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  2. Plessey System 250 - Wikipedia

    en.wikipedia.org/wiki/Plessey_System_250

    [3] Instructions that access memory have an opcode, a field specifying a data register operand, a field specifying a data register used as an index register containing an offset into a segment, a field specifying a capability register referring to the segment containing the memory location, and a field containing a base offset into the segment ...

  3. Radio teleswitch - Wikipedia

    en.wikipedia.org/wiki/Radio_teleswitch

    The use of dynamic switching instead of a fixed timer allows some additional demand management, such as by flexing start and finish times for electric heating loads according to prevailing overall demand levels. Some suppliers also offer more sophisticated heating control using the radio teleswitch network.

  4. Traffic light control and coordination - Wikipedia

    en.wikipedia.org/wiki/Traffic_light_control_and...

    In Australia and New Zealand, the terminology is different. A "phase" is a period of time during which a set of traffic movements receive a green signal - equivalent to the concept of a "stage" in UK and US. One electrical output from the traffic signal controller is called a "signal group" - similar to the UK and US concept of "phase".

  5. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall ...

  6. Staircase timer - Wikipedia

    en.wikipedia.org/wiki/Staircase_timer

    Typical UK pneumatic delay pushbutton switch. A staircase timer is an electrical switch used to control lighting on a staircase, corridor or lobby. A single action turns on the lights and they remain on for long enough to ascend or descend the stairs. The lights then turn themselves off automatically.

  7. Pencil detonator - Wikipedia

    en.wikipedia.org/wiki/Pencil_detonator

    A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil , hence the name. They were introduced during World War II and developed at Aston House , Hertfordshire , UK .

  8. UK railway signalling - Wikipedia

    en.wikipedia.org/wiki/UK_railway_signalling

    In the UK, every section of railway line has a maximum speed, known as the Permissible speed. [20] Table A of the Network Rail Sectional Appendix provides a list of these. Where there is a change in permissible speed on a line, a permissible speed indicator sign will show the new speed.

  9. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    The segment is retransmitted if the timer expires, with a new timeout threshold of twice the previous value, resulting in exponential backoff behavior. Typically, the initial timer value is smoothed RTT + max ( G , 4 × RTT variation ) {\displaystyle {\text{smoothed RTT}}+\max(G,4\times {\text{RTT variation}})} , where G {\displaystyle G} is ...