Lucent Avaya Definity TN748B Tone Detector Circuit Card. The Avaya Definity TN748B Tone Detector has 4 DTMF receivers and 2 general-purpose receivers to detect call progress tones, modem answer-back tones, transmission test tones, and noise.
Part Number: TN748B
Specifications:
-4 DTMF Receivers
-2 General-Purpose Receivers
-Detection for Call Progress Tones
-Detection for Modem Answer-Back Tones
-Detection for Transmission Test Tones
-Noise Detection