000 00270nam a2200121 a 4500
003 EIA
001 8382
942 _02
_2ddc
_cBK
245 _aDigital communications. - 4 ed.
260 _c2001
008 141112s2001 ck r 000 u spa d
082 _a621.382
_bP962
_c4ed
999 _c3301
_d3301