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Topic 4: Telephone Circuits

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Page 1: 192 Topic 4

Topic 4: Telephone Circuits

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Topic 4: Telephone Circuits

Fig 1: Basic Telephone

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Topic 4: Telephone Circuits

•Incoming Signaling•Answering, release•Outgoing signaling•Transmitter/ receiver circuits

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Topic 4: Telephone Circuits

Fig 2: Incoming signaling circuit

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Topic 4: Telephone Circuits

Fig 3: Answering Condition

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Topic 4: Telephone Circuits

Fig 4: Outgoing signaling condition

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Topic 4: Telephone Circuits

Fig 5: DTMF frequencies and keypad layout

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Topic 4: Telephone Circuits

Fig 6: Simplified block diagram of telephone speech circuits