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  2. Cordless telephone - Wikipedia

    en.wikipedia.org/wiki/Cordless_telephone

    The FCC only allows DSS model phones to transmit at the full power of 1 watt, which allows increased range over older analog and digital models. [ 14 ] Virtually all new cordless phones sold in the US use DECT 6.0 on the 1.9 GHz band, though legacy phones can remain in use on the older 900 MHz, 2.4 GHz and 5.8 GHz bands.

  3. Answering machine - Wikipedia

    en.wikipedia.org/wiki/Answering_machine

    A Panasonic answering machine with a dual compact cassette tape drive to record and replay messages. An answering machine, answerphone, or message machine, also known as telephone messaging machine (or TAM) in the UK and some Commonwealth countries, ansaphone or ansafone (from a trade name), or telephone answering device (TAD), is used for answering telephone calls and recording callers' messages.

  4. Telecommunications device for the deaf - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_device...

    The entire configuration of teleprinter machine, acoustic coupler, and telephone set became known as the TTY. Weitbrecht invented the acoustic coupler modem in 1964. The actual mechanism for TTY communications was accomplished electro-mechanically through frequency-shift keying (FSK) allowing only half-duplex communication, where only one ...

  5. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    An old rotary dial telephone AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly.

  6. Candlestick telephone - Wikipedia

    en.wikipedia.org/wiki/Candlestick_telephone

    The first tube shaft candlestick telephone was the Western Electric #20B Desk Phone patented in 1904. [1] In the 1920s and 1930s, telephone technology shifted to the design of more efficient desktop telephones that featured a handset with receiver and transmitter elements in one unit, making the use of a telephone more convenient.

  7. On- and off-hook - Wikipedia

    en.wikipedia.org/wiki/On-_and_Off-hook

    On hook telephone handset. The term on-hook has the following meanings: . The condition that exists when a telephone or other user instrument is not in use, i.e., when idle waiting for a call.

  8. Switchboard operator - Wikipedia

    en.wikipedia.org/wiki/Switchboard_operator

    In the early days of telephony, companies used manual telephone switchboards, and switchboard operators connected calls by inserting a pair of phone plugs into the appropriate jacks. They were gradually phased out and replaced by automated systems, first those allowing direct dialing within a local area, then for long-distance and international ...

  9. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    The Call Director model telephone had over 30 line key positions, and used 100 pairs on four connectors. The keyset cables were typically routed to a wiring closet or wiring panel where the Key Service Unit (KSU) was installed and were terminated on a 66 type punch block, typically a model 66M1-50. Each of these blocks could accept two 25-pair ...