Telephone CIRCUIT DESCRIPTION & Types of Telephone Circuit

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CIRCUIT DESCRIPTION
INCOMING CALL CIRCUIT:
25 C/S ~(AC) from parent exchange on telephone set a wire terminal No.14, terminal No.25, C2 1μF, Bell 1700,ohm, 3-10 or 5-12 loop, terminal No.6 b-wire and back to parent exchange.

SPEECH CIRCUIT:
Speech current from parent exchange transmitter circuit, on telephone set a wire terminal No.14, terminal No.25, nsi/nsr terminal No.26, UI/UII operate terminal No.24, terminal No 2.M transmitter, terminal No.1 w1 4-1k, induction coil 160,ohm 2-1 Tag induced in J winding 38,ohm5-6, receiver point 8-15 Gr. and back to induction coil winding 29 ohms, 1-4 Tag, terminal No.23, 3-10 loop terminal No.6 b-wire and back to parent exchange transmitter.

OUTGOING CALL CIRCUIT:
Pulses from nsi contact, telephone terminal No.26, UI /UII operate terminal No.24, nsa contact operate, terminal No.23, 3-10 loop, terminal no. 6 b-wire, and go to parent exchange.

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