Operator Panel
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ROTARY
DIAL
DIAL
Click a number. The dial sweeps to the finger stop, then returns and sends decadic pulses.
Pick up a subscriber, then pulse dial.
Idle
Operating
Held
Waiting/ringing
Busy/fail
Pulsing/TG
Relay Key
LR - Line Relay
CO - Cut-Off Relay
SR - Start/Seize Relay
IR - Impulse Relay
TR - Trunk Relay Set
IS - Incoming Selector
BR - Busy Relay
RR - Ring Relay
TG - Tone Generator
LR - Line Relay
CO - Cut-Off Relay
SR - Start/Seize Relay
IR - Impulse Relay
TR - Trunk Relay Set
IS - Incoming Selector
BR - Busy Relay
RR - Ring Relay
TG - Tone Generator
Detailed Exchange Mechanism View
Exchange Log