gpon va cung cap dich vu cho vnpt ha noi

8/12/2019 GPON Va Cung Cap Dich Vu Cho VNPT Ha Noi

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HC VIN CNG NGHBU CHNH VIN THNG

----------------------------------------

Lu Thanh Huy

NGHIN CU CNG NGHMNG QUANG THNGG PON V XUT CC DCH VCUNG CP TIKHCH HNG TRN MNG G PON VNPT H NI

Chuyn ngnh: Kthut in t

M s: 60.52.70

Ngi hng dn khoa hc: TS VTUN LM

TM TT LUN VN THC S

H NI - 2012


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LI NI U

Trong nhng nm gn y, cc dch vng dng trn

Internet ngy cng phong ph v pht trin vi tc nhanh

chng nh cc dch v mua bn trc tuyn, ngn hng, cc

dch vo to txa, game trc tuyn, truyn hnh theo yu

cu, dch v lu trd liu txa c bit nhu cu vcc

loi dch v gia tng tch hp thoi, hnh nh v dliu angngy cng tng. Spht trin ca cc loi hnh dch vmi,

i hi htng mng truy nhp phi p ng cc yu cu v

bng thng rng, tc truy nhp cao. H tng mng truy

nhp cp ng sdng cng nghxDSL gp phi nhng hn

ch vc ly v tc khng p ng c yu cu dch

v.

VNPT v cthl VNPT H Ni trong nhng nm gn

y pht trin rt mnh mng cp quang FTTx p ng

nhu cu sdng. Doanh thu t c tcc dch vbng rng

s dng cp quang hin nay ngy cng cao v dn chim t

trng ch yu. Tuy nhin hin nay, vic pht trin mng cp

quang thu bao FTTx ng ngha vi vic phi thi cng rt

nhiu tuyn cp quang dung lng ln. Vi c shtng ca

TP H Ni nh hin nay th vic thi cng cp quang ngy cng

kh khn do h tng cng bbu in ngm ht dung

lng, vic mrng rt kh khn do phi xin php o ng,

vic ko treo cp quang l khng thc hin c do c quy


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nghin cu tm hiu nhng c im kthut c bn ca cng

nghGPON, phn tch hin trng mng G-PON ca VNPT H

Ni bao gm cu hnh mng, chng loi, tnh nng, khnng

p ng ca thit bc sdng trn mng G-PON, nhu cu

sdng dch vca thu bao, hiu qukinh doanh v trn c

s xut cc dch vc trin khai cung cp ti khch

hng trn mng quang G-PON ca VNPT H Ni.

Cu trc lun vn bao gm:

Chng 1: Tng quan vmng G - PON

Chng 2: Gii php cng nghmng G-PON

Chng 3:Phn tch, xut cc dch vcung cp ti

khch hng trn mng G PON VNPT H Ni


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CHNG 1.Tng quan vmngG PON1.1. Mu

Hin nay trn th gii hn 2 t ngi ang s dngdch v internet v ti cc nc pht trin v ang pht trin.

Thu bao bng rng (hu tuyn) tng trng mnh, trong

c Vit Nam. Theo Tng cc Thng k, s thu bao Internet

bng rng trn cnc tnh n cui thng 11/2011 c tnh

t 4,2 triu thu bao, tng 16,3% so vi cng thi im

nm trc v hin vn tng trng u n.

Vi spht trin, bng nca cc dch v trc tuyn

nh trong lnh vc ngn hng, gii tr, gio dc,.. c th ni

internet bng rng l nhu cu tt yu ca x hi pht trin

ngy nay.

Mng vin thng thng c cu thnh bi ba mng

chnh: mng ng trc, mng pha khch hng v mng truy

nhp. Trong nhng nm gn y, mng ng trc c nhng

bc pht trin nhy vt do s xut hin ca cc cng ngh

mi, nh cng nghghp knh theobc sng (WDM). Mng

ni ht (LAN) hin cng t n tc 1Gb/s, thm ch ccsn phm Ethernet 10 Gb/s cng c cung cp trn th

trng. iu ny dn n mt s chnh lch rt ln v

bng thng gia mt bn l mng LAN tc cao v mng

ng trc v mt bn l mng truy nhp tc thp, m

chng ta vn thng gi l nt c chai (bottleneck) trong

mng vin thng. Vic bng nlu lng Internet trong thi


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gian va qua cng lm trm trng thm cc vn ca mng

truy nhp tc thp. Lu lng dliu ngy cng tng mnh

khi slng ngi sdng dch vtrc tuyn ngy cng gia

tng. Xu hng ny vn scn tip tc trong tng lai, tc l

cng ngy s cng c nhiu ngi s dng trc tuyn v

nhng ngi sdng trc tuyn th thi gian trc tuyn s

cng nhiu hn, do vy nhu cu vbng thng li cng tng

ln. ng trc tnh hnh , mt scng nghmi c

a ra nhm p ng nhng i hi vbng tn.Mng quang th ng (PON) c th nh ngha mt

cch ngn gn nh sau: Mng quang thng (PON) l mt

mng quang khng c cc phn tin hay cc thit bquang

in t.

Vi khi nim ny, mng PON s khng cha bt kmt phn ttch cc no m cn phi c schuyn i in -

quang. Thay vo , PON schbao gm: si quang, cc b

chia, b kt hp, b ghp nh hng, thu knh, b lc,...

iu ny gip cho PON c mt su im nh: khng cn

ngun in cung cp nn khng bnh hng bi li ngun,

c tin cy cao v khng cn phi bo dng do tn hiukhng bsuy hao nhiu nh i vi cc phn ttch cc.

Mng PON ngoi vic gii quyt cc vn vbng

thng, n cn c u im l chi ph lp t thp do n tn

dng c nhng si quang trong mng c ttrc. PON

cng d dng v thun tin trong vic ghp thm cc ONU


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theo yu cu ca cc dch v, trong khi vic thit lp thm

cc nt trong mng tch cc kh phc tp do vic cp ngun

ti mi nt mng, v trong mi nt mng u cn c cc b

pht li.

PON c th hot ng vi ch khng i xng.

Chng hn, mt mng PON c th truyn dn theo lung OC-

12 (622 Mbits/s) ng xung v truy nhp theo lung OC-

3 (155 Mbits/s) ng ln. Mt mng khng i xng nh

vy s gip cho chi ph ca cc ONU gim i rt nhiu, do chphi s dng cc b thu pht gi thnh thp hn.

PON cn c kh nng chng li cao (cao hn

SONET/SDH). Do cc nt ca mng PON nm bn ngoi

mng, nn tn hao nng lng trn cc nt ny khng gy nh

hng g n cc nt khc. Kh nng mt nt mt nng lngm khng lm ngt mng l rt quan trng i vi mng truy

nhp, do cc nh cung cp khng th m bo c nng

lng d phng cho tt c cc u cui xa.

Vi nhng l do nh trn, cng nghPON c thc

coi l mt gii php hng u cho mng truy nhp. PON cng

cho php tng thch vi cc giao din SONET/SDH v cthc s dng nh mt vng thu quang thay th cho cc

tuyn truyn dn ngn trong mng th hay mch vng

SONET/SDH ng trc.

1.2. Kin trc mng PON


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Cc phn tthng ca PON u nm trong mng phn

bquang (hay cn gi l mng ngoi vi) bao gm cc phn t

nh si quang, cc btch/ghp quang thng (spliter), cc

u ni v cc mi hn quang. Cc phn ttch cc nh OLT

v cc ONU u nm u cui ca PON. Tn hiu trong

PON c thc phn ra v truyn i theo nhiu si quang

hoc c kt hp li v truyn trn mt si quang thng qua

bghp quang, phthuc vo tn hiu l i theo hng ln

hay hng xung ca PON. PON thng c trin khai trnsi quang n mode, vi cu hnh cy l phbin. PON cng

c th c trin khai theo cu hnh vng ring cho cc khu

thng mi hoc theo cu hnh bus khi trin khai trong cc

khu trng s,...

M hnh mng quang th ng

Bng cch sdng cc b tch/ghp quang, PON c th

trin khai theo bt c cu hnh no trong cc cu hnh trn.

Ngoi ra, PON cn c ththu gn li thnh cc vng ring kp,

hay hnh cy, hay mt nhnh ca cy. Tt ccc tuyn truyn

dn trong PON u c thc hin gia OLT v ONU. OLT

Mng quang

Mng v tuyn

Mng IP

Mng ATM

Hthng qun l

EMS


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nm CO v kt ni mng truy nhp quang vi mng th

(MAN) hay mng din rng (WAN), c bit n nh l

nhng mng ng trc. ONU nm ti vtr u cui ngi s

dng (FTTH hay FTTB hoc FTTC).

Cc kiu kin trc ca PON.

1.3. Cc hthng PON ang c trin khai1.3.1. APON/BPONFSAN pht trin mt tiu ch cho mng truy nhp PON s

dng cng nghATM v giao thc lp 2 ca n. Hthng ny

c gi l APON (vit tt ca ATM PON). Ci tn APON

sau c thay th bng BPON vi din t PON bngrng. H thng BPON c kh nng cung cp nhiu dch v

bng rng nh Ethernet, Video, ng ring o (VPL), knh

thu ring, v.v Nm 1997 nhm FSAN a cc xut ch

tiu BPON ln ITU-T thng qua chnh thc. T, cc tiu

chun ITU G.983.x cho mng BPON ln lt c thng qua


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H thng BPON h tr tc khng i xng 155 Mbps

hng ln v 622 Mbps hng xung hoc tc i xng

622 Mbps. Cc h thng BPON c s dng nhiu

nhiu ni, tp trung Bc M, Nht Bn v mt phn Chu

u.

1.3.2. GPONDo c tnh cu trc ca BPON kh c thnng cp ln tc

cao hn 622 Mbps v mng PON trn csnn ATM khng

ti u i vi lu lng IP, nhm FSAN pht trin mt hthng mng PON mi tnm 2001 vi tc 1Gbps htrc

lu lng ATM v IP. Da trn cc khuyn nghca FSAN,

t nm 2003-2004, ITU-T chun ha mt lot cc tiu

chun cho mng PON Gigabit (GPON) bao gm

G.984.1,G.984.2 v G.984.3.

1.3.3. EPONEthernet PON (EPON) l mng trn c s PON mang lu

lng d liu gi trong cc khung Ethernet c chun ha

theo IEEE 802.3, hot ng vi tc 1Gbps.

1.3.4.

WDM-PONCng ngh mng quang th ng s dng ghp knh phn

chia theo bc sng Wavelength Division Multiplexing

Passive Optical Network (WDM PON) l th h k tip ca

mng truy nhp quang v cho bng thng ln nht. TDMPON

(bao gm BPON, GPON v GEPON) s dng cc b chia

cng sut quang thng, hng xung l qung b v ONU


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nhn d liu ca mnh thng qua nhn a ch nhng, hng

ln s dng ghp knh trong min thi gian. WDMPON s

dng cc b ghp sng WDM th ng, hng xung mi

ONU nhn d liu trn mt bc sng, hng ln cc bc

sng khc nhau c ghp thng qua bghp sng WDM ti

ONU. Do s dng mt bc sng cho mi ONU nn

WDMPON c tnh bo mt v tnh mm do tt hn. Cng

ngh WDMPON s l s la chn ca tng lai v l bc

pht trin k tip cho cc cng ngh mng truy nhp quangPON.

1.3.5. Nhn xtHin nay mng APON/BPON khng c quan tm pht trin

do chhtrdch vATM v tc truy nhp thp hn nhiu

so vi cc cng nghhin hu khc nh GPON hay EPON.

EPON ch cung cp tc truyn l 1,25 Gbit/s trong khi

GPON li cho php t ti tc 2.448 Gbit/s. Vi hiu sut

t 50% 70%, bng thng ca GEPON b gii hn trong

khong 600Mbps n 900Mbps, trong khi GPON vi vic

tn dng bng thng ti a n c thcho php cc nh cung

cp dch vphn phi vi bng thng ln n 2300 Mbps vihiu sut mng c tht ti 93%.

Hiu sut ln, rng bng tn ln, GPON ha hn mang li

nhiu li nhun cho cc nh cung cp dch v. Bn cnh

trong khi EPON chhtrduy nht mt tc truyn dn i

xng 1,25/1,25 Gbps. GPON linh hot v bin i c hn


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nhiu hn, cho php cc tc hng xung 1,25 v 2,5

Gbps, hng ln cho php 155 Mbps, 622 Mbps hay 1,25 v

2,5 Gbps.

Tnhng so snh trn c ththy rng GPON thch hp hn

so vi EPON trong vic lp t cc h thng mng cung

cp cc kh nng d phng cn thit h tr cho O&M, kh

nng tng thch cng nh l bo mt. y l nhng iu kin

cn thit iu hnh mt mng kch cln.

1.4. Kt lunPON l mng truy nhp c nhiu u im trin khai cc

dch vbng rng (thoi, d liu, video) gia cc khi kt

cui ng dy xa (ONUs) v kt cui mng (OLT). Khng

nh mng quang tch cc AON, chng hn nh mng

SONET/SDH, cn cc bchuyn i quang in ti mi nt,

mng quang thng PON s dng cc b tch/ghp quang

thng phn blu lng quang. Mt mng PON c th

tp trung lu lng t64 ONU n mt OLT c t tng

i trung tm (CO) theo kin trc hnh cy, bus, hoc vng

ring chng li.Ging nh mng SONET/SDH, PON l cng nghtruyn ti

ca lp mt. T trc n nay, hu ht cc vng ring quang

trong mng vin thng u s dng cc thit b truyn dn

SONET/SDH. Cc vng ring ny u sdng cc bpht li

ti mi nt, vi khong cch gia cc nt c ti u ho

cho mng ng trc hay mng th. Tuy nhin, y khng


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phi l sla chn tt nht cho mng truy nhp ni ht. Mng

PON ngoi vic gii quyt cc vn vbng thng, n cn

c u im l chi ph lp t thp do n tn dng c nhng

si quang trong mng c t trc. PON cng ddng v

thun tin trong vic ghp thm cc ONU theo yu cu ca

cc dch v, trong khi vic thit lp thm cc nt trong

mng tch cc kh phc tp do vic cp ngun ti mi nt

mng, v trong mi nt mng u cn c cc bpht li.

Khng ging nh trong mng tch cc SONET/SDH, PON cth hot ng vi ch khng i xng. Chng hn, mt

mng PON c thtruyn dn theo lung OC-12 (622 Mbits/s)

ng xung v truy nhp theo lung OC-3 (155 Mbits/s)

ng ln. Mt mng khng i xng nh vy sgip cho chi

ph ca cc ONU gim i rt nhiu, do chphi sdng cc b

thu pht gi thnh thp hn. Cn i vi mng SONET/SDH

l i xng, do trong vng ring OC-12, tt ccc card ni

vi cc ADM u phi c giao din OC-12.

Ngoi ra, mt gc no PON cn c kh nng

chng li cao hn SONET/SDH. Do cc nt ca mng PON

nm bn ngoi mng, nn tn hao nng lng trn cc ntny khng gy nh hng g n cc nt khc. iu ny l

khng thi vi mng SONET/SDH, do qu trnh pht li

mi nt mng. Khnng mt nt mt nng lng m khng

lm ngt mng l rt quan trng i vi mng truy nhp, do

cc nh cung cp khng th m bo c nng lng d

phng cho tt ccc u cui xa.


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Vi nhng l do nh trn, cng ngh PON c coi l mt

gii php y ha hn gii quyt vn tc nghn bng

thng trong mng truy nhp, cho php trin khai cc dch v

bng rng v c tnh tng tc. Trong thi gian ngn trc

mt, ng dng ca cng nghPON c thl nh cung cp cho

cc cng ty in thoi, mng cp TV, v cho cc nh cung cp

dch vmng v tuyn. Vi vic a ra mt gii php vi gi

thnh h, bng tn cao, c kh nng chng li, cng ngh

PON s l gii php tt nht cho mng thh sau, cng nhcho mng truy nhp bng rng.


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CHNG 2.Gii php cng nghmng G PON2.1. Gii thiu chungGPON (Gigabit Passive Optical Network) c nh nghatheo chun ITU-T G.984. Phng thc ng gi GPON -

GEM (GPON Encapsulation Method) cho php ng gi lu

lng ngi dng rt hiu qu, vi sphn on khung cho

php cht lng dch v QoS (Quality of Service) cao hn

phc v lu lng nhy cm nh truyn thoi v video.

GPON htrtc cao hn, tng cng bo mt, iu chophp GPON phn phi thm cc dch v ti nhiu thu bao

hn vi chi ph thp hn cng nh cho php khnng tng

thch ln hn gia cc nh cung cp thit b.

2.2. Chun ha GPONGPON c ITU-T chun ha theo chun G.984 bt u tnm 2003, mrng tchun BPON G.983.

ITU-T G.984.1 ( 03/2003) G-PON: General characteristics:

cung cp cc giao din mng ngi dng (UNI), giao din nt

dch v(SNI) v mt sdch v. Chun ny ktha hthng

G.982 (APON) v G.983.x (BPON) bng vic xem xt li dchvhtr, chnh sch bo mt, tc bit danh nh.

ITU-T G.984.2 (03/2003) G-PON: PMD layer specification:

ch ra cc yu cu cho lp vt l v cc chi tit k thut cho

lp PMD. N bao gm cc h thng c tc hng xung

1244.160 Mbit/s, 2488.320 Mbit/s v hng ln 155.520


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Mbit/s, 622.080 Mbit/s, 1244.160 Mbit/s, 2488.320 Mbit/s.

M tchthng GPON i xng v bt i xng.

ITU-T G.984.2 Adm 1 (02/2006): thm ph lc cho ITU-TG.984.2, cc xc minh v khnng chp nhn gi thnh sn

xut cng nghip i vi hthng G-PON 2.488/1.244 Gbit/s

ITU-T G.984.3 (02/2004) G-PON: TC layer specification:

m tlp hi ttruyn dn (Transmission convergence TC)

cho cc mng G-PON bao gm nh dng khung, phng thciu khin truy nhp mi trng, phng thc ranging, chc

nng OAM v bo mt.

ITU-T G.984.3 Adm1 (07/2005): ci tin chtiu kthut lp

TC, sa i hiu chnh vtngG.984.3.

ITU-T G.984.3 Adm2 (03/2006): thm thng tin phn phlcITU-T G.984.3 cho phn kthut v nh dng tn hiu hng

xung.

ITU-T G.984.3 Adm3 (12/2006): sng tv c ng ni dung

ITU-T G.984.3.

ITU-T G.984.4 (06/2004) G-PON: ONT management and

control interface specification: cung cp ch tiu k thut

giao din iu khin (OMCI) v qun l ONT cc h thng

GPON

ITU-T G.984.4 Adm1 (06/2005): sa i b sung ITU-T

G.984.4.


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ITU-T G.984.4 Adm2 (03/2006) : sa i b sung ITU-T

G.984.4.

ITU-T G.984.4 Adm3 (03/2006): lm r ngha cho phn G-OMCI, m t cc mc cnh bo, gii hn tc cc cng

Ethernet, OMCI cho OMCI, vn chuyn lu lng

pseudowire.

2.3. Kin trc GPONH thng G-PON bao gm OLT, cc ONU, mt bchia

quang v cc si quang. Si quang c kt ni ti cc nhnh

OLT ti bchia quang ra 64 si khc v cc si phn nhnh

c kt ni ti ONU.

OLT (Optical Line Terminal): thit b kt cui cpquang tch cc lp t ti pha nh cung cp dch v

thng c t ti cc i trm.

ONT (Optical Network Terminal): thit b kt cuimng cp quang tch cc, kt ni OLT thng qua mng


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phn phi quang (ODN) dng cho trng hp cung cp

kt ni quang ti nh thu bao (FTTH)

ONU (Optical Network Unit): thit b kt cui mngcp quang tch cc, kt ni vi OLT thng qua mng

phn phi quang (ODN) thng dng cho trng hp

kt ni ti buiding hoc ti cc va h, cabin (FTTB,

FTTC, FTTCab)

B tch/ghp quang th ng (Splitter): Dng chia/ghp thng tn hiu quang tnh cung cp dch

v n khch hng v ngc li, gip tn dng hiu

qu si quang vt l. Splitter thng c t ti cc

im phn phi quang (DP) v cc im truy nhp

quang (AP). B tch/ghp quang c t ti cc cc

thp kiu indoor thng t ti nh trm vin thng),

t trong cc thp outdoor (trn va h, ngoi ng)

hoc trong cc mng xng.

FDC - Fiber Distribution Cabinet: Tphn phi quang FDB - Fiber Distribution Box: Hp phn phi quang

loi nh.

2.3.1 Kt cui ng quang OLTOLT bao gm ba phn chnh:

Giao din mng phn tn quang (PON core shell) Chc nng kt ni cho (Cross-connect shell) Chc nng giao din cng dch v(Service shell)


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Cc khi OLT chnh c m ttrong hnh sau:

Cc khi chc nng ca OLT

2.3.2 Khi mng quang ONUCc khi chc nng ca GPON ONU hu ht u ging

nh ca OLT. V ONU hot ng chvi mt giao din PON

n (hoc nhiu nht l hai giao din vi mc ch bo v),

chc nng kt ni cho c th b bi. Tuy nhin, thay cho

chc nng ny, chc nng dch vMUX v DEMUX c h

trxl lu lng.

2.3.3 Mng phn phi quang ODNMng phn phi quang kt ni gia mt OLT vi mt

hoc nhiu ONU s dng thit b tch/ghp quang v mng

cp quang thu bao.

2.4. Thng s k thutCc thng skthut c bn ca mng GPON:

Tc truyn dn:

0,15552 Gbps ng ln; 1,24416 Gbps ng xung. 0,62208 Gbps ng ln; 1,24416 Gbps ng xung. 1,24416 Gbps ng ln; 1,24416 Gbps ng xung.


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0,15552 Gbps ng ln; 2,48832 Gbps ng xung. 0,62208 Gbps ng ln; 2,48832 Gbps ng xung. 1,24416 Gbps ng ln; 2,48832 Gbps ng xung. 2,48832 Gbps ng ln; 2,48832 Gbps ng xung.

Cc thng s k thut khc:

Bc sng: 1260-1360nm ng ln; 1480-1500nmng xung

a truy nhp hng ln: TDMA Cp pht bng thng ng DBA (Dynamic Bandwith

Allocation)

Loi lu lng: d liu s Khung truyn dn: GEM Dch v: dch v y (Ethernet, TDM, POTS) T l chia ca b chia th ng: ti a 1:128 Gi tr BER ln nht: 10-12 Phm vi cng sut s dng lung xung: -3 n +2 dBm

(10km ODN) hoc +2 n +7 (20Km ODN)

Phm vi cng sut s dng lung ln: -1 n +4 dBm(10Km v 20Km ODN)

Loi cp: tiu chun ITU-T Rec. G.652 Suy hao ti a gia cc ONU:15dB C ly cp ti a: 20Km vi DFB laser lung ln, 10Km

vi Fabry-Perot


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2.5. K thut truy nhp v phng thc ghp knh2.5.1. K thut truy nhpKthut truy nhp c sdng phbin trong cc hthng

GPON hin nay l a truy nhp phn chia theo thi gian

(TDMA).

TDMA l kthut phn chia bng tn truyn dn thnh nhng

khe thi gian k tip nhau. Nhng khe thi gian ny c th

c n nh trc cho mi khch hng hoc c thphn theo

yu cu tuthuc vo phng thc chuyn giao ang sdng.Mi thu bao c php gi sliu ng ln trong khe thi

gian ring bit. B tch knh sp xp s liu n theo v tr

khe thi gian ca n hoc thng tin c gi trong bn thn

khe thi gian. S liu ng xung cng c gi trong

nhng khe thi gian xc nh. Mt c tnh quan trng ca

GPON s dng TDMA l yu cu bt buc v ng b ca

lu lng ng ln trnh xung t sliu.

2.5.2. Phng thc ghp knhPhng thc ghp knh trong GPON l ghp knh song

hng. Cc h thng GPON hin nay s dng phng thc

ghp knh phn chia khng gian. N c thc hin nh sdng nhng si ring bit cho truyn dn ng ln v xung.

Vic sdng hai si quang lm cho vic thit kmng mm

do hn v lm tng khdng bi v chng ta c thm

rng mng bng cch sdng nhng bghp knh theo bc

sng trn mt hoc hai si.


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2.6. Phng thc ng gi d liuGPON nh ngha hai phng thc ng gi ATM v GEM

(GPON Encapsulation Method). Cc ONU v OLT c thh

tr c T-CONT (Transmission Containers) nn ATM hoc

GEM.

GEM s dng ng gi d liu qua mng GPON. GEM

cung cp kh nng thng tin kt ni nh hng tng t

ATM. GPON cho php h trnhiu loi hnh dch vkhch

hng khc nhau. Khch hng ATM c sp xp trong sutvo khung GEM trn chai hng. Khch hng TDM c

sp xp vo khung GEM sdng thtc ng gi GEM. Cc

gi dliu bao gm ccc khung Ethernet cng c sp xp

sdng th tc ng gi GEM. GEM cng h tr vic phn

mnh hoc chia nhcc khung ln thnh cc phn mnh nh

v ghp li u thu nhm gim trcho cc lu lng thi

gian thc. Lu lng dliu bao gm cc khung Ethernet, cc

gi tin IP, IPTV, VoIP v cc loi khc gip cho truyn dn

khung GEM hiu qu v n gin. GPON s dng GEM

mang li hiu qucao trong truyn dn ti tin IP nhsdng

ti 95% bng thng cho php trn knh truyn dn2.7. nh c v phn nh bng tn ng:2.7.1 Thtc nh c(Ranging):mt ONU c thvn hnh trong mng PON n phi c

ranging (xc nh cly gia ONU l OLT). Cly ranging ti

a ca mng PON hin quy nh l 20km.


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2.7.2 Phng thc cp pht bng thng:Hng ln GPON sdng phng thc cp pht bng thng

ng DBA (Dynamic Bandwidth Assignment).2.8. Bo mt v m ha sa liCng nghGPON s dng bo mt hng xung vi chun

mt m tin tin AES (Advanced Encrytion Standard) v sa

li tin FEC (Forward Error Correction).

2.9. Kh nng cung cp bng thng

2.9.1.Hng xung:Tc hng xung ca GPON = 2,488 Mbit/s.

2.9.2.Hng ln:Hng ln GPON c thng lng n 1,25 Gbits/s.

2.9.3.Bng thng hu ch:Cng ngh GPON h tr tc ln ti 1,25 Gbit/s hoc 2,5

Gbit/s hng xung, v hng ln, h tr nhiu mc tc

trong khong t 155 Mbit/s n 2,5 Gbit/s. Hiu sut s dng

bng thng t trn 90%.

2.10. Kh nng cung cp dch vGPON c ng dng ch yu trong cc mng sau:

GPON c ng dng trong cc mng truy nhp quangFTTx cung cp cc dch v nh IPTV, VoD, RF Video,

Internet tc cao, VoIP, Voice TDM vi tc d liu/ thu

bao c th t 1000Mbps, h tr QoS y .


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Gii tr - CATV, HDTV, PPV, PDVR, IPTV H thngng ln Video hon thin cho modem DOCSIS v dch v

Video tng tc, truyn hnh v tinh; tt c cc dch v trn

cp quang GPON.

Thng tin lin lc Cc ng thoi, thng tin lin lc,Truy cp internet, intranet tc cao, Truy cp internet khng

dy ti nhng a im cng cng, ng bng thng ln

(BPLL) v lm backhaul cho mng khng dy

Bo mt - Camera, Bo chy, bo t nhp, Bo ng anninh, trung tm iu khin 24/7 vi kh nng gim st, backup

d liu, SAN

2.11. Mt s vn cn quan tm trong tnh ton thit kmng GPON

Vic tnh ton, thit ki vi mng GPON cn quan tm ti

mt svn sau:

m bo cc iu kin v thng s k thut cng ngh. m bo cc c tnh k thut c bn lp vt l. Bng tn hot ng: i vi hng xung, OLT phn

phi cc gi d liu ti mi ONU trong di bc sng t 1480

ti 1500 nm, thng thng cc thit b hin ti s dng bcsng 1490 nm. Cc ONU gi d liu ng ln OLT trong di

bc sng 1260 nm n 1360 nm, thng thng cc thit b

hin ti s dng bc sng 1310 nm.

Xc nh t l phn tch (hin ti s dng ph bin 2 loil 1:32 v 1:64).


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m bo c ly gia OLT v ONU/ONT trong gii hncho php (< 20 km).

2.12. Kt lunQua cc nghin cu trn, chng ta c thrt ra mt sc

im c bn ca cng nghGPON nh sau:

Cng ngh GPON c ITU chun ho trong cc tiu

chun ITU G984.x

Kthut truy nhp sdng trong GPON l TDMA.

H tr nhiu loi tc truy nhp ng ln t 155 Mbit/s

n 2,5 Gbit/s, htrhai tc truy nhp ng xung 1,25

Gbit/s v 2,5 Gbit/s.

Hng ti mng cung cp dch vy , h trccc dch

vTDM v Ethernet vi hiu sut sdng bng thng cao.

Vn tc nghn lu lng v nhng vn lin quan ca

mng truy nhp quang tc cao c gii quyt bng cc th

tc nh cv phn nh bng tn ng vi cc phng php

kim xot vng vi chu k thch ng, c ch lp lch quay

vng khng y v c bit l c chphn nh bng tn sdng tp thng bo nhiu hng i.

Cc th tc iu khin v bo hiu trong GPON n gin

nhng vn m bo gii quyt cc vn c bn vk thut

ca mng truy nhp bng rng tc cao, p ng cc yu

cu k thut ca dch v, iu khin cho GPON l cng


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ngh s dng bng thng hiu qu nht trong cc loi cng

nghPON hin c.


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CHNG 3.xut cc dch vcung cp ti khch hngtrn mng G PON VNPT H Ni

Phn 1. Mng G-PON VNPT H Ni3.1. Hin trng mng truy nhp bng rng ca Vin

thng H Ni

3.1.1. Mng MAN E3.1.2. Mng cp quang3.2. Cu trc mng G-PON ca Vin thng H Ni3.2.1.

Nguyn tc tchc mng G-PON VNPT H Ni3.2.2. Cu trc mng G-PON VNPT H Ni

3.3. Cc chng loi thit bGPON trn mng G-PONca Vin thng H Ni

3.3.1. Cc chtiu kthut c bn

Phn 2.

Cu trc mng G-PON VNPT H NiPhntch, xut cc dch vc cung cp ti khch

hng trn mng G-PON VNPT H Ni

3.4. nh gi nhu cu sdng dch vca khch hngtrn a bn H Ni

Trn c s s liu v pht trin thu bao ca VNPT H Ni

trong 3 nm gn y, sau khi phn tch, nh gi rt ra nhn

xt : cc dch v internet, truyn s liu bng rng trn cp

quang pht trin vt bc cng vi dch vtruyn hnh tng

tc (FiberVNN, MegaVNN, Metronet, MyTV). Trong nhng

nm ti nhu cu sdng cc dch v ny sngy cng tng

mnh, dch v internet xDSL trn cp ng cng vn pht


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trin nhng vi tc chm hn nhiu so vi cc dch vcp

quang.

3.5.

nh gi hiu qukinh doanh khi cung cp dch vTrn c s s liu v doanh thu ca VNPT H Ni trong 3

nm gn y nht vcc loi hnh dch v, sau khi phn tch,

nh gi rt ra kt lun: cc dch v internet, truyn s liu

bng rng trn cp quang pht trin vt bc cng vi dch v

truyn hnh tng tc (FiberVNN, MegaVNN, Metronet,

MyTV). Doanh thu tcc dch vny sl nhng ngun thurt quan trng trong tng lai, b p nhng st gim tin

thoi cnh.

3.6. xut cc dch v cung cp ti khch hng trnmng G-PON VNPT H Ni

3.6.1. Phm vi cung cp dch v Cu hnh kthut

Cc dch vxut sc cung cp ti khch hng thu bao

bng rng trn a bn TP H Ni v thuc phn vng cc

trm OLT c trin khai lp t theo cu hnh, dung

lng c VNPT H Ni trin khai. Ti mc ny, sliu chi

tit vdung lng, cu hnh mng GPON c nu ti Bngsliu dung lng, cu hnh mng GPON VNPT H Ni giai

on 2012-2013 v ti S mng GPON VNPT H Ni giai

on 2012 2013.

Dbo sliu thu bao sc cung cp dchTrn c s cc s liu pht trin thu bao quang v cc thu

bao internet cung cp trn cp ng c cc ph t 1 triu


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ng/thng trln, hc vin tnh ton v a ra sliu d

bo s lng thu bao quang thuc phn vng phc v ca

mng G-PON VNPT H Ni. Cthnh sau:

- Phng php tnh ton:+ Dbo slng thu bao quang ht nm 2012:

Tsliu thu bao quang FTTx, thu bao Metronet v thu

bao quang cung cp cho mng di ng 2G, 3G ca

Vinaphone (VNP), Mobifone (VMS) tnh n ht thng 5

nm 2012, dbo s lng thu bao G-PON n ht nm2012 sbng:

{(Thu bao FTTx + Thu bao Metronet + Thu bao quang

cho mng VNP, VMS) x 1,4} + Thu internet cp ng c

cc ph 1 triu ng/thng

Gii thch:

Thu bao FTTx, Metronet v thu bao quang cho mngVNP, VMS hin, ang c cung cp trc tip t mng

MAN E, sau khi a mng G-PON v sdng, cc thu

bao ny sc chuyn sang u ni vo mng G-PON.

H s 1,4 l h s dbo tng trng da vo s liu 5

thng u nm 2012.

Cc thu bao internet cp ng c cc ph 1 triung/thng sc chthu bao chuyn sang sdng cp

quang do vi cc ph 1 triu ng/thng hon ton c

th s dng c gi cc cp quang c chi ph r hn,

bng thng ln hn.

+ Dbo slng thu bao G-PON n ht 2013:


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mi vn pht trin. Trong nhng thng u nm 2012, thu

bao cnh vn pht trin khi cc khu chung c, vn phng

ang c hon thin a vo sdng nhiu trong nm 2012.

Tuy nhin, nu vn u t mng cp ng phc vpht trin

thu bao cnh th hiu quu t l khng c v chi ph cp

ng rt cao. V vy, bi ton t ra l phi kt hp cung cp

dch v in thoi c nh cng cc dch v khc trn cp

quang khng phi u t chi ph cho in thoi c nh,

gii phng cp ng phc v pht trin thu bao xDSL hinvn em li doanh thu cao cho VNPT H Ni.

ng thi, vi nng lc ca cc thit bG PON ca VNPT

H Ni, hon ton c khnng cung cp cc dch vtch hp

trn cng i cp quang. iu em li tit kim chi ph u

t ti a.

Tcc phn tch trn, hc vin xut cc dch vc cung

cp trn mng G PON VNPT H Ni nh sau:

1. Dch v FiberVNN2. Dch v FiberVNN + MyTV HD3. Dch v in thoi c nh IMS + FiberVNN4. Dch v in thoi c nh IMS + FiberVNN + MyTV HD5. Dch v MegaWAN ni tnh (VPN L3)6. Dch v MegaWAN lin tnh (VPN L3)3.6.3. Kt lun


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gi d liu TDM v Ethernet. Cc k thut cho php

GPON h tr nhiu loi hnh dch v khc nhau vi tc

truy nhp v cht lng cao.

Vi cc xut cc loi hnh dch vc cung cp ti khch

hng stit kim c chi ph u t, em li ngun thu chnh

trong tng lai ca VNPT H Ni.

3.6.4. Hng nghin cu tip theoNghin cu thm vcc loi hnh dch vc thcung cp trnmng G PON nh dch vtruyn hnh cp (RF Video). Dch

vCATV c h trbao gm: video theo yu cu (VOD),

video tng tc cho cc tr chi, v cc dch vtng tt

tiu chun cao v cc knh kthut s,..

gpon va cung cap dich vu cho vnpt ha noi

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