chap4 - ___________________________________________Ch ng 4...

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Unformatted text preview: ___________________________________________Ch ng 4 Truy n n i ti p b t ng b IV - 1 CH NG 4 TRUY N N I TI P B T NG B H TH NG TRUY N D LI U V n hnh Dung l ng knh truy n M U TN HI U TRONG TRUY N B T NG B VI IC TH C HI N GIAO TH C B T NG B 6402 c a INTERSIL 6850 c a MOTOROLA 8251 c a INTEL __________________________________________________________________________________________ ____ Nh bi t, trong cc h th ng truy n d li u c hai cch a tn hi u ln ng truy n: n i ti p v song song. Cch truy n song song th ng c truy n trn m t kho ng cch ng n, v d gi a cc thi t b trong cng m t phng nh t my tnh sang my in. Cch truy n n i ti p th ng c th c hi n khi kho ng cch truy n kh xa. Ngoi ra, trong cch truy n n i ti p, d a vo cch th c hi n s ng b gi a n i pht v thu ta c hai ch ho t ng: ng b v b t ng b . Trong ch b t ng b , xung ng h c t o ra m t cch ring r my pht v my thu d a vo t n s danh nh t ng ng v i v n t c truy n (bit rate ho c baud rate). Trong ch ng b , n i pht c th g i xung ng h t i n i thu theo m t knh truy n song song v i knh truy n d li u ho c n i thu t t o ra xung ng h b ng cch tch tn hi u th i gian t dng d li u. Ch ng ny bn n ch truy n n i ti p b t ng b . Chng ta s l n l t gi i thi u tnh ch t chung c a h th ng truy n d li u, cc giao th c c a h th ng truy n b t ng b . Chng ta c ng s kh o st vi IC th c hi n ch c n ng bi n i song song n i ti p trong cc thi t b thu pht . 4.1 H TH NG TRUY N D LI U 4.1.1 V n hnh M t m u h th ng truy n d li u g m 3 b ph n chnh (H 4.1) - M t c p thi t b x l tn hi u (Terminal, vd my tnh), m t c a my pht (chuy n thng tin thnh tn hi u s ) v m t c a my thu (chuy n d li u s thnh thng tin)....
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chap4 - ___________________________________________Ch ng 4...

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