TN420C Tone Detector finds and analyzes tones on the TDM bus (Time Division Multiplexing). This card is equipped with eight channels that provide four Dual Tone Multi-Frequency (DTMF) receiver ports, which gives it two Network Processing Elements (NPEs). Two general purpose tone detector ports and two digital loop-around ports are included as well. The TN420C are replaced by TN2182B and TN744D
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