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Telephone Networking

Telephone Networking. Basic Circuits. Pictorial of A Simple Electric Circuit. Current Flow. Wire Conductor. -. +. Lamp. Battery. - +. Lamp. V. A Schematic for the Simple Circuit. Hardware Pictorial and Schematic of a Closed Circuit Using a SPST switch for control. Off. On.

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Telephone Networking

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  1. Telephone Networking • Basic Circuits

  2. Pictorial of A Simple Electric Circuit Current Flow Wire Conductor - + Lamp Battery

  3. - + Lamp V A Schematic for the Simple Circuit

  4. Hardware Pictorial and Schematic of a Closed CircuitUsing a SPST switch for control Off On Closed Switch - + V I + - Closed Circuit Path => Current Flows

  5. Hardware Pictorial and Schematic of an Open CircuitUsing a SPST switch for control Off On Open Switch - + V + - Broken Circuit Path => NO Current Flow

  6. Example: Pictorial of a SPDT switch controlling two lamps 1 Lamp 1 2 + Switch - Lamp 2

  7. 1 1 SW SW Lamp 1 Lamp 1 - + 2 2 - + V V Lamp 2 Lamp 2 Example: Schematic of a SPDT switch controlling two lamps

  8. Switch Symbols NOPB NCPB SPDT SPST Single-pole rotary (6-position) DPST DPDT

  9. Typical Mechanical Switches

  10. Construction View of a Typical Toggle Switch

  11. Chassis Ground DC Ground AC Ground Symbols for Ground

  12. -12v I - + 0v Ground Symbol A Simple Circuit Schematic Using Ground Symbols

  13. Schematic Symbols Introduced So Far Ground Resistor Potentio- meter Battery Rheostat Lamp DPST Switch NOPB Switch SPST Switch SPDT Switch NCPB Switch DPDT Switch Ω V Circuit Breaker A Rotary Switch Voltmeter Ohmmeter Ammeter Fuse

  14. Series Circuit R1 R2 R3 V R4 R5 R6

  15. Parallel Circuit R1 R3 R2 V

  16. Series-Parallel Circuit R1 R2 R3 R4 V R5 R6

  17. A node is a connection of a number of circuit components. • A complete node includes all components connected • together electrically Complete Node Partial Node Partial Node Circuit “Nodes”

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