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  2. KSU-less system - Wikipedia

    en.wikipedia.org/wiki/KSU-less_system

    A KSU-less telephone system is a type of electronic key telephone system that puts the switching circuitry inside of each individual phone. [1] This eliminates the need for a key service unit (KSU), which in traditional key systems is a centralized cabinet that contains the switching circuitry, and allows phones to be wired together in series while retaining certain advanced key system ...

  3. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features for call handling.

  4. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    List of the mainly electro mechanical switching systems from Hasler AG Bern, which were used in public telephone network in Switzerland for many decades. Hasler AG finally merged into Ascom in 1987. HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and ...

  5. Small office/home office - Wikipedia

    en.wikipedia.org/wiki/Small_office/home_office

    The small office home office has undergone a transformation since its advent as the Internet has enabled anyone working from a home office to compete globally. Technology has made this possible through email, the World-Wide Web, e-commerce, videoconferencing, remote desktop software, VPN, VLAN, webinar systems, and telephone connections by VOIP.

  6. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    Telephone switches are a small component of a large network. A major part, in terms of expense, maintenance, and logistics of the telephone system is outside plant, which is the wiring outside the central office. While many subscribers were served with party-lines in the middle of the 20th century, it was the goal that each subscriber telephone ...

  7. AT&T Merlin - Wikipedia

    en.wikipedia.org/wiki/AT&T_Merlin

    The Merlin system was originally sold in two-line, six-telephone (206); four-line, 10-telephone (410); and eight-line, 20-telephone (820) configurations. Later, there was a further 10-line, 30-telephone configuration, and with the addition of an expansion key service unit (KSU) the system could accommodate up to 30 lines and 70 telephones ...

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