00638nam a22001817a 4500003000400000005001700004008004100021020001800062028000800080082001800088100005700106245008600163260004800249300002700297655003000324655003900354655006300393SNU20140816161006.0140816b        xxu||||| |||| 00| 0 eng d  a9780131963783  aHCL  a001.64404 HAR  aHarper, William L., 1929-aPollard, Robert C., 1930-  aData communications desk bookb: a systems analysis approachc/ William L. Harper  aEnglewood Cliffs, N.J.bPrentice-Hallc1982  a350 p.b: ill.c29 cm.  aData transmission systems  aWilliam L Harper; Robert C Pollard  aData communications desk book: a systems analysis approach