00286nam a2200109 a 450000500170000002000150001708200230003210000230005524500520007826000240013030000220015420251203091849.0  a8172241917  a001.64404,bD, mil  aMiller, Michael A.  aIntroduction to digital and data communications  aBombaybJaicoc1993  axviii, 436p, 24cm