existing 3 amp circuit breaker labeled NO. 2 XPDR. This circuit breaker also supplies power to the 28VDC IN NO 2 pin of the CTI.-92E control unit. CTL-92E Transponder Control Unit The transponders) TDR-94D(s) are controlled by a single Rockwell Collins CTL-92E Transponder Control Unit. When a single TDR-94D is installed, the