00546nam a2200193 a 450000500170000002000150001708200170003210000210004924500480007025000120011826000400013030000230017069000240019369000190021796400190023699700180025599900170027395200620029020251203091745.0  a8120309251  a005.758bBLA  aBlack, Uyless D.  aData communication and distributed networks  a3rd ed.  aDelhibPrentice Hall of Indiac1995  axvi, 426p.c24 cm.  aData communications  aNetwork system  bENGcdefg_  a81642 LIBSC C  c51637d51637  00104070aPUbPUd1998-04-08l0o005.758 BLAp81642yBK