONE. I REALIZE THAT ZTL CAN BE QUITE BUSY WITH CLT TFC; BUT WE MUST BE ABLE TO COORDINATE THESE OTHER SITS ALSO.