192 topic 4
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Topic 4: Telephone Circuits
Topic 4: Telephone Circuits
Fig 1: Basic Telephone
Topic 4: Telephone Circuits
•Incoming Signaling•Answering, release•Outgoing signaling•Transmitter/ receiver circuits
Topic 4: Telephone Circuits
Fig 2: Incoming signaling circuit
Topic 4: Telephone Circuits
Fig 3: Answering Condition
Topic 4: Telephone Circuits
Fig 4: Outgoing signaling condition
Topic 4: Telephone Circuits
Fig 5: DTMF frequencies and keypad layout
Topic 4: Telephone Circuits
Fig 6: Simplified block diagram of telephone speech circuits