CTM THE CTM CITY TIE MODULE IS AN INTERFACE BETWEEN THE CONTROL PANEL NOTIFICATION APPLIANCE CIRCUIT AND A MASTER BOX. IT PROVIDES OFF-PREMISES SIGNAL TRANSMISSION FOR SYSTEMS THAT MUST COMPLY WITH NFPA REQUIREMENTS FOR AUXILIARY PROTECTIVE SYSTEMS. THE CTM ACTIVATES A LOCAL ENERGY FIRE ALARM BOX WHICH PROVIDES A 24V DC ALARM SIGNAL (CURRENT LIMITED AT 200 MA).