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    M ng truy n s li u chuy n m ch gi X25

    Cc thnh ph n c a m ng chuy n m ch gi X.25 - Giao th c m ng chuy n m ch gi B o m t trong cc m ng chuy n m ch gi Khi no s d ng chuy n m ch gi Cc giao ti p v t l c a m ng chuy n m ch gi Trang b cho cc m ng chuy n m ch gi

    3. Cc thnh ph n c a m ng chuy n m ch gi

    3.1. M u 3.2. Cc tuy n lin l c c a m ng 3.3. Thi t b chuy n m ch gi

    o 3.3.1. Giao ti p l p v t l o 3.3.2. Giao ti p l p tuy n o 3.3.3. Modul chuy n m ch gi o 3.3.4. Modul qu n l m ng o 3.3.5. C u trc ph n c ng c a cc b chuy n m ch

    gi

    o 3.3.6. c tnh c a thi t bi chuy n m ch gi 3.4. Cc PAD

    o 3.4.1. Giao ti p khng ng b o 3.4.2. Module chuy n i k t - gi o 3.4.3. Module giao th c l p m ng o 3.4.4. Giao ti p l p tuy n o 3.4.5. Giao ti p v t l o 3.4.6. Module qu n l m ng o 3.4.7. C u trc ph n c ng c a PAD o 3.4.8. Ch t l ng c a PAD

    3.5. Cc giao ti p ch o 3.5.1. C u trc ph n c ng c a giao ti p ch o 3.5.2. Hi u qu c a giao ti p ch

    3.6. Cc ng n i c ng m ng o 3.6.1. Ph n c ng c a c a c ng o 3.6.2. Hi u ch c a c a c ng

    3.7. H th ng qu n l m ng

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    o 3.7.1. Giao ti p qu n l m ng NMS o 3.7.2. Ph n c ng v ph n m m c a NMS

    3.8. K t lu n

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    Tu thu c vo t ng ki u chnh xc c a tuy n thng tin, c th c m t tn hi u ng h ring cho m i h ng chuy n tin; ch m t ng h c dng cho c hai h ng ho c khng c tn hi u ng h no c . tr ng h p sau, lu ng s li u cng mang theo c thng tin v ng h nh p. C nhi u ph ng php ring m ho lu ng s li u cho php ng h ny c th tch ra t s li u m t lo i k thu t c g i l "m ho Manchester".

    h u h t cc tr ng h p c s khc bi t gi a cc giao ti p m i pha c a tuy n lin l c. M t u g i l "thi t b k t cu i m ch i n s li u", hay DCE. Cn u kia g i l

    "thi t b u cu i s li u", hay DTE. Ni chung cc thi t b trong m ng (t c l cc nt chuy n m ch gi) l cc DCE giao ti p v i cc thi t b u cu i pha ngoi vnh ai m ng. Cn cc thi t b u cu i i di n cho DTE u n i v i cc giao ti p DCE. Khi u n i vo m ng thng tin th lun ph i c m t CDE c a m ng v thi t b ng i s d ng ph i c m t giao ti p DTE.

    m c ny th gi a DCE v DTE khc g nhau? h u h t cc tr ng h p, giao ti p DCE cung c p cc tn hi u ng h nh th i cho tuy n. DTE c n s d ng thng tin nh th i do DCE cung c p khi l y m u s li u thu c v pht s li u. Cn c s khc bi t v v t l gi a cc giao ti p DCE v DTE. Cc giao ti p DCE lun s d ng cc b u chuy n ci, "trong khi cc giao ti p DTE th s d ng cc b u chuy n c". i u ny l i lin quan n tnh

    tr ng m ng cng c ng, v an ton i n, cc m ch i n n i tr c ti p vo giao ti p m ng cng c ng khng bao gi c l chn ra. i u ny s x y ra n u s d ng b n i chuy n c cho cc DCE.

    ng dy ph thng nh t cho cc tuy n c a m ng chuy n m ch gi l cc i dy xo n ho c cp nhi u s i thng th ng. Cc i dy xo n l ki u c bi t c a cp nhi u s i. y cc c p dy c a cp c xo n quanh nhau d c theo s i cp. i v i m t s lo i tn hi u i n

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    (v d nh giao ti p X.21) th cp c s d ng ph i l dy cp xo n v n r t quan tr ng cho thao tc c a thi t b i u khi n v thi t b thu m i u cp.

    Ki u dy n i ny c th dng cho b t k t c s l ng no t i 10 tri u bit m i dy c ly r t ng n. Cp di t i a 1 km cng c th c s d ng cc t c th p h n. N u c n c t c cao h n ho c c ly di h n th th ng s d ng cp quang. T t c cc giao ti p v t l cho cc m ng chuy n m ch gi s c p chi ti t ch ng 10.

    3.3. Thi t b chuy n m ch gi

    Thi t b chuy n m ch gi l trung tm c a m ng chuy n m ch gi. Chng t o ra cc phn vng c a m ng (nh m t nhi u s m ng) v t o ra m ng chuy n m ch gi hon ch nh c nhi u c tnh khai thc quan tr ng. V v y c n ph i m b o ch c ch n r ng, cc thi t b chuy n m ch gi c ch n cho m t m ng ph i c c tnh v kh