7/27/2019 tng i NEAX 61

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1 Gii thiu chung.

Tng i NEAX61 do hng NEC ca Nht Bn sn xut.

H thng tng i NEAX61 c cu hnh linh hot, phc v cho cc ng dng nhng vng dn c khc nhau.

Tng i NEAX61 c th ng dng cho: Tng i chuyn tip (toll) chuyn mchni ht (Local) mng N-ISDN mang s a dch v bng hp ISDN.

Tng i NEAX61 c s dng ng Highway tiu chun CCITT tin cho victrao i thng tin gia cc b x l v trao i thng tin gia cc thit b.

H thng ny c kh nng pht trin m rng mt cch d dng. N c chp nhnl mt mng khng b tc nghn vi 2 b nh m input/ output ca mng chuyn mchthi gian.2 c im v cu trc phn cng h thng.H thng chuyn mch NEAX61 chia thnh cc phn h:Phn h ng dng, phn hchuyn mch, phn h x l v phn h vn hnh, bo dng. Phn h chuyn mch baogm mng chuyn mch phn chia thi gian, b iu khin ng thoi. Mng chuynmch phn chia thi gian l trng chuyn mch ghp T-S-T. B iu khin ng thoichuyn mch thi gian TSW v chuyn mch khng gian SSW theo cc bn tin iukhin t b x l cuc gi CLP thng qua HUB trong phn h x l. Cu trc ghp nitrng chuyn mch c th hin nh hnh sau:

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Cc khi chc nng c bn trong phn h chuyn mch:

- Giao tip KHW ( KHW1) Card P-8A4W: Nhn cc loi tn hiu t TSC v tnghp cc mu, ng k knh trng thi ST ri gi chng ti khi x l bn tin giaothc PMH; la chn khi chuyn mch thi gian TSW lm vic, tm cc li v

thng bo ti h thng; ghp tn hiu thoi t TSW, tn hiu trng thi t khi iukhin chuyn mch thi gian TSC v tn hiu bn tin t HUBI thnh tn hiuKHW, v gi tn hiu KHW ti phn h ng dng

- Khi giao tip HUB ( HUBIU) Card P-8A8J: Tp hp li cc tn hiu bn tin t dliu ph hp nm trong cc t bo iu khin nhn c thng qua HUB v gicc tn hiu ti TSC v KHW1; tch cc tn hiu bn tin nhn c t TSC vKHW1, chn cc tn hiu vo t bo iu khin ti HUB.

- Khi chuyn mch thi gian TSW Card P-8A4X: Thc hin chuyn mch thigian ca tn hiu thoi nhn c t KHW1 ph hp vi tn hiu iu khin t

TSC v gi tn hiu thoi thng qua JHW ti SSW; nhn cc thng tin li tHUBIU, TSW, KHW1 v cc khi khc v gi cc thng tin ti b x l cuc giCLP.

- Khi chuyn mch khng gian SSM Card P-8A4S: Thc hin chuyn mch khnggian v giao tip vi chuyn tip ng cao tc JHW; thc hin chuyn mchkhng gian ca tn hiu thoi nhn c t JHW1 ph hp vi tn hiu iu khint SSC v gi chng ti JHW1.

3 c im phn mm.

- Phn mm ca tng i c s dng h iu hnh UNIX, v c cu trc phn cp.- Tu thuc vo loi ti nguyn qun l v iu khin. Cc ti nguyn trong cc lpkhc nhau c qun l v iu khin n nhm m bo khi ti nguyn trong mt lpc b xung v sa i th khng lm nh hng ti lp khc.

4 Tnh nng, ch tiu k thut.

4.1 Tnh nng ca h thng

S dng cc ng truyn d liu tc co tiu chun kt ni gia cc thitb, truyn dn dng t bo ( cell ) tc co cho vic trao i thng tin gia cc b x l

vi cc thit b.

Kch c v ng dung lng h thng c th lp t theo mun v c th b xung.

Trng chuyn mch l non-blocking v chuyn mch thi gian c b m kp.H thng chuyn mch chnh xc v trnh t theo khe thi gian. V vy h thng khngnhng p ng cho chuyn mch thoi m cn cho c chuyn mch d liu.

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Phn mm s dng h iu hnh UNIX v c cu trc phn cp.

Giao tip ngi my cho php s dng hai giao tip l bng ha GUI vgiao tip bng k t CUI. Cho php ngi s dng trnh by v qun l d dng v nhanhhn.

C giao tip cho kt ni thit b thu vn hnh bo dng trong h thng chuynmch ti thit b vn hnh bo dng ca trung tm bo dng OMC.

4.2 Ch tiu k thut

- Vi h thng tng i c cu hnh ti a ( Multi-Processor)

Dung lng ng dy thu bao MAX : 700.000 lines

S trung k (local) : 40.000 lines

Nu lm tng i chuyn tip (toll) : 130.000 trunksLu lng : 67.000 Erlang

Kh nng x l cuc gi gi cao im : 8.000.000 BHCA

- Vi h thng c cu hnh ti thiu ( Single-Processor) hay l RSU

Dung lng : 32.000 ng thu bao

Lu lng : 4.800 Erlang

Kh nng x l cuc gi gi cao im 144.000 BHCA

- Khi ng dy xa : RLU

Dung lng : 3.328 ng thu bao

Hoc 256 BRIs ( Base Rate Interface ) giao tip tc c s 2B+D.

- Khi ng dy m rng ELU

720 ng thu bao

Hoc 240 BRIs ( Base Rate Interface ) giao tip tc c s

- Tiu chun phc v

Lu lng cho mi trung k 0,8 Erlang/ 1 trung k trong iu kin lm vic bnhthng.

tin cy ca h thng cao phc v lin tc trong khong 20 nm. Trong thigian b ngng tr nh hn 1 gi/ 20 nm.

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- Tc x l a im giao tip

Theo tiu chun CCITT: tc ly mu knh 8Khz

S bt tn hiu 8bit/ knh

- Ngun cung cp

DC: - 48 n 58 vn

AC : 100V

- iu kin mi trng

Nhit t 5 n 40 C ( vi thi gian ngn thit b chu c : 0 n 50 C)

m ( 20 n 80)% ( khng ng hi nc)

Cho php ( 10 n 90)% trong thi gian ngn. cao: cao so vi mc nc bin 61 n 3048m

- iu kin lp t khung gi

cao nn di cu cp

Khung gi:

Cao : 1.8 m

Rng: 0,7 mSu : 0,6 m

Nng 350kg ( khi a y cc thit b vo khung).