Bo co thc tp tt nghip

Bao cao thc tpMang MAN E va cac ng dung

Bo co thc tp tt nghip

Tm hiu cng ngh MAN Ethernet v cc ng dng

Mc lc2Phn I Tng quan v mng NGN

21.1.Khi nim v c im ca NGN

21.1.1.Khi nim

21.1.2.Cc c im ca NGN

41.2.Kin trc NGN

41.2.1.Kin trc chc nng ca NGN

51.2.2.Cu trc vt l

6Phn II Tng quan v cng ngh mng MAN Ethernet

72.1.Tng quan mng quang Ethernet

72.2.Cc tnh nng ca MAN Ethernet

82.3.Cu trc mng MAN E

92.4. M hnh phn lp mng MAN E

102.5.Cc im tham chiu trong mng MAN E

122.6. Cc thnh phn vt l trong mng MAN E

13Phn III Cc dch v c cung cp trn mng MAN E

133.1.M hnh dch v

143.2.Knh kt ni o Ethernet (EVC: Ethernet Vitual Connection)

163.3. Cc loi dch v trong mng MAN E

163.4. Dch v E Line

173.5.Dch v E Line

193.6.Dch v E Tree

20Phn IV Cac cng ngh ng dung cho mang MAN E

204.1.Thit bi SMC 1662

204.2.ng dung kt hp 3G

214.3.ng dung Ethernet trn SDH

214.4.ng dng lin kt SAN Interconnection

224.5.Cng ngh DWDM ca Cisco

234.6.Cng ngh RPR cua Huawei

LI NI U

Mng MAN-E l phn khc mng nm gia lp Core v lp Access, c t chc nng thu gom lu lng v m bo yu cu v cht lng dch v cho khch hng. Mng MAN-E chnh l yu t ct li cc nh cung cp dch v trin khai cung cp cc dch v bng rng cht lng cao i vi khch hng.Ti Vit Nam cng ngh mng MAN-E ang trong qu trnh trin khai do c rt nhiu vn cn nghin cu v pht trin tuy nhin trong lun vn ny xin c i vo Tm hiu cng ngh mng MAN-E v ng dng ca mng MAN-EPHN I TNG QUAN V QUANG NGN1.1. Khi nim v c im ca NGN

1.1.1. Khi nim

NGN l s tch hp mng PSTN da trn k thut TDM v mng chuyn mch gi da trn k thut IP/ATM. N c th truyn ti tt c cc dch v vn c ca PSTN, ng thi c th cung cp cho mng IP lu lng d liu ln, nh gim ti cho mng PSTN.

Tuy nhin, NGN khng ch n thun l s hi t gia thoi v d liu m cnl s hi t gia truyn dn quang v cng ngh gi, gia mng c nh v di ng.

Vn ct li y l lm sao c th tn dng ht li th em n t qu trnh hi tny. Mt vn quan trng khc l s bng n nhu cu ca ngi s dng cho mt khi lng ln dch v v ng dng phc tp bao gm c a phng tin, phn ln trong s khng c d tnh khi xy dng cc h thng mng truyn thng.

1.1.2. Cc c im ca NGN

NGN c bn c im chnh

- Nn tng l h thng m;

- Dch v thc hin c lp vi mng li;

- NGN l mng da trn nn chuyn mch gi, s dng cc giao thc thng

nht;

- L mng c dung lng ngy cng tng, c tnh thch ng cao, c dung

lng p ng nhu cu.

Trc ht, do p dng c cu m m:

Cc khi chc nng ca tng i truyn thng chia thnh cc phn t mng c lp, cc phn t c phn theo chc nng tng ng v pht trin mt cch c lp.

Giao din v giao thc gia cc b phn phi da trn cc tiu chun tng ng.

Vic phn tch chc nng lm cho mng vin thng truyn thng dn dn i

theo hng mi, nh kinh doanh c th cn c vo nhu cu dch v t t hp cc phn t khi t chc mng li. Vic tiu chun ha giao thc gia cc phn t c th thc hin lin kt gia cc mng c cu hnh khc nhau.

Tip n, vic tch dch v c lp vi mng nhm thc hin mt cch linh hot v c hiu qu vic cung cp dch v. Thu bao c th t b tr v xc nh c trng dch v ca mnh, khng quan tm n mng truyn ti dch v v loi hnh u cui.

iu lm cho vic cung cp dch v v ng dng c tnh linh hot cao hn.

Th ba, NGN da trn c s mng chuyn mch gi v cc giao thc thng

nht. Mng thng tin hin nay, d l mng vin thng, mng my tnh hay mng truyn hnh cp, u khng th ly mt trong cc mng lm nn tng xy dng c s h tng thng tin. Nhng my nm gn y, cng vi s pht trin ca cng ngh IP, ngi ta mi nhn thy r rng l mng vin thng, mng my tnh v mng truyn hnh cp cui cng ri cng tch hp trong mt mng IP thng nht, l xu th ln m ngi ta thng gi l dung hp ba mng. Giao thc IP lm cho cc dch v ly IP lm c s u c th thc hin lin kt cc mng khc nhau; con ngi ln u tin c c giao thc thng nht m ba mng ln u c th chp nhn c; t

c s vng chc v mt k thut cho h tng c s thng tin quc gia.

Giao thc IP thc t tr thnh giao thc ng dng vn nng v bt u c

s dng lm c s cho cc mng a dch v, mc d hin ti vn cn nhiu khuyt im v kh nng h tr lu lng thoi v cung cp cht lng dch v m bo cho s liu. Tuy nhin, chnh tc i mi nhanh chng trong th gii Internet, m n c to iu kin bi s pht trin ca cc tiu chun m s sm khc phc nhng thiu st ny.

1.2. Kin trc NGN

1.2.1. Kin trc chc nng ca NGN

T m hnh cu trc NGN v gii php ca cc hng khc nhau trn th trng hin nay, c th a ra m hnh cu trc NGN gm 4 lp chc nng nh sau

Hnh 1.1. Cu trc phn lp mng NGN

- Lp truy nhp v truyn dn;

- Lp truyn thng;

- Lp iu khin;

- Lp qun l.

Lp truyn dn v truy nhp

Phn truyn dn: p dng k thut ghp knh phn chia theo mt bc sng DWDM lp vt l nhm m bo cung cp cht lng dch v (QoS) theo yu cu ca ng dng.

Phn truy nhp: Hng ti s dng cng ngh quang cho thng tin hu tuyn v CDMA cho thng tin v tuyn. Thng nht s dng cng ngh IP.

Lp truyn thng

Thit b chnh trong lp truyn thng l cc cng (Gateway) lm nhim v kt ni gia cc phn ca mng v gia cc mng khc nhau.

Lp iu khin

Lp iu khin c nhim v iu khin kt ni gia cc u cui, vi yu cu tng thch vi tt c cc loi giao thc v bo hiu.

Lp iu khin c th c t chc theo kiu module, theo cc b iu khin c lp s thc hin cc chc nng iu khin khc nhau.

Thit b chnh trong lp iu khin l Softswitch (chuyn mch mm) lm nhim v bo hiu v iu khin cuc gi.

Lp qun l

Lp qun l l mt lp tc ng trc tip ln tt c cc lp cn li, lm nhim v gim st cc hot ng ca mng. Lp qun l phi m bo hot ng c trong mi trng m, vi nhiu giao thc, dch v v cc nh khai thc khc nhau.

Xt trn gc dch v, NGN cn c thm lp ng dng ngay pha trn lp iu khin, bao gm cc nt (server) cung cp cc dch v khc nhau. Lp ng dng lin kt vi lp iu khin thng qua giao din m API.

1.2.2. Cu trc vt l

NGN c hiu l mng th h sau hay mng th h k tip m khng phi l mng hon ton mi, nn khi xy dng v pht trin mng theo xu hng NGN, ngi ta ch n vn kt ni NGN vi mng truyn thng v tn dng cc thit b vinthng hin c trn mng nhm t c hiu qu khai thc ti a. Cc mng c kt ni ti mng li IP thng qua cc cng

Hnh 1.2. Cu trc vt l ca NGN

PHN II TNG QUAN V CNG NGH MANG MAN - E2.1. Tng quan mng quang Ethernet

Ngy nay cng ngh Ethernet pht trin v s dng rng ri trn th gii, t cc vn phng, c quan, n ngi dng c nhn. Vic cng ngh Ethernet c s dng rng ph bin v tnh d s dng, n nh cao, gi thnh r

Do nhu cu s dng ca khch hang ngy cng cao v s pht trin vt bc v mt cng ngh, tc ca Ethernet tang ln t vi Mbps ln ti vi chc Gbps. Do Ethernet phi chuyn dn t cp ng sang cp quang. Cng vi , cu trc b dng chung cng khng cn ph hp, v cu trc mng chuyn mch c s dng. vi nhng thay i ny, lm cho mng Ethernet tin cy cao, cht lng tt, m bo vic kt ni vi khch hang mi lc mi ni.

Xu hng pht trin ca cng ngh MAN E: hin ti cc cng ngh c dng xy dng mng MAN E th h mi ch yu tp trung vo 5 cng ngh:

- SDH/SONET th h mi

- WDM: ghp knh theo bc song

- RPR: vng Ring gi t phc hi

- Ethernet/Gigabit Ethernet

- Chuyn mch kt ni MPLS

2.2. Cc tnh nng ca MAN Ethernet

Khch hng c kt ni n MAN E s dng cc giao din thch hp vi Ethernet thay v tri qua nhiu bin i lu lng ATM, SONET/SDH v ngc li. Vi cc ny lm cho qu trnh cung cp n gin i rt nhiu. l m hnh Metro c hnh thnh t qu trnh cung cp cc ng bng thng.

Trong trng hp ny cc vn c n gin ha i rt nhiu cho c khch hng ln nh cung cp. Khch hng khng cn phi chia ct lu lng v nh tuyn chng n cc ng ph hp n ng c node ch, y ch cn to ra bng thng da theo SLA m bao hm c nhu cu ca khch hng ti mi node.

Vic cung cp cc kt ni khng cn l vn thit yu i vi nh cung cp mng na do h c iu kin tp trung vo vic to ta cc dch v gi tr gia tng. Bng vic m rng mng LAN v mng MAN E s dng kt ni bng thng ln hn, s khng cn s khc bit gia cc server ca mng vi cc router c t ti thit b ca khch hng v ti cc im POP ca nh cung cp mng na.

MAN E c chc nng thu gom lu lng v p ng nhu cu truyn ti lu lng cho cc thit b truy nhp( IPDSLAM, MSAN). C kh nng cung cp cc kt ni Ethernet ti khch hng truyn ti lu lng trong ni tnh, ng thi kt ni ln mng ng trc IP/MPLS chuyn lu lng i lin tnh hay quc t. Trong mng MAN E ngi ta s dng cc thit b CES (Carrier Ethernet Switch) ti cc ni c lu lng cao to thnh mng chuyn ti Ethernet/IP. Kt ni gia cc thit b CES dng hnh sao, ring hoc u ni tip, s dng cc loi cng kt ni n x 1Gbps hoc n x 10Gbps.

2.3. Cu trc mng MAN E

Kin trc mng Metro da trn cng ngh Ethernet in hnh c th m t nh hnh 1.1. Phn mng truy nhp Metro tp hp lu lng t cc khu vc (c quan, to nh, ...) trong khu vc ca mng Metro. M hnh in hnh thng c xy dng xung quanh cc vng Ring quang vi mi vng Ring truy nhp Metro gm t 5 n 10 node. Nhng vng Ring ny mang lu lng t cc khch hng khc nhau n cc im POP m cc im ny c kt ni vi nhau bng mng li Metro. Mt mng li Metro in hnh s bao ph c nhiu thnh ph hoc mt khu vc tp trung nhiu doanh nghip.

Hnh 2.1. Cu trc mng MAN E

2.4. M hnh phn lp mng MAN E

M hnh phn lp mng MAN E c nh ngha theo MEF 4 c chia lm 3 lp bao gm:

Lp truyn ti dch v (TRAN layer): bao gm mt hoc nhiu dch v truyn ti.

Lp dch v Ethernet (ETH layer): h tr cc dch v thng tin d liu Ethernet lp 2 trong m hnh OSI.

Lp dch v ng dng: h tr cc ng dng c truyn ti da trn dch v Ethernet lp 2.

M hnh phn lp mng MAN E da trn m hnh Client/Server. Hn na, mi lp c th bao gm cc thnh phn thuc mt phng qun l, gim st dch v.

Hnh 2.2. M hnh mng MAN E theo cc lp

Lp truyn ti dch v (Transport Servies Layer) : cung cp cc kt ni gia cc phn t ca lp dch v Ethernet. S dng nhiu cng ngh khc nhau thc hin vic h tr kt ni: IEEE 802.1, SONET/SDH, ATM VC, OTN ODUK, PDH DS1/E1, MPLS Cc cng ngh truyn ti trn, n lt mnh li c th do nhiu cng ngh khc h tr, c tip tc nh vy cho n lp vt l nh cp quang, cp ng, khng dy.

Lp dch v Ethernet (Ethernet Servies Layer): c chc nng truyn ti cc dch v hng kt ni chuyn mch da trn a ch MAC v cc bn tin Ethernet s c truyn trn h thng thng qua cc giao din hng ni b, hng bn ngoi c quy nh r rng, gn vi cc im tham chiu.

Lp dch v ng dng (Application Servies Layer): h tr cc dch v s dng truyn ti trn nn mng Ethernet ca mng MAN E. C nhiu dch v trong bao gm c cc vic s dng lp ETH nh mt lp TRAN cho cc lp khc nh IP, MPLS, PDH DS1/E12.5. Cc im tham chiu trong mng MAN E

im tham chiu trong mng MAN E l tp hp cc im tham chiu lp mng c s dng phn cc vng lin kt i qua cc giao din. Hnh 1.3 ch ra cc quan h gia cc thnh phn kin trc bn ngoi v mng MAN E. Cc thnh phn bn ngoi bao gm:

T cc thu bao n cc dch v MAN E.

T cc mng MAN E khc.

Cc mng truyn ti dch v khc.

Hnh 2.3. M hnh cc im tham chiu

Cc thu bao kt ni n mng MAN E thng qua im tham chiu giao din Ngi dung Mang. Cc thnh phn trong cng mng (NE: Internal Network Elements) hoc I-INNIs. Hai mng MAN E c lp c th kt ni vi nhau ti im tham chiu External NNI (E-NNI). Mt mng MAN E c th kt ni vi cc mng dch v v truyn ti khc ti im tham chiu lin mng Network Interworking NNI (NI-NNI).

Hnh 2.4. Giao din UNI v m hnh tham chiu MAN E

Giao din UNI s dng kt ni cc thu bao n nh cung cp dch v MAN E. UNI cng cung cp im tham chiu gia cc thit b mng MAN E thuc nh cung cp dch v v cc thit b truy nhp ca khch hang. V vy UNI bt u t im cui ca nh cung cp dch v v cc thit b truy nhp ca khch hng, giao din UNI pha nh cung cp dch v l im tham chiu UNI-N. Giao din pha khch hng l im tham chiu UNI-C. Phn bit gia UNI-N v UNI-C l im tham chiu T. Trong phn cc thit b khch hng thng c chia thnh thit b truy nhp v thit b ngi s dng u cui. Gia hai thit b ny c im tham chiu S[6].

2.6. Cc thnh phn vt l trong mng MAN E

Cc thit b vt l trong mng l cc thnh phn mng trong mng MAN E. Mt thit b c th c nhiu chc nng khc nhau v thuc nhiu lp khc nhau trong m hnh mng MAN E.

Cc thit b bin khch hng (CE: Customes Edge): l thnh phn vt l thuc kin trc mng MAN E thc hin cc thnh phn chc nng thuc mng khch hang yu cu cc dch vuh t nh cung cp mng MAN E. Cc thnh phm chc nng ring l ca m CE c th hon ton thuc pha khch hng hoc hon ton thuc pha nh cung cp dch v. Mt thit b CE ti thiu phi p ng c kh nng lm vic vi giao din UNI-C. Thit b CE c th l Switch hoc mt thit b u cui.

Thit b bin nh cung cp dch v (PE: Provider Edge): l cc router c chc nng cung cp chc nng kt ni n khch hng hoc kt ni n mng ngoi khc thuc lp ETH.

Thit b li ca nh cung cp dch v (P: Provider Core): l cc router khc ca nh cung cp dch v thuc lp ETH layer, chng khng tham gia vo cc chc nng thuc giao din UNI-N/E-NNI.

Thit b kt cui mng (NT: Network Termination): thc hin chc nng thuc lp TRAN layer gia im cui ca nh cung cp dch v v im u ca khch hng. Cc thit b ny thc hin chc nng gim st hiu nng ng truyn vt l, nh thi, chuyn i m ha gia cc thnh phn.

Thit b bin truyn ti (TE: Transport Edge): cho php ghp knh cc lung d liu ca nhiu khch hng vo cng mt ng truyn vt l.

PHN III CAC DICH VU C CUNG CP TRN MANG MAN3.1. M hnh dch v

M hnh dch v Ethernet l m hnh chung cho cc dch v Ethernet, c xy dng trn c s s dng cc thit b ca khch hng truy cp cc dch v. Trong m hnh ny s nh ngha cc thnh phn c bn cu thnh dch v cng nh mt s c tnh c bn cho mi loi dch v.

Hnh 3.1. M hnh cung cp cc dch v Ethernet

Cc dch v Ethernet c cung cp bi nh cung cp mng Ethernet Metro. Thit b khch hang ni n mng ti giao din ngi dng mng (UNI) s dng mt giao din chun 10Mbps, 100Mbps, 1Gbps hoc 10Gbps.

Trong m hnh ny ch yu cp n cc kt ni mng m trong thu bao c xem l mt pha ca kt ni khi trnh by v cc ng dng thu bao. Tuy nhin cng c th c nhiu thu bao kt ni n mng MEN t cng mt v tr.

Trn c s cc dch v chung c xc nh trong m hnh, nh cung cp dch v c th trin khai cc dch v c th theo nhu cu khch hng. Nhng dch v ny c th truyn qua cc mi trng v cc giao thc khc nhau trong mng MAN E nh SONET, DWDM, MPLS, GFP Tuy nhin, xt t gc khch hng th cc kt ni mng xut pht t pha khch hng ca giao din UNI l cc kt ni Ethernet.

3.2. Knh kt ni o Ethernet (EVC: Ethernet Vitual Connection)

Mt thnh phn c bn ca mng MAN E l knh kt ni o Ethernet. Mt EVC l mt knh kt ni gia hai hoc nhiu giao din UNI. Cc giao din UNI ny c gi l cc giao din UNI thuoock knh EVC. Mt giao din UNI c th thuc mt hay nhiu knh EVC ty thuc vo s ghp knh trn dch v. Mi khung dch v i vo mng MAN E phi n mt EVC no , giao din UNI m khung dch v i n vo MAN E gi l UNI u vo. Khung dch v i vo khung EVC s c truyn n mt giao din UNI khc thuc knh EVC v khng th truyn n giaod din UNI khng thuc knh EVC. Mi knh EVC lun cho php truyn theo hai hng.

C hai loi knh EVC l EVC im im v EVC a im:

EVC im im: l knh EVC kt ni hai giao din UNI vi nhau. Khung dch v i vo giao din UNI ny ch c th i ra giao din UNI kia v ngc li.

Hnh 3.2. EVC im - im

Knh EVC a im: l knh EVC kt ni t hai giao din UNI tr ln vi nhau. Knh EVC a im c hai giao din UNI khc vi knh dim im ch c th them vo mt hoc nhiu giao din UNI khc. C hai loi knh EVC a im l knh EVC a im a im v knh EVC dng cy.

- EVC a im a im, cc giao din UNI kt ni bnh ng vi nhau. Mi khung dch v c th c c truyn trc tip t UNI ny n bt k mt UNI no khc cung thuc vo knh EVC.

Hnh 3.3. EVC im a im

- EVC dng cy, c mt s giao din UNI c xem l gc v cc giao din UNI cn li l l. Gi tin t giao din UNI gc c th truyn trc tip n tt c cc giao din khc cng thuc knh EVC. Vi cc giao din UNI l, nu mun truyn mt giao din UNI khc phi truyn qua giao din gc.

Hnh 3.4. EVC dng cy

3.3. Cc loi dch v trong mng MAN E

Vi h thng Metro cc nh cung cp dch v bt u s dng cng ngh kt ni Ethernet cung cp cc dch v. Da vo giao thc Ethernet 802.3 ca IEEE, cng thm cc tham s v dch v to nn cc dch v Ethernet.

MAN E c cc dch v c bn: dch v Ethernet Line (E - Line), Ethernet LAN (E - LAN) v Ethernet Tree (E - Tree). Da vo cc dch v c bn ny, cc nh cung cp dch v c th a ra nhiu loi hnh dch v khc nhau cho khch hng.

3.4 . Dch v E Line

Dch v knh Ethernet cung cp kt ni o Ethernet dim im (EVC) gia hai UNI nh hnh di. Dch v E Line c s dng cho kt ni im im.

Hnh 3.5. Dch v E Line

Dch v E Line c th cung cp bng thong i xng cho truyn s liu theo hai hng. dng phc tp hn n c th to ra tc thong tin tt nht (CIR) v kch thc khi tt nht (CBS).

Ti mi UNI c th thc hin ghp dch v t mt s EVC khc nhau. Mt s EVC im im c th c cung cp trn cng mt cng vt l ti mt trong cc giao din UNI trn mng.

Mt dch v E Line c th cung cp mt kt ni im im gia cc UNI tng t s dng cc chuyn tip khung PVC kt ni cc bn vi nhau.

Mt dch v E Line c th cung cp mt kt ni im im gia cc UNI tng t nhau n mt dch v ring TDM. y l dch v kt ni gia hai UNI v to ra cc khung dch v hon ton trong sut gia cc UNI.

Nhn chung dch v E Line c th c s dng xy dng cc dch v tng t cho chuyn tip khung hoc cc ng thu ring.

3.5. Dch v E Line

Dch v ny cung cp cc kt ni a im, chng hn c th kt ni mt s UNI vi nhau nh hnh v sau.

Hnh 3.6. Dch v E LAN

S liu thu bao gi t mt UNI c th c nhn ti mt hoc nhiu UNI khc. Mi UNI c kt ni n mt EVC a im. khi c cc UNI thm vo, chng c kt ni n cng EVC a im do n gin ha qu trnh cung cp v kch hot dch v.

Dch v E LAN c th c s dng kt ni ch hai UNI. Vi dch v E Line khi mt UNI c thm vo, mt EVC cng phi c b sung kt ni UNI mi n mt trong cc UNI tn ti. Hnh 11 minh ha khi mt UNI c thm vo v s c mt EVC mi c b sung tt c cc UNI c th kt ni c vi nhau khi dung dch v E Line.

Hnh 3.7. Qu trnh thm mt UNI vo mng MAN E

Vi dch v E LAN, khi UNI mi cn thm vo EVC a im th khng cn b sung EVC mi v dch v E LAN s dng EVC a im a im. Dch v ny cng cho php UNI mi trao i thong tin vi tt c cc UNI khc trn mng. Trong khi vi dch v E Line th cn c cc EVC n tt c cc UNI. Do , dch v E LAN ch yu cu mt EVC thc hin kt ni nhiu bn vi nhau.

3.6. Dch v E Tree

E Tree l dch v kt ni dng cy. Cc kt ni ny da vo knh EVC dng cy. Mi cy u c mt hoc nhiu gc. Trng hp n gin nht l c mt gc.

Hnh 3.8. Dch v E Tree

Vi kiu dch v E Tree mt giao din UNI l ch truyn d liu thng qua giao din UNI gc m khng truyn trc tip n cc giao din UNI l khc c. Giao din UNI gc c th truyn trc tip n tt c cc l. Dch v E Tree thng c ng dng cho cc khch hng doanh nghieepk c nhu cu kt ni im a im gia trung tm v cc chi nhnh. Cc chi nhnh ch c kt ni v trung tm, khng kt ni trc tip gia cc chi nhnh.

Vi kiu dch v E Tree nhiu gc, c nhiu giao din UNI c chn l UNI gc. Cc UNI gc ny c th truyn d liu sang nhau v sang cc UNI l.

Hnh 3.9. Dch v E Tree nhiu gc

Trong nhiu trng hp cc giao din UNI gc c cu hnh d phng. Khi UNI ny b li th vic chuyn tip d liu s do UNI d phng m nhim.

Vi dch v E Tree c th phn thnh hai loi dch v l Ethernet Private Tree (EP - Tree) v Ethernet Vitual Pravite (EVP - Tree). Dch v EP Tree da trn giao din vt l do khch hng c th qun l cc VLAN ca mnh m khng cn thng bo hay can thip ca nh cung cp dch v. EP Tree thng dng cho cc khch hng qun l tp trung hoc phn phi thng tin ti mt hoc nhiu im khc nhau.

PHN IV CAC CNG NGH NG DUNG CHO MANG MAN - EHai ng dng quan trng nht trong cng ngh DWDM cho MAN l SANs v SONET/SDH.

4.6. Cng ngh RPR cua HuaweiVic s dng cng ngh RPR ca Huawei trin khai MAN quy m ln c ng dng rng ri trong ngnh cng nghip.

Hinh 4.5. RPR c ng dung trong trin khai MANL mt thnh vin ca lin minh RPR, Huawei tham gia tch cc trong vic thnh lp v tho lun v tiu chun RPR. Vi kh nng ca mnh, Huawei p ng tt cc sn phm RPR trong lp truy cp, lp hi t v lp li.

Ngoi ra, n cn h tr cho cc lp vt l Ethernet v SONET/SDH c sn. Cng ngh ny cng h tr trn thit b giao thng vn ti, thit b nh tuyn, chuyn mch v nhng thit b khc. Tc truyn ti cho h thng ln n 622M ~ 10G.KT LUN VA LI CAM N Qua thi gian thc tp thc t c tm hiu v Cng ngh mang MAN E va cac ng dung ang c s dng rng ri trong khp c nc em thy c s pht trin nhanh chng ca nc ta trong lnh vc Vin thng. Mng li Vin thng v ang m rng trn khp c nc vi nhiu nhng dch v tin ch v trang thit b hin i. N p ng c nhng nhu cu ca khch hng trong vic s dng dch v Vin thng. Trong tng lai y vn s l ngnh mi nhn i u trong c nc.

Trong thi gian hc ti trng Hc vin cng ngh Bu chnh Vin thng H Ni em c trang b nhng kin thc v ngnh in T Vin Thng qua cc mn hc c s .Chuyn ngnh v cc bi thc hnh b mn. Mt thng thc tp l thi gian em tm hiu thc t, p dng nhng kin thc hc c ti nh trng vo cng vic, ng thi cng l c hi em tch lu nhng kinh nghim cho cng vic sau ny.

Trn y l ton b bo co thc tp ca em trong thi gian t 6 tun. Mc d c gng, nhng do kin thc cn hn ch nn bo co thc tp khng trnh khi nhng thiu st, em rt mong nhn c s gp t thy c v cc bn bo co c hon thin hn.

Trong thi gian thc tp em nhn c s gip tn tnh ca ban gim c cng nh cc anh ch trong cng ty. t c kt qu nh ngy hm nay em cng khng qun cm n s gip ca cc thy c trong khoa in t vin thng. c bit em gi li cm n su sc n thy Bi Hng Thun tn tnh hng dn em trong sut qu trnh thc tp v hon thnh bo co nyEm xin chn thanh cam n PAGE 28SV Ha Tun Vinh Lp C09 VT2