00472    a2200157   4500020001500000040002400015082001000039100002400049245005900073246003500132250001200167260004900179300003300228650003100261650002200292  a0130843709  aLibrary of Congress00a004.61 aStallings, William.10aData and computer communications /cWilliam Stallings.14aData & computer communications  a6th ed.  aNew Delhi :bPrentice-Hall of India,cc2000.  axx, 810 p. :bill. ;c25 cm. 0aData transmission systems. 0aComputer networks