A320
Air Traffic Control Fully Certified
Human-Machine Interface; Situational Awareness; Confusion; Communication Breakdown
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Issued New Clearance
ATC Equipment / Nav Facility / Buildings; Human Factors; Aircraft
I was working an increasingly busier session on RADAR at the Sector 68. The E170 was northwest and level at FL340; requesting FL320 for moderate chop. I descended the E170; switched communications to Sector 67; and lost the Data Block for an A320 in a mess of Data Blocks; who was eastbound level at FL330. When I realized separation was going to be lost; I attempted to turn the A320 away from the E170; but the instructions were not received until the third transmission; for some apparent reason. As the A320 was making the turn I instructed; Sector 67 was turning the E170 away from the A320 at the same time; and separation was regained; but the A320 responded to a RA which instructed them to climb; and separation was lost on the next RADAR hit. Work on my scan; but why would TCAS climb an aircraft into one at a higher altitude?
ZOB Controller described a loss of separation event when failing to note conflicting traffic prior to issuing a descent. The reporter stated the TCAS RA resolution provided compounded the conflict.