bus
    n 1: a vehicle carrying many passengers; used for public
         transport; "he always rode the bus to work" [syn: bus,
         autobus, coach, charabanc, double-decker, jitney,
         motorbus, motorcoach, omnibus, passenger vehicle]
    2: the topology of a network whose components are connected by a
       busbar [syn: bus topology, bus]
    3: an electrical conductor that makes a common connection
       between several circuits; "the busbar in this computer can
       transmit data either way between any two components of the
       system" [syn: busbar, bus]
    4: a car that is old and unreliable; "the fenders had fallen off
       that old bus" [syn: bus, jalopy, heap]
    v 1: send or move around by bus; "The children were bussed to
         school"
    2: ride in a bus
    3: remove used dishes from the table in restaurants

Bus \Bus\, n. [Abbreviated from omnibus.]
   An omnibus. [Colloq.]
   [1913 Webster] busbar

BUS
       Broadcast and Unknown Server (ATM, LANE)
       

bus
bus topology
computer bus

    A set of electrical conductors
   (wires, PCB tracks or connections in an integrated circuit)
   connecting various "stations", which can be functional units
   in a computer or nodes in a network.  A bus is a
   broadcast channel, meaning that each station receives every
   other station's transmissions and all stations have equal
   access to the bus.

   Various schemes have been invented to solve the problem of
   collisions: multiple stations trying to transmit
   at once, e.g. CSMA/CD, bus master.

   The term is almost certainly derived from the electrical
   engineering term "bus bar" - a substantial, rigid power supply
   conductor to which several connections are made.  This was
   once written "'bus bar" as it was a contraction of "omnibus
   bar" - a connection bar "for all", by analogy with the
   passenger omnibus - a conveyance "for all".

   More on derivation (/pub/misc/omnibus.html).

   There are busses both within the CPU and connecting it to
   external memory and peripheral devices.  The data bus,
   address bus and control signals, despite their names, really
   constitute a single bus since each is useless without the
   others.

   The width of the data bus is usually specified in bits and
   is the number of parallel connectors.  This and the clock
   rate determine the bus's data rate (the number of bytes per
   second which it can carry).  This is one of the factors
   limiting a computer's performance.  Most current
   microprocessors have 32-bit busses both internally and
   externally.  100 or 133 megahertz bus clock rates are
   common.  The bus clock is typically slower than the processor
   clock.

   Some processors have internal busses which are wider than
   their external busses (usually twice the width) since the
   width of the internal bus affects the speed of all operations
   and has less effect on the overall system cost than the width
   of the external bus.

   Various bus designs have been used in the PC, including
   ISA, EISA, Micro Channel, VL-bus and PCI.  Other
   peripheral busses are NuBus, TURBOchannel, VMEbus, MULTIBUS and
   STD bus.

   See also bus network.

   <Ukranian>.

   (2010-07-10)