Mang the he sau

8/9/2019 Mang the he sau

1/71

Gio vin hng dn: o Ngc Chin

Sinh vin thc hin: Trn Th Ngc

Lp : T7K48


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1.C IM CA MNG VIN THNGHIN TI

Cc mng vin thng hin nay c cim chung l tn ti mt cch ring l,ng vi mi loi dch v thng tin li ct nht mt loi mng vin thng ringbit phc v dch v .

Mng Telex: Dng gi cc bc indi dng k t c m ho bng5bit.Tc truyn thp (75 ti 300bit/s).

Mng in thoi cng cng

(POTS):thng tin ting ni c mho v chuyn mch h thngchuyn mch in thoi cng cngPSTN.


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1.C IM CA MNG VIN THNGHIN TI

Mng truyn s liu:gm cc mng chuynmch gi trao i d liu da trn X25 v hthng truyn s liu chuyn mch knh da trnX21.

Truyn hnh: truyn bng sng v tuyn, CATV,DBS.

Mi mng c thit k cho cc dch v ring

bit v khng th s dng cho cc mc chkhc. V d ta khng th truyn ting ni quamng chuyn mch gi X25 v tr qu ln.


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2.NHNG HN CH CA MNG VINTHNG HIN TI

H thng mng vin thng hin ti c nhiunhc im m quan trng l:

Ch truyn c cc dch v c lp tng

ng vi tng mng.Thiu mm do.Km hiu qu trong vic bo dng, vn

hnh cng nh s dng ti nguyn. Tinguyn sn c trong mt mng khng thchia s cho cc mng khc cng s dng.


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3. NHNG YU T THC Y MNGTH H MI.

S a dng ca ccthit b.

Cc ng dng thng

mi in t v cc ngdng ph thuc v tr.

S m rng cc thtc IP thc hin ctnh di ng v phmvi rng ca QoS. Nhu cu tin ho mng


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3.NHNG YU T THC Y MNGTH H MI.

Cc giao din v tuyn vkt ni mng ng

Yu t c nhn v bo

mt.Cc c ch ci thin vng

ph.Vic s dng ph tn

ng v ci thin ph tn.

Chin lc pht trin


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Hy vng ca NGN:


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4.NH NGHA MNG NGN

Hin nay cha c nh ngha cth v chnh xc no v mngNGN.NGN c th xem l:- L mng hi t c thoi, videov d liu trn mt c s htng da trn nn tng ca giaothc IP, lm vic c trn haiphng tin truyn thng vtuyn v hu tuyn.- L s kt hp cu trc mng

hin ti vi cu trc mng adch v da trn c s h tngc sn vi s hp nht cc hthng qun l v iu khin. Topo mng NGN


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5.C IM CA MNG NGN

Mng NGN c 4 c im chnh:

5.1.Nn tng l h thng mng m:

- Cc khi chc nng ca tng i truynthng chia cc phn t mng c lp, ccphn t c phn theo chc nng tngng v pht trin mt cch c lp.

- Giao din v giao thc gia cc b phnda trn cc tiu chun tng ng.


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5.C IM CA MNG NGN

5.2. S dng cng ngh chuyn mch mm(SW- Softswitch) thay th cc thit b tng iphn cng. Cc mng ca tng dch v ring r

c kt ni vi nhau thng qua s iu khinca mt thit b tng i duy nht, thit b tngi ny da trn SW.

5.3. Mng bng thng rng cung cp a dch v:

mng truyn dn quang vi cng ngh WDHhay DWDH.


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5.C IM CA MNG NGN

5.4. Mng NGN l mng chuyn mch gi,da trn mt giao thc thng nht. Cngvi s pht trin ca cng ngh IP, ngi

ta mi nhn thy r rng l mng vinthng, mng my tnh v mng truynhnh cp cui cng ri cng tch hp trong

mt mng IP thng nht, l xu hngln m ngi ta thng gi l dung hpba mng .


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5.C IM CA MNG NGN

So snh cng ngh mng hin ti v tng lai:

,PON


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5.C IM CA MNG NGN

Chuyn mch knh & chuyn mch mm:


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6.CU TRC MNG NGN

Cu trc mng NGN baogm 5 lp chc nng:

Lp ng dng/dch v.

Lp iu khin.Lp chuyn ti dch v.Lp truy nhp dch v.

Lp qun l.Cu trc chc nng ca mng NGN


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6.CU TRC MNG NGN

6.1.Lp ng dng/dch v (Application/ServiceLayer):- Cung cp cc dch v n ngi s dng 1

cch thng nht v ng b, cc dch v cbng thng khc nhau v nhiu mc khcnhau.- H thng ng dng/dch v ny lin kt vi lp

iu khin thng qua giao din m API.- Cung cp cc ng dng v dch v nh: dchv mng thng minh IN,tr tin trc


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6.CU TRC MNG NGN

6.2. Lp iu khin (Control Layer):- Gm cc h thng iu khin m thnhphn chnh l SW (MGC).

- Cn t chc theo kiu module v gm mts khi iu khin c lp.- C nhim v kt ni cung cp cc dchv thng sut t u cui n u cui vi btk loi giao thc v bo hiu no.


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6.CU TRC MNG NGN


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6.CU TRC MNG NGN

6.3. Lp chuyn ti dch v (Service Transport/CoreLayer):

- Thit b l cc cng truyn thng MG:+ cc cng truy nhp:AG (Access Gateway) kt ni gia

mng li vi mng truy nhp,RG (Residental Gateway)kt ni gia mng li vi mng thu bao ti nh.+Cng giao tip: TG(Trunking Gateway) kt ni giamng li vi mng PSTN/ISDN, WG(Wireless Gateway)kt ni mng li vi mng di ng.

- Cc nt chuyn mch (ATM+IP) v cc h thng truyndn (SDH, WDM) thc hin chc nng chuyn mch,nh tuyn cuc gi gia cc thu bao.- Hin nay vn cha r l ang s dng ATM hay MPLScho lp ny.


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6.CU TRC MNG NGN

6.4. Lp truy nhp dch v (Service AccessLayer): bao gm cc thit b truy nhp cung cpcc cng kt ni vi thit b u cui thu bao

qua h thng mng ngoi vi cp quang, hocthng qua mi trng v tuyn

6.5. Lp qun l (Management Layer): y l lpc bit xuyn sut cc lp trn. Chc nng

qun l c ch trng l: qun l mng, qunl dch v, qun l kinh doanh.


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6.CU TRC MNG NGN

T nhng phn tch trn, ta c s cc thc th chc nng trong mng NGN:

Cc thc th chc nng trong NGN


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6.CU TRC MNG NGNNhim v ca tng thc th:

AS-F:cung cp cc logic dch v v thi hnh mt hay nhiu cc

ng dng dch v.MS-F:cung cp cc dch v tng cng x l cuc gi.N hotng nh 1 server x l cc yu cu t AS-F hoc MGC-F.MGC-F:cung cp logic cuc gi v tn hiu bo hiu x l cuc gicho mt hay nhiu MG.

CA-F: l 1 phn chc nng ca MGC-F,n c kch hot khiMGC-F thc hin vic iu khin cuc gi.IW-F:l 1 phn chc nng ca MGC-F, c kch hot khi MGC-Fthc hin bo hiu gia cc mng bo hiu khc nhau.R-F:cung cp thng tin nh tuyn cho MGC-F.

A-F:cung cp thng tin dng cho vic tnh cc.SG-F:chuyn thng tin bo hiu ca mng PSTN qua mng IP.MG-F:chuyn thng tin t dng truyn dn ny sang dng truyndn khc.


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7.CC THNH PHN CA NGN

Cc thnh phn c bn ca NGN:1. Media Gateway (MG)2. Media Gateway Controller (MGC

- Call Agent - Softswitch)3. Signaling Gateway (SG)

4. Media Server (MS)5. Application Server (Feature

Server)

Tng quan cc thnh phn trong NGN

Cc thnh phn NGN trong mi lp


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7.CC THNH PHN CA NGN 7.1.Chuyn mch mm SW

(MGC):- L thit b u no trong mngNGN.

- Lm nhim v iu khin cuc gi,bo hiu v cc tnh nng to

mt cuc gi trong mng NGN hocxuyn qua nhiu mng khc (PSTN,ISDN).MGC iu khin cuc gi thng quacc bo hiu, c 2 loi chnh:

+ Peer to peer : giao tip SW

v SW, giao thc s dng BICC haySIP.+ iu khin truyn thng: giao

tip SW v Gateway, giao thc sdng MGCP hay Megaco/H.248

V tr ca SW trong m hnh phn lpchc nng ca NGN

MGC kt ni vi cc thnh phn khc ca NGN


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7. CC THNH PHN CA NGN

Qu trnh thc hin 1 cuc gi khi s dng chuyn mchmm:


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1. Thu bao nhc my chun b thchin cuc gi, tng i ni ht qun lthu bao s nhn bit trng thi off-hook ca thu bao.SG ni vi tng iny thng qua mng SS7 cng nhnbit c trng thi mi ca n.

2. SG s bo cho MGC trc tip qun lmnh CA-F ng thi cung cp tn hiuDial-tone cho thu bao.Ta gi MGCny l Caller-MGC.

3. Caller-MGC gi yu cu to kt ni

n MG ni vi tng i ni ht banu nh MGC-F.

V d s dng MGC


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7. CC THNH PHN CA NGN

4. Cc s do thu bao nhn s c SG thu nhn v chuyn ti Caller-

MGC.5. Caller-MGC s dng s ny quyt nh cng vic tip theo s thc

hin.Cc s ny s c chuyn ti chc nng R-F v R-F s dngthng tin lu tr ca cc server quyt nh tuyn cuc gi. Nu thubao b gi cng thuc s qun l ca Caller-MGC th thc hin bc 7,cn nu thu bao b gi thuc MGC khc th thc hin bc 6.

6. Caller-MGC gi yu cu thit lp cuc gi n 1 MGC khc.Nu chan ng MGC ca thu bao b gi (Callee-MGC) th MGC ny s tiptc chuyn yu cu n ng Callee-MGC.V MGC trung gian lun gili phn hi n MGC gi yu cu n n, vic ny c thc hin nhCA-F.

7. Callee-MGC (Calleer-MGC) yu cu to kt ni vi MG ni vi tng i

ni ht ca thu bao b gi Callee-MG (Calleer-MG).


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7. CC THNH PHN CA NGN8.Callee-MGC (Calleer-MGC) gi thng ip n Callee-SG(Calleer-SG) thng qua

mng SS7 lm rung chung thu bao b gi.9. Khi Callee-SG(Calleer-SG) nhn c bn tin bo trng thi ca thu bao b gi (gis ri) n s gi thng tin ny tr v Callee-MGC (Calleer-MGC).

10. Va callee-MGC se phan hoi ve caller-MGC e bao mnhang lien lac vi ngi c goi.

12. Callee-MGC gi thong tin e cung cap tn hieu ring back

tone cho caller-MGC, qua caller-SG en ngi goi.13. Khi thue bao b goi nhac may th qua trnh thong baotng t cac bc tren xay ra: qua nut bao hieu so 7,thong tin nhac may qua callee-SG en callee-MGC, roi encaller-MGC, qua caller-SG roi en thue bao thc hien cuocgoi.

14. Ket noi gia thue bao goi i va thue bao b goi c hnhthanhthong qua caller-MG va callee-MG.

15. Khi cham dt cuoc goi th qua trnh se dien ra tng tnh luc thiet lap.


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7.2.Cng truyn thng (Media Gateway MG)

- L thnh phn nm trn lp chuyn tidch v (lp truyn thng).

- Chuyn i vic truyn thng t mtnh dng truyn dn ny sang mt nhdng truyn dn khc.

- MG thc hin vic m ho, gi m vnn d liu thoi.

- MG cung cp mt phng tin truynthng truyn ti thoi, d liu, fax vhnh nh gia mng truyn thng PSTNv mng gi IP.

Cu trc ca MG


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MG ch cn thit khic c s h tngTDM ( khng cn

chc nng MG chovic truyn thngend-to-end mnggi nh IP-phone

gi IP-phone).

Tr trong VoIP


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iu khin ting vng(ITU-T G131)

Nguyn nhn chnh to ting vngtrong mng TDM


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Gii php trit ting vng TDM Gii php trit ting vng trong NGN


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7.CC THNH PHN MNG NGN

7.3. Cng bo hiu (SG Signaling Gateway):- ng vai tr nh mt cnggiao tip gia mng bo hius 7 (SS7) v cc im c

qun l bi thit b SW trongmng IP.- SG i hi 1 ng kt ni vtl n mng SS7 v phi sdng cc giao thc ph hp

- SG to cu ni gia mng IPv SS7 di s iu khin caSW.

- Vi thoi v bo hiu cnhn trn cng 1 knh, SG

thng c tch hp trn MG.

SG c tch hp trn MG


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7.4. Media Server (MS):Media Server phn pht dch v thoi v video trn

mng gi , nh cu hi ngh (nu khng c h trbi MG), thng bo (cc thng bo n gin do MG

gi), I.N. (Intelligent Network) v mt s tng tc vingi dngTrn th trng, chng l thit b c iu khin bng

SIP hoc H.248/MGCP v l gii php ca SRPs( Service Resource Point h tr cho I.N. ).

Chc nng Media Server c th c tch hptrong Softswitch hoc Media Gateways.


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V d v mt cuc ni vi I.N.


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7.5. Application Server (Feature Server): Chc nang cua Feature Server :

Xac nh tnh hp le va ho tr cac thongso dch vu thong thng cho he thong achuyen mach.

* Mot vai v du ve cac dch vu ac tnh :- He thong tnh cc - Call Agents s dungcac bo CDR (Call Detail Record)

- H.323 Gatekeeper- dch vu nay ho tr nhtuyen thong qua cac mien khac nhau( cac mang khac nhau).

- VPN- Dch vu nay se thiet lap mang riengao cho khach hang

Cu trc ca Server ng dng


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8.CC GIAO THC HOT NGTRONG NGN

Cc giao thc s dng trong NGN


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y ch xt mt s giao thc c bn:MGCP ( Media Gateway Control Protocol):

- L giao thc VoIP, dng iu khin MG t

MGC.- MGCP l mt giao thc ch/t m qua MG sthc thi cc lnh c gi t MGC.MG truyn ticc loi tn hiu nh thoi, d liu, hnh nh giamng IP v PSTN.


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Megaco/H.248:- Megaco, H.248 ging nhauu l giao thc iu khinMG.

- Megaco c pht trin biIETF (a ra vo cui nm1998), cn H.248 c ara vo thng 5/1999 biITU-T. Sau c IETF vITU-T cng hp tc thng

nht giao thc iu khinMG, kt qu l vo thng6/2000 chunMegaco/H.248 ra i.

S hnh thnh H.248/Megaco


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- Megaco/H.248 l bohiu gia SW vi MG.Megaco/H.248 iu khinMG kt ni cc lungt ngoi.- Megaco/H.248 tng tvi MGCP v mt cu trcv mi lin h gia biu khin v cng

Gateway, tuy nhinMegaco/H.248 h tr adng hn cc loi mng.


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BICC (Bearer Independent Call Control)- L giao thc bo hiu gia 2 MGC, c th t cc nhcung cp khc nhau, nhm mc ch m bo lu lngthoi dng k thut gi(VoP).- BICC h tr cc dch v bng hp (PSTN, ISDN) mtcch c lp vi ng truyn v k thut chuyn ti bntin tn hiu.- Thng qua bo hiu BICC, mng NGN vi nn tngchuyn mch gi IP c th cung cp y cc dch vbng hp.

- Trong BICC, giao thc bo hiu iu khin ngtruyn ph thuc vo cng ngh ng truyn lp dinh ATM, IP/MPLS.


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Hnh bn m t ngdng ca BICC trongvic lin kt hot nggia mng truynthng (PSTN/ISDN) vmng NGN. Hai thubao in thoi truyn

thng lin lc vi nhauthng qua s iukhin ca softswitchtheo bo hiu BICC.


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SIP (Session Initiation Protocol):- L giao thc iu khin lp ng dng c thit kv pht trin bi IETF.- Giao thc SIP c s dng khi to, iu

chnh v chm dt cc phin lm vic vi mt haynhiu yu t tham d.- L giao thc bo hiu m, mm do v c kh nngm rng, SIP khai thc ti a cng c Internet tora nhiu dch v mi trong NGN. SIP cn dng lm

bo hiu gia hai SW.- Hin nay, SIP ang tr thnh s la chn thayth H.323 tr thnh mt giao thc im ni im(end to end) trong cng ngh SW


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Hot ng c bnca SIP:

1.Tm v v ngi dnghin ti gi bn tin

mi.2. Mi tham gia phinthoi.

3. Mang thng tin phinthoi.

Trong SIP ngi dngc nh a ch nha ch email Lu tng quan v cuc gi SIP


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H.323- L giao thc chun cho viclin lc bng thoi, hnh nhv d liu trong h thng

mng IP.- L tp hp cc chun ca ITUcho vic truyn thng aphng tin v l mt trongnhng chun chnh thc cho

VoIP nh Megaco hay SIP.- Cc thnh phn trong cutrc H.323 gm: terminal,gateway, gatekepeer M hnh mng H.323 n gin


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Tng quan v cuc gi trong H.323:Qua trnh thc hien 1 cuoc goi tieubieu trong H.323 bao gom cac giaioan sau: Kham pha GK va ang ky: sdung bao hieu RAS.

Thiet lap cuoc goi: lan lt sdung bao hieu RAS (co the trong giaioan nay xay ra qua trnh xac nhiem cuoi thong qua b danh alias) vaH.225. Qua trnh thng thao cac thong

so cuoc goi va xac nh kha nangcua iem cuoi: s dung bao hieuH.245. Qua trnh trao oi thong tin: sdung giao thc RTP/ RTCP. Ket thuc cuoc goi: lan lt s

dung bao hieu H.245, H.225 va RAS.


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SIGTRAN (SignallingTransport Protocal):

- Dng truyn thng tin bohiu ca mng PSTN qua

mng IP. y l mt giaothc truyn ti mi, cxy dng thay th TCP trongvic truyn tn hiu SS7.

- SIGTRAN l 1 nhm nghin

cu thit k ra 1 s giao thckhc nhau:

.

Nhm lm vic SIGTRAN


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+ SCTP cung cp 1 phng thc kt ni thayth cho giao thc khng p ng c theo quanim thi gian thc v d tha, TCP.

+ M2UA: kt ni ti cc thit b c m khng yu cu

s SP mi.+ M2PA v M3UA: kt ni gia cc im bo hiucho php IP.

+ SUA: kt ni vi cc im bo hiu cho php IP

vi cc ng dng TCAP (SCP,HLQ).+ IUA, V5UA: truyn ti bo hiu thu bao tiSoftswitch


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9.CC CNG NGH LM NN CHONGN

Theo ITU, c 2 xu hng t chcmng chnh:

- Hot ng kt ni nh hng (CO Connection Oriented Operation):cccuc gi c thc hin vi trnh t:gi s - xc lp kt ni - gi v nhn

thng tin - kt thc.Cng ngh ATMpht trin cho php y mnh ccdch v bng rng v nng cao chtlng dch v.

- Hot ng khng kt ni (CL Connectionless Operation): da trn

giao thc IP nh vic truy cpInternet khng yu cu vic xc lptrc cc kt ni.

Cc xu hng pht trintrong cng ngh mng


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Cc cng ngh l: IP ATM IP/ATM MPLS


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IP:- IP l giao thc chuyn mch gi c tincy cao v kh nng m rng cao.

- Do phng thc nh tuyn theo tngchng nn iu khin lu lng rt kh.

- u im: n gin, hiu qu.

- Nhc im: Khng h tr QoS.


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ATM:- S dng gi tin c chiu di c nh 53byte(cell).

- Ngun tc nh tuyn: chuyn i VPI/VCI.- Nn tng phn cng tc cao.

- u im: Tc chuyn mch cao, mm

do,h tr QoS theo yu cu.- Nhc im: Gi thnh cao, khng mm dotrong h tr cc ng dng nh IP, VoA.


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IP over ATM: - IP over ATM truyn thng l mt loi k thut kiu xp

chng, n xp chng IP (k thut lp 3) ln ATM (k thutlp 2).

- u im: l k thut c chn trc tin cho yu cutnh thi gian thc tng i cao i vi mng li.- Nhc im:+ IP over ATM vn khng c cch no m bo QoSthc s.

+ Vi phng thc xp chng th kh nng m rng vncha .


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MPLS - k thut chuyn mch nhn a giaothc:- MPLS l mt cng ngh kt hp gia chuyn mch lp 2 v nh tuyn lp 3.

- Chuyn gi tin trn c s nhn qua cc ng chuynmch nhn LSP.

9 CC CNG NGH LM NN CHO


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MPLS c xy dng trnc s IP-nh tuyn tngchng.

Phn b nhn



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Lable switched path (LSP) MPLS c gi l a giao thcbi v nhng l do sau:MPLS c nhm n hot ng trn nhiu tuyn khcnhau.

c bit l cho cc lp tuynang tn ti sau:

- ATM: nhn c cha trongphn VCI/VPI ca ATM header.

- Frame Relay: nhn c

cha trong trng DLCI trongFR header.- PPP/LAN: s dng nhn

chn gia L2 v L3 headers.Phin dch gia cc loi calp tuyn phi c h tr.



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- C th p dng trn nhiu mi trng khc nhau: IP, ATM,Ethernet- Nhc im:

+ Phc tp trong kt ni.+ Kh thc thi QoS xuyn sut.

- u im:+ Tch hp cc chc nng nh tuyn, nh a ch, iu

khin.+ Kh nng m rng tt.+ Kt hp gia IP v ATM cho php tn dng ti a thit b,

nng cao hiu qu u t.+ S phn tch gia iu khin v chuyn mch cho php

MPLS c trin khai trn nhiu phng tin.


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10. CC DCH V CHNH TRONG NGN

Mc tiu chnh cadch v NGN l chophp khch hng

c th ly thng tinm h mun btk dng no, trongbt k iu kin

no, ti mi ni vdung lng tu .Mng a dch v


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1. Dch v thoi ( Voice Telephony):vn cung cp cc dch v tnti nh ch cuc gi, chuyn cucgi, cuc gi 3 bn nhng vicng ngh mi.

2. Dch v d liu (Data Service):cc dch v d liu c kh nngthit lp kt ni theo bng thngv cht lng dch v QoS theoyu cu.

3. Dch v a phng tin

(Multimedia Service): cho phpngi tham gia tng tc vinhau qua thoi, video, d liu. Mt s dch v NGN in hnh.


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4. Dch v s dng mngring o (VPN):- thoi qua VPN ci thinkh nng mng, chophp cc t chc phntn v a l, c khnng m rng v phihp vi cc mng ringl ang tn ti.- D liu VPN cung cpthm kh nng bo mtv cc thuc tnh khc.

Dch v VPN tin tin cho SOHO


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5. Thng mi in t (E - Commerce):- Cho php khch hng mua hng ho, dch vc x l bng in t trn mng, bao gm:vic x l tin trnh, kim tra thng tin thanhton tin, bo mt, ngn hng ti nh, i chti nh- Cn c m rng sang lnh vc di ng (M- Commerce). y l loi dch v cho phpngi s dng tham gia vo th trng thngmi in t qua cc thit b di ng cm tay.


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10. CC DCH V CHNH TRONG NGN3 c trng quan trng nht ca mi

trng iu khin mng th h mi:Kin trc phn lp:

- cho php nh cung cp la chn ccphng thc truyn ti thng tin khngph thuc vo phn mm iu khin.

- S tch gia truy nhp, dch v v iukhin phin trong lp dch v cho php

mi phin c x l c lp so vi ccphin khc.Do nhiu phin dch v cth bt u t 1 phin truy nhp.- Cho php cc dch v pht trin clp vi truyn dn v kt ni.

Cu trc iu khin phn lp


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Cc giao din m API:- moi trng phat trienm da tren giao dien laptrnh ng dung (API) se chophep cac nha cung capdch vu, cac nha phat

trien ng dung va cackhach hang tiem nang taova gii thieu cac ngdung mot cach nhanhchong- No cung m ra nhieu choi e tao ra va phanphoi cac dch vu cho nhieukhach hang hn

Kin trc phn lp/Giao din dch v m


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Mng thng minh phn tn:

- Moi trng x ly phan tanNGN (DPE - Distributed ProcessingEnvironment) se giai phong tnhthong minh t cac phan t vat lytren mang.- V du, kha nang thong minh cuamang co the nam cac server chomot dch vu nao o, tren cacserver nay thc hien cac chc nang

cu the ( v du nh cac iem ieukhien dch vu SCP, cac node dch vutrong mot moi trng AIN), hoactren cac thiet b au cuoi gankhach hang. Cac khanang thc hien se khong b rangbuoc trong cac thanh phan vat lycua mang.

NGN vi cc nt truy nhp phn tn

11 S TIN HO T CC MNG LN


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11.S TIN HO T CC MNG LNNGN

S pht trin t PSTN ln NGN:



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i vi cc mng dch v khc:

Mng hin ti

GE: Gigabit Ethenet



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S pht trin ca mng hu tuyn datrn cng ngh IP:

12 CHIN LC PHT TRIN NGN


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12.CHIN LC PHT TRIN NGNCA NGNH

C 2 hng pht trin mng NGN: Xy dng mng NGN da trn c s

mng hin c. Xy dng mt mng NGN hon ton

mi.



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Xy dng NGN trn c s mng hin ti:- C s h tng ca mng hin ti t chc liv nng cp dn ln.- Nng cp cc thit b chuyn mch hinc(TDM) h tr cc dch v mi tc cao:video, s liu.

- B sung mt s chuyn mch mm.- u im: Gi thnh u t ban u thp; ckh nng cung cp dch v mi, dch v truynhp bng rng;tn dng c CSHT hin ti.

- Nhc im:

+ Khng gii quyt c vn c bn l khnng to dch v mi.+ Chi ph vn hnh v khai thc cao hn.+ Kh nng cnh tranh km.



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Xy dng mt mng NGN honton mi:- Gi nguyn mng hin ti, khng phttrin tip. Tp trung nhn lc, ti lc trinkhai cc tng i a dch v th h sau.

- Nhc im:+Gi thnh u t ban u cao.+Ri ro d bo nhu cu vt ngngdn n hu qu u t thp,hon vnlu.

- u im:+ Tng kh nng cnh tranh.+ tng thch cao.+ Qun l tp trung, thng nht.+ Hon thnh sn sng cung cp dch v

mi, dch v truy nhp bng rng.


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Mang the he sau

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