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  2. PSTN network topology - Wikipedia

    en.wikipedia.org/wiki/PSTN_network_topology

    PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...

  3. Long line (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Long_line_(telecommunications)

    In telecommunications, a long line is a transmission line in a long-distance communications network such as carrier systems, microwave radio relay links, geosynchronous satellite links, underground cables, aerial cables and open wire, and Submarine communications cables.

  4. T/Maker - Wikipedia

    en.wikipedia.org/wiki/T/Maker

    T/Maker took a different approach to most other spreadsheets: instead of embedding formulas in each cell, formulas were defined on a per-row and per-column basis in the margins. [2] Although T/Maker was released six months after VisiCalc, it was perhaps [vague] the first application to provide an 'office' suite approach to data. Tables could be ...

  5. Marker (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Marker_(telecommunications)

    A marker is a type of special purpose control system that was used in electromechanical telephone central office switches. Switches employing markers belong to a class of switches known as " common control ", as the purpose of a marker is to control the closure of contacts in the switching fabric that connect a circuit between the calling party ...

  6. List of spreadsheet software - Wikipedia

    en.wikipedia.org/wiki/List_of_spreadsheet_software

    Kingsoft Office Spreadsheets 2012 – For MS Windows. Both free and paid versions are available. It can handle Microsoft Excel .xls and .xlsx files, and also produce other file formats such as .et, .txt, .csv, .pdf, and .dbf. It supports multiple tabs, VBA macro and PDF converting. [10] Lotus SmartSuite Lotus 123 – for MS Windows. In its MS ...

  7. Driver location sign - Wikipedia

    en.wikipedia.org/wiki/Driver_location_sign

    On motorways distance marker posts also bear an arrow pointing towards the location of the nearest emergency telephone. [4] The number used on distance marker posts is also encoded into the numbers associated with motorway emergency roadside telephones. [5] In this way motorway control centre staff can pinpoint the telephone from which a call ...

  8. FarPoint Spread - Wikipedia

    en.wikipedia.org/wiki/FarPoint_Spread

    FarPoint Spread for Windows Forms is a Microsoft Excel-compatible spreadsheet component for Windows Forms applications developed using Microsoft Visual Studio and the .NET Framework. Developers use it to add grids and spreadsheets to their applications, and to bind them to data sources. [ 5 ]

  9. Digital Multiplex System - Wikipedia

    en.wikipedia.org/wiki/Digital_Multiplex_System

    The DMS-250 is the backbone of a number of carriers' long-distance networks. The DMS-300 is an international gateway switch, and the DMS-500 is commonly deployed by competitive local exchange carriers because it combines DMS-100 and 250 capabilities. DMS switches run a proprietary multitasking operating system known as SOS.