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bus

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bus


  4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Bus  \Bus\,  n.  [Abbreviated  from  omnibus.] 
  An  omnibus.  [Colloq.] 
 
  From  WordNet  r  1.6  [wn]: 
 
  bus 
  n  1:  a  vehicle  carrying  many  passengers;  used  for  public 
  transport;  "he  always  rode  the  bus  to  work"  [syn:  {autobus}, 
  {coach},  {charabanc},  {double-decker},  {jitney},  {motorbus}, 
  {motorcoach},  {omnibus}] 
  2:  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}] 
  3:  a  car  that  is  old  and  unreliable;  "the  fenders  had  fallen 
  off  that  old  bus"  [syn:  {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 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  bus 
 
    One  of  the  sets  of  conductors  (wires,  PCB 
  tracks  or  connections  in  an  {integrated  circuit})  connecting 
  the  various  {functional  units}  in  a  computer.  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,  i.e.  the  number  of  parallel 
  connectors,  and  its  {clock  rate}  determine  its  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. 
 
  Some  {networks}  are  implemented  as  a  {bus}  at  the  {physical 
  layer},  e.g.  {Ethernet}  -  a  one-bit  bus  operating  at  10  (or 
  later  100)  {megabits  per  second}. 
 
  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 
  (http://www.foldoc.org/pub/omnibus.html)}. 
 
  (2000-03-20) 
 
 
 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
 
  BUS 
  Broadcast  and  Unknown  Server  (ATM,  LANE) 
 
 




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