DK40i CPU
Description
K4RCU3, K5RCU and K5RCU2 DTMF Receiver/ABR Tone Detector Unit System: DK40i Base KSU Circuits per PCB: K4RCU3: four DTMF receivers and four ABR busy tone detectors K5RCU, K5RCU2: five DTMF receivers and five ABR busy tone detectors. Interfaces with:
