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Learn about the history, layout, and functions of the telephone keypad, which has letters and numbers on its buttons. Find out how the letters are used for telephone exchange names, phonewords, and text entry, and how the key tones are produced for dialing and signaling.
Learn about the history and technology of push-button telephones, also known as touch-tone phones, that use dual-tone multi-frequency (DTMF) signaling. Find out how they replaced rotary dial phones and how they evolved into digital and cordless models.
Learn about the history and features of the Trimline telephone, a series of telephones produced by Western Electric from 1965 to 1986. The Trimline was one of the first phones to use a rotary dial in the handset, a lighted dial, and a modular plug and jack.
A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current for telegraphy and telephony. Learn about its history, design, and applications in different types of telephones and switchboards.
A user could select any available telephone line by pressing the appropriate pickup key and taking the handset off-hook. While on a telephone call, a user could place the call on hold by pressing the hold button, which also released the depressed line button mechanically, enabling the user to select another line for placing a call.
The model 500 telephone was the standard domestic desk phone in North America from 1950 to 1984. It had a modular design that allowed various features and colors, and was replaced by the model 2500 with touch-tone service.
DTMF is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. It was developed in the Bell System in the United States and became known under the trademark Touch-Tone for use in push-button telephones.
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