browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z
heartbeat

more about heartbeat

heartbeat


  3  definitions  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  heartbeat 
  n  :  the  rhythmic  contraction  and  expansion  of  the  arteries  with 
  each  beat  of  the  heart;  "he  could  feel  the  beat  of  her 
  heart"  [syn:  {pulse},  {pulsation},  {beat}] 
 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
 
  heartbeat  n.  1.  The  signal  emitted  by  a  Level  2  Ethernet 
  transceiver  at  the  end  of  every  packet  to  show  that  the 
  collision-detection  circuit  is  still  connected.  2.  A  periodic 
  synchronization  signal  used  by  software  or  hardware,  such  as  a  bus 
  clock  or  a  periodic  interrupt.  3.  The  `natural'  oscillation  frequency 
  of  a  computer's  clock  crystal,  before  frequency  division  down  to  the 
  machine's  clock  rate.  4.  A  signal  emitted  at  regular  intervals  by 
  software  to  demonstrate  that  it  is  still  alive.  Sometimes  hardware 
  is  designed  to  reboot  the  machine  if  it  stops  hearing  a  heartbeat. 
  See  also  {breath-of-life  packet}. 
 
 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  heartbeat 
 
  1.    The  signal  emitted  by  a  Level  2  Ethernet 
  transceiver  at  the  end  of  every  {packet}  to  show  that  the 
  collision-detection  circuit  is  still  connected. 
 
  2.  A  periodic  synchronisation  signal  used  by  software  or 
  hardware,  such  as  a  {bus}  clock  or  a  periodic  {interrupt}. 
 
  3.  The  natural"  oscillation  frequency  of  a  computer's  clock 
  crystal,  before  frequency  division  down  to  the  machine's  clock 
  rate. 
 
  4.  A  signal  emitted  at  regular  intervals  by  software  to 
  demonstrate  that  it  is  still  alive.  Sometimes  hardware  is 
  designed  to  reboot  the  machine  if  it  stops  hearing  a 
  heartbeat.  See  also  {breath-of-life  packet},  {watchdog}. 
 
  [{Jargon  File}] 
 
  (1996-03-12) 
 
 




more about heartbeat