switchhook การใช้

A telephone exchange automatically senses an off-hook condition of the telephone when the user removes the handset from the switchhook or cradle.
When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery.
Not only did they not reliably hold down the tiny micro-switch, which now served as the switchhook, but users did not like the feel of them.
The housing sat on top of the base, secured with screws, and contained the rotary dial and the switchhook, which was activated by two plungers in the handset cradle.
When the called party picks up the handset, they actuate a double-circuit switchhook ( not shown ) which may simultaneously disconnects the alerting device and connects the audio circuitry to the line.