B757-200
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 24
Situational Awareness; Training / Qualification
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance
Human Factors
Loss of separation occurred between Aircraft X and Aircraft Y. Controller Pilot Data Link Communications (CPDLC) testing had just begun. This was my first time using it. I uplinked a climb message to Aircraft X to climb to FL300 and handed him off to the R21 Controller leaving FL195 climbing to FL300. The R21 Controller did catch that Aircraft X was climbing to FL300. Aircraft Y was being worked by R21 Controller descending to FL240. The R21 [Controller] realized Aircraft X was climbing to FL300 after the aircraft had been handed off and switched to the R27 Controller. The R21 Controller then stopped [Aircraft X] at FL250 and turned the aircraft and called traffic. Separation was lost. Aircraft X should have been climbed to FL230 by me.
ZME Enroute Controller reported a loss of separation occurred between two transport aircraft. CPDLC testing was cited as contributing to the error.