thuyết minh giới hạn rung fa, trôi fa

7/31/2019 Thuyt minh gii hn rung fa, tri fa

1/52

B THNG TIN V TRUYN THNGHC VIN CNG NGH BU CHNH VIN THNG

VIN KHOA HC K THUT BU IN--------o0o--------

TI

XY DNG TIU CHUN V RUNG PHAV TRI PHA(JITTER AND WANDER) CHO GIAO DIN S THEO PHNCP NG B PDH V SDH

M s: 123-09-KHKT-TC(Bn sa sau nghim thu cp B)

Ch tr ti:ThS. V Hong Sn

Cng tc vin:Ths. Trn Th Thu BnhThs. Phm Hng Nhung

Ks. L c Vng

H ni 2010


2/52

ti: 95-07-KHKT-TC i

Mc lc

Mc lc ................................................................................................................................... i

M u.................................................................................................................................. iiiThut ng vit tt ................................................................................................................. vCHNG 1. NGHIN CU CC TIU CHUN LIN QUAN N RUNGPHA V TRI PHA TRONG H THNG PDH/SDH .................................................. 7

1.1 Cc tiu chun quc t............................................................................................... 71.1.1 Tiu chun v c tnh in ca giao din...................................................... 71.1.2 Tiu chun v c tnh quang ca giao din................................................... 71.1.3 Cc tiu chun lin quan n ng b ............................................................ 81.1.4 Cc tiu chun v rung pha/tri pha............................................................... 91.1.5 Cc tiu chun lin quan n nh gi cht lng li ................................. 171.1.6 Tiu chun v knh thu ring...................................................................... 181.1.7 Cc tiu chun khc ...................................................................................... 19

1.2 Cc qui / tiu chun ngnh ...................................................................................... 191.2.1 Tiu chun TCN 68-177: Yu cu k thut cho h thng thng tin quang vviba SDH tc 155 Mbit/s, 622 Mbit/s v 2.5 Gbit/s .......................................... 201.2.2 Tiu chun TCN 68-173: Tiu chun giao din quang cho cc thit b v hthng truyn dn SDH............................................................................................ 211.2.3 Tiu chun ngnh TCN 68-172:1998 v TCN 68-175:1998 tiu chun v

giao din in kt ni mng................................................................................... 211.2.4 TCN 68-171:1998, ng h ch trong mng ng b Yu cu k thut... 221.2.5 TCN 68-164:1997 Li bt v rung pha ca cc ng truyn dn s- Yu

cu k thut v Quy trnh o kim, ........................................................................ 221.2.6 Qui chun/ Tiu chun v knh thu ring.................................................... 231.3 KT LUN: ............................................................................................................ 25

CHNG 2. NGHIN CU XY DNG TIU CHUN V RUNG PHAV TRI PHA .................................................................................................................... 27

2.1 Khi nim chung: .................................................................................................... 272.2 Yu cu c th i vi quy chun k thut v kt ni mng[1] .............................. 27

2.2.1 Giao din kt ni mng................................................................................. 272.2.2 Quy chun k thut kt ni mng Vin thng............................................... 282.2.3 Phm vi quy chun k thut v giao din kt ni mng................................ 282.2.4 Phm vi cc quy chun k thut v cht lng kt ni ................................. 28

2.3 Xy dng tiu chun Rung pha/tri pha .................................................................. 282.3.1 c im, tnh hnh i tng tiu chun ha.............................................. 282.3.2 L do v mc ch ......................................................................................... 292.3.3 S c v phng php xy dng tiu chun ................................................. 302.3.4 Cu trc Tiu chun...................................................................................... 31

KHUYN NGH P DNG .............................................................................................. 38PH LC A: Phng php o rung pha/tri pha .......................................................... 39

A.1 Gii thiu ......................................................................................................... 39A.2 o Rung pha ti cc giao din ra.................................................................... 41A.3 o rung pha cho php ti giao din u vo .................................................. 42

PH LC B: GII THIU MT S THIT B O .................................................... 43

B.1 Yu cu chung ........................................................................................................ 43B.2 Mt s thit b o .................................................................................................... 44


3/52

ti: 95-07-KHKT-TC ii

B.2.1Thit b ANT-20 ............................................................................................. 44B.2.2 Thit b o SF-60 v SFO-60 ........................................................................ 47B.2.3 HP E1725C. .................................................................................................. 47

TI LIU THAM KHO.................................................................................................. 49


4/52


5/52

ti: 95-07-KHKT-TC iv

Phn II: TIU CHUN QUC GIA V GII HN RUNG PHA V TRIPHA TRONG MNG S THEO PHN CP S NG B (SDH) VPHN CP 2048kbit/s p dng trn mng vin thng ca Vit nam.

Ngoi phm vi cng c duyt, ti xy dng thm cc yu cu v

cc giao din ph hp vi mng thc t v nhu cu pht trin ca mng inh: 8, 34, 140 Mbit/s v STM-256.

Ngoi ra ti cn c cc ph c trong tm tt cc phng php, giithiu thit b o in hnh.

Trong qu trnh thc hin, ti khng th trnh khi nhng sai st. V vy ti c th p dng c trn mng i, nhm thc hin ti rt mongnhn c s ng gp kin ca cc chuyn gia trong Ngnh.

Xin trn trng cm n.


6/52

ti: 95-07-KHKT-TC v

Thut ng vit tt

T vittt

T ting Anh Ngha

ATM Asynchronous Transfer Mode Phng thc truyn tikhng ng b

CMI Coded Mark Inversion o du m

MRTIE Maximum Relative Time Interval Error Sai s khong thi giantng i cc i

MS-AIS Multiplex Section Alarm Indication

Signal

Tn hiu ch th cnh

bo phin ghp knhMTIE Maximum Time Interval Error Sai s khong thi gian

cc i

NE Network Element Phn t mng

NNI Network-Network Interface Giao din mng mng

PDH Plesiochronous Digital Hierarchy Phn cp s cn ngb

Pk-pk Peak-to-peak nh ti nhPLL Phase Locked Loop Vng kha pha

ppm Parts per million Phn triu

PRSB Pseudo-Random Binary Sequence Chui nh phn gingu nhin

PRC Primary Reference Clock ng h chun s cp

RTIE Relative Time Interval Error Sai s khong thi giantng i

SDH Synchronous Digital Hierarchy Phn cp s ng b

SEC SDH Equipment Clock ng h thit b SDH

SSU Synchronization Supply Unit Khi cung cp ng b

STM-1e Synchronous Transport Module, level 1(electrical format CMI-encoded signal)

Modue truyn ti ngb, mc 1

STM-N Synchronous Transport Module, levelN

Modue truyn ti ngb, mc N

TDEV Time Deviation ch thi gian


7/52

ti: 95-07-KHKT-TC vi

TIE Time Interval Error Sai s khong cch thigian

UI Unit Interval Khong n v

UIpp Unit Interval, peak-to-peak Khong n v, nh-nh

UNI User-Network Interface Giao din ngi mng

UTC Universal Time Co-ordinated Gi phi hp quc t

VC-n Virtual Container, level n Container o, mc n


8/52

ti: 95-07-KHKT-TC 7

CHNG 1. NGHIN CU CC TIU CHUN LIN QUANN RUNG PHA V TRI PHA TRONG H THNGPDH/SDH

Trong phn ny s r sot i cc tiu chun in quan n PDH/SDH m cs cho vic xy dng tiu chun v phng php o cc chng sau. V mngvin thng ca Vit nam ch yu tun theo cc tiu chun ca ITU -T v ETSInn trong phn di y s thc hin tm tt cc tiu chun in hnh ca ITU-T, ETSI in quan n Rung pha v tri pha

1.1 Cc tiu chun quc t

1.1.1 Tiu chun v c tnh in ca giao din

1.1.1.1ITU-T G.703 -c tnh in/vt l ca cc giao din phn cp sKhuyn ngh ny a ra cc ch tiu v c tnh in v vt ca cc giao dinti phn cp s nh qui nh trong khuyn ngh G.702 (PDH) v G.707 (SDH),vi mc ch nhm kt ni cc thnh phn ca mng truyn dn s.

Cc giao din phn cp s c qui nh trong khuyn ngh ny bao gm: giao

din ti tc 64 kbit/s, 1544 kbit/s, 2048 kbit/s, 6312 kbit/s, 32064 kbit/s,44736 kbit/s, 8448 kbit/s, 34368 kbit/s, 139264 kbit/s, giao din ng b 2048kHz, giao din 97728 kbit/s, 155520 kbit/s (STM-1e), 51840 kbit/s (STM-0).

1.1.2 Tiu chun v c tnh quang ca giao din

1.1.2.1ITU-T G.957 - Giao din quang cho cc thit b v h thng lin quann phn cp s ng b

- Khuyn ngh ny a ra cc ch tiu v giao din quang cho cc thit b vh thng SDH c nh ngha trong khuyn ngh G.707 v m vic trnsi quang n mode G.652, G.653 v G.654

- Mc ch ca khuyn ngh ny a ra cc ch tiu v giao din quangcho cc thit b SDH c nh ngha trong khuyn ngh G.783 tc kh nng tng hp ngang trn mt tuyn truyn dn (tc khnng s dng thit b t nhiu nh cung cp khc nhau trn cng mttuyn truyn dn)

- Cc ch tiu trong khuyn ngh ny c p dng cho cc h thng trong mi hng truyn dn s dng mt si quang.


9/52

ti: 95-07-KHKT-TC 8

- Cc ch tiu v giao din quang c qui nh cho cc oi h thng .1.1.3 Cc tiu chun lin quan n ng b

1.1.3.1ITU-T G.812 - Yu cu v c tnh nh thi cacc ng h t cs dng lm cc ng h nt trong mng ng bKhuyn ngh ny a ra cc yu cu ti thiu cho cc thit b c s dng nhng h nt trong cc mng ng b. Chc nng ca ng h nt a chnmt trong cc ng ng b ngoi a vo trm vin thng nh tn hiuchun ng b, thc hin gim rung pha v tri pha v sau c phn phin cc thit b khc trong trm.

Khi hot ng bnh thng ng h nt hot ng nh ng h th, bm theo

ng h chun s cp. Vi mc ch d phng, ng h nt ni chung s cnhiu tham chiu u vo. Khi tt c cc ng vo gia ng h ch v ngh nt hng, ng h nt s c kh nng duy tr hot ng trong cc gii hnc tnh qui nh (kiu hot ng u gi)

ng h nt c th mt thit b ring bit (SASE) hoc c th mt phn cathit b khc nh tng i hoc thit b u cho SDH.

Cc ch tiu v cht ng i vi cc ng h nt c a ra trong khuynngh ny cho 3 kiu ng h:

- ng h kiu I: ch yu dng trong cc mng c ti u cho phn cp2048 kbit/s

- ng h kiu II v III ch yu dng cho phn cp 1544 kbit/sNgoi ra, trong ph c A cn cp n 3 kiu ng h khc :

- ng h kiu IV: c trin khai ch yu trong cc mng c h trcho phn cp 1544 kbit/s

- ng h kiu V: c trin khai ch yu trong cc nt chuyn tip c cphn cp 1544 v 2048 kbit/s

- ng h kiu VI: c trin khai in hnh trong cc nt mng ni ht c trn phn cp 2048 kbit/s

Cc yu cu k thut c a ra i vi mi oi ng h ny bao gm:

- Dung sai nhiu:

L mc nhiu ti thiu m ng h phi chp nhn c m vn m bo:

- Duy tr ng h trong cc gii hn c tnh qui nh- Khng gy nn bt c cnh bo no


10/52

ti: 95-07-KHKT-TC 9

- Khng m cho ng h chuyn i tham chiu- Khng lm cho ng h chuyn sang ch u gi

Trong mc ny cn cp n dung sai rung pha v tri pha cho 3 kiu ng h

oi I, II v III.- Truyn ti nhiu:

Truyn ti nhiu th hin ng nhiu pha xut hin ti u ra khi c nhiu ca ti u vo.Ch tiu v mt n tri pha c qui nh trong iu kin tnhiu vo c nhiu

1.1.3.2ITU-T G.813 - Yu cu v c tnh nh thi ca cc ng h t trongthit b SDH (SEC)

Khuyn ngh ny a ra cc yu cu k thut cho ng h s dng trong thit bSDH (SEC). Trong trng hp bnh thng, ng h ny hot ng bm theoPRC. Tuy nhin th ng h ny c th s dng nhiu u vo chun, v trongtrng hp tt c cc ngun chun b mt th ng h ny s hot ng ch u gi.

Khuyn ngh ny a ra cc ch tiu cho 2 oi ng h SEC:

- Loi 1: cc ng h s dng trong mng SDH c ti u cho phn cps 2048 kbit/s

- Loi 2: cc ng h s dng trong mng SDH c ti u cho phn cps 1544 kbit/s

Cc ch tiu a ra i vi SEC cng tng t nh i vi SSU

1.1.4 Cc tiu chun v rung pha/tri phaCc tiu chun in quan n rung pha/ tri phabao gm: ITU-T G.823, G.825v ITU-T G.783

1.1.4.1ITU-T G.823 - Yu cu vrung pha v tri pha trong cc mng s datrn phn cp s 2048 kbit/sKhuyn ngh ny a ra cc yu cu v rung pha v tri pha xut hin ti ccgiao din nt mng (NNI) ca phn cp s cn ng b (PDH) v cc mngng b da trn tc bit phn cp mc 1: 2048 kbit/s

i vi giao din u ng, khuyn ngh ny a ra cc ch tiu inquan n:

- Gii hn mng i vi gi tr rung pha v tri pha u ra ti cc giao din2, 34, 140 Mbit/s

- Dung sai rung pha v tri pha u vo ti cc giao din 2, 34, 140 Mbit/s


11/52

ti: 95-07-KHKT-TC 10

i vi giao din ng b, khuyn ngh ny a ra cc ch tiu in quan n:

- Gii hn mng i vi gi tr rung pha v tri pha u ra ti cc giao dinng b. C th :

-

Gii hn mng i vi gi tr rung pha u ra ti cc giao din 2048 kHzv 2048 kbit/s cho cc ng h PRC, SSU, SEC v giao din ng bPDH. Cc gi tr gii hn ny c cho trong bng 5 ca G.823 vi thigian o 60 s

- Gii hn mng i vi gi tr tri pha u ra ti cc giao din ca ccng h PRC, SSU, SEC v giao din ng b PDH biu th thng qua 2tham s MTIE v TDEV. Cc gi tr ny c cho trong cc bng t 6n 13 ca ITU-T G.823

- Dung sai rung pha v tri pha ti u vo ca cc giao din ng b. Cc gitr ny c tham chiu n dung sai rung pha v tri pha u vo cho cccng u vo ng h kiu I ca ITU-T G.812 cho cc thit b c chc nngSSU, v chn a 1 ca ITU-T G.813 cho cc thit b c chc nng SEC

1.1.4.2ITU-T G.825 - Yu cu vrung pha v tri pha trong cc mng s datrn phn cp s ng b SDHKhuyn ngh ny a cc tham s v cc gi tr in quan nhm kim sot tt

ng rung pha v tri pha ti cc giao din mng - mng SDH (NNI), bao gm:- Gii hn mng cc i i vi gi tr rung pha v tri pha- Dung sai rung pha v tri pha ti thiu ca thit b i vi cc giao din

u ng v giao din ng b da trn phn cp s ng b (SDH)

C th nh sau:

- Gii hn mng cho rung pha: cp n rung pha cho php n nht ticc giao din STM-1, STM-4, STM-16, STM-64, STM-256

- Gii hn mng cho tri pha: cc giao din STM-N c coi cc giaodin ng b. Gii hn mng cho tri pha ti cc giao din ng b nyc tham chiu n khuyn khuyn ngh G.823

- Dung sai tri pha ti cc cng vo STM-N: vi cc giao din STM-Nc s dng nh giao din ng b c tham chiu n khuyn nghG.812, G.813 (tc phi p ng cc ch tiu dung sai tri pha qui nhtrong khuyn ngh G.812, G.813)


12/52


1.1.4.3ITU-T G.783 -c tnh cc khi chc nng ca thit b SDHTrong khuyn ngh ny c cp cc ch tiu v rung pha sinh ra do qu trnhsp xp cc tn hiu nhnh G.703 (PDH) vo trong cc container ca khungSDH G.707 v cc ch tiu i vi rung pha kt hp. Rung pha kt hp y

c hiu bao gm rung pha sp xp v rung pha do qu trnh dch chuyncon tr gy nn.

Khuyn ngh ny cng a ra qui nh i vi chui th con tr c s dng o rung pha kt hp

1.1.4.4 Tiu chun ETSI EN 302 084- iu khinrung pha v tri pha trongmng truyn tiTrong mng truyn ti, rung pha v tri pha c tch y dc trn cc ng

truyn d iu do rung pha, tri pha ni ti v c tnh hm truyn t ca mithit b to nn.Rung pha v tri pha n c th nh hng bt i n c tn hiu s (v dnh, gy ra i bt, khng iu khin c ni v cc hin tng bt thng khc)v cc tn hiu tng t (v d nh iu ch pha khng mong mun ca tn hiuc truyn). Thng thng, nh hng nh th ph thuc vo dch v c thc cung cp v thit b u cui hoc thit b thch ng c in quan.V th cn thit phi thit p gii hn rung pha, tri pha ti cc giao din mng m bo cht ng tn hiu c truyn v hot ng ca thit b.

Quan im iu khin rung pha v tri pha ca tiu chun ny da trn yucu:

nh r gii hn rung pha v tri pha cc i ca mng m khng cn hn ti bt k giao din in quan no.

nh r dung sai thit b nh nht i vi rung pha v tri pha cn ccung cp ti bt k giao din in quan.

Thit p mt c cu nht qun cho ch tiu k thut ca cc oi thit b sring r.

Cung cp thng tin v hng dn o v nghin cu cc c tnh rungpha, tri pha trong bt k cu hnh mng no.Ni dung ca tiu chun ny c ITU chp thun a vo cc khuyn nghG.823 v G.825

1.1.4.5 Tiu chun ETSI EN 300 462-3 - iu khin rung pha v tri phatrong mng ng bCng tng t nh tiu chun ETSI EN 302 084 a ra yu cu cho tn hiu ung, ETSI a ra cc yu cu cho rung pha v tri pha cho cc giao din cp

tn hiu ng b trong mng ng b. Cc yu cu a ra bao gm cc ch tiurung pha v tri pha ti cc giao din mng ca cc thit b PRC, SSU, SEC v


13/52


PDH.Ni dung ca tiu chun ny c ITU- T chp thun a vo khuyn nghG.823.

Bng sau ch ra s so snh v nh x cc phn ni dung ca cc tiu chun ETSIv ITU-T v rung pha v tri pha. Qua cho thy cc khuyn ngh ca ITU-Tchnh lbn chp thun t cc tiu chun ETSI xut tng ng v c bcc, cp nht mi hn.


14/52


15/52


5.2.1 2048 kbit/s interfaceoutput wander limit

5.2.1 2 048 kbit/s interfaceoutput wander limit





5.2 Network limits forwander

5.2.4 STM-N interfaceoutput wander limit

6 Network limits forsynchronization interfaces

7 Network limits forjitter and wander atsynchronizationinterfaces

7 Jitter and wandertolerance of networkinterfaces

7.1 Jitter and wandertolerance of traffic interfaces

6 Jitter and wandertolerance of equipmentinterfaces

7.1.1 64 kbit/s input jitter andwander tolerance 6.1 64 kbit/s input jitter andwander tolerance

7.1.2 2048 kbit/s input jitterand wander tolerance

6.2 2 048 kbit/s input jitterand wander tolerance

7.1.3 8448 kbit/s input jitterand wander tolerance

6.3 8 448 kbit/s input jitterand wander tolerance


16/52


7.1.4 34 368 kbit/s input jitterand wander tolerance

6.4 34 368 kbit/s inputjitter and wander tolerance

7.1.5 139 264 kbit/s inputjitter and wander tolerance

6.5 139 264 kbit/s inputjitter and wander tolerance

7.2 Jitter and wandertolerance of synchronization

interfaces

6.1 Jitter and wandertolerance for STM-N input

ports

6.6 STM-N input jitter andwander tolerance

Annex A Network modelunderlying thesynchronization networklimit

4 Basic philosophy forthe control of jitter andwander

5 Synchronizationinterfaces

6 Synchronizationreference network

Annex B (informative):Network model

underlying the networklimit

Annex B Network wanderreference model andparameters

4 Network wanderspecification

Appendix I Wander limitconsiderations for SDHtransport networks

Annex A (informative):Wander limit

considerations for SDH


17/52


transport networks

Appendix II Measurementmethodologies for outputwander

Appendix II Measurementmethodology for outputwander of synchronousinterfaces

Annex B (informative):Measurement

methodologies for outputwander

Appendix III Measurement

guidelines for input jitter andwander tolerance ofequipment interfaces

Annex C (informative):

Measurementguidelines for input jitterand wander tolerance of

equipment interfaces

Appendix I Relationshipbetween network interface

jitter requirements and inputjitter tolerance

Annex D (informative):Relation betweenparameters for input jittertolerance and output jitterlimits


18/52


1.1.5 Cc tiu chun lin quan n nh gi cht lng li

1.1.5.1ITU-G.826 Tham s v ch tiu cht lng li cho cc lung v kt ni

s quc t tc bit khng iPhin bn u tin ca G.826 ra i vo thng 7/1983. Phin bn ny c tn Tham s v ch tiu cht ng cho ung s quc t c tc bit khng in hn hoc bng tc c s (1544 hoc 2048 kbit/s)

n thng 12/2002 mt phin bn mi ca G.826 ra i vi tn Tham sv ch tiu cht ng cho cc ung v kt ni s quc t tc bit khng i.Vi phin bn mi ny, G.826 m rng phm vi p dng ca mnh cho c ccung/kt ni c tc nh hn tc c s (v vy khuyn ngh G.821 chc p dng cho cc kt ni gia cc thit b c sn xut trc 2002)

Cc ch tiu c a ra trong khuyn ngh ny khng ph thuc vo mng vt cung cp ung v kt ni. Cc ch tiu ny phi c m bo cho c 2hng truyn dn ca ung / kt niv da theo phn b cho ung s quc tgi nh chun 27500 km..

Vi cc ung s m vic ti tc bit n hn hoc bng tc bit c s, ccch tiu a ra trong khuyn ngh ny c da trn khi nim o i khi s

dng cc m pht hin i c sn trong ung cn kim tra. Nh c th thchin o trong qu trnh khai thc dch v.Cn i vi cc kt ni s c tc nh hn tc c s ca phn cp s, cc ch tiu a ra da trn khi nim oi bit v v vy khng h tr vic o trong qu trnh khai thc dch v.

Cc tham s cht ng c a ra bao gm: ESR, SESR, BBER. Thi gian

o cc tham s ny c khuyn ngh l 1 thng.

1.1.5.2ITU-T G.828 Tham s v ch tiu cht lng cho cc lung SDH quc

t tc bit khng iKhuyn ngh ny ra i thng 3/2000 nhm gii quyt cc hn ch ca G.826khi p dng cho vic nh gi cht ng i ca cc ung SDH. Khc bit caG.828 so vi G.826 c th hin cc im sau:

- Cc ch tiu a ra trong khuyn ngh ny c xc nh c th cho tngung SDH (trong G.826, cc ch tiu c qui nh cho 1 di tc ).

- Bn cnh cc tham s cht ng nh ca G.826 (ESR, SESR, BBER), G.828cn a thm tham s SEPI (vi s kin i SEP c nh ngha chu k


19/52


m trong c ti thiu 3 (nhng t hn 9) SES xut hin in tip). Tuynhin cc gi tr ca tham s ny vn c ITU tip tc nghin cu.

1.1.5.3ITU-T M.2110 Ho mng h thng truyn dn, on v lung

Khuyn ngh ny a ra qui trnh ho mng cc thc th truyn dn trong mitrng c nhiu nh khai thc. Cc thc th truyn dn y bao gm ung,on v h thng truyn dn. Qui trnh ho mng y c phn bit cho 2trnghp: i vi h thng c/khng c kh nng gim st trong qu trnh khaithc dch v (ISM).

Theo khuyn ngh ny ho mng cc thc th truyn dn cn phi thc hinmt s cc php o. Cc php o ny ghi i s cc s kin cht ng xy ratrong nhng khong thi gian nht nh v so snh kt qu ny vi cc gi trgii hn. Cc gi tr gii hn ny khc nhau i vi cc s kin cht ng vvi cc php o khc nhau. Cc php o khc nhau y php o kim tratnh in tc ca tuyn (thi gian o ti a 15 pht), o 15 pht, o 2 h v o24 h phi c p dng cho tng hng truyn dn. Bt c khi no c th, nns dng cu hnh o cho cho tng hng truyn dn ring bit (tc khngthc hin u vng ti u xa trong qu trnh o).

1.1.5.4ITU-T M.2101 - Gii hn cht lng cho ho mng v bo dnglung v on ghp knh SDHTrong rt nhiu trng hp, vic o trong thi gian 1 thng khng th thchin c. V vy khuyn ngh M.2101 a ra cc gii hn v cht ng chocc khongthi gian o ngn hn, trn c s da theo ch tiu G.826/G.828.

1.1.6 Tiu chun v knh thu ringEU a ra cc qui nh, mang tnh cht qui phm bt buc p dng chocc nc thnh vin v knh thu ring [4][5] s dng trong vin thng: t

knh anaog, 64kbit/s, 2048kbit/s v SDH. V knh thu ring SDH, EU pdng theo 2 tiu chun:

- ETSI EN 301 164: "Transmission and Multiplexing (TM); SynchronousDigital Hierarchy (SDH); SDH leased lines; Connection characteristics".

Tiu chun ny a ra cc yu cu k thut v cc php o c th v chtng knh thu ring cu trc vc-12, vc-2, vc-3, vc-4

- EN 301 165: "Transmission and Multiplexing (TM); Synchronous DigitalHierarchy (SDH): SDH leased lines; Network and terminal interfacepresentation".


20/52


Tiu chun ny a ra danh sch cc yu cu mang tnh cht tham chiu n cctiu chun khc nh v giao din in/ quang (G.703, G.957), cu trc ghpknh (G.707)

1.1.7 Cc tiu chun khc- ITU-T G.781 Cu trc cc khuyn ngh v thit b i vi phn cp sng b (SDH)

- ITU-T G.782 Kiu v c tnh chung ca cc thit b SDH- ITU-T G.783 c tnh ca cc khi chc nng trong thit b SDH- ITU-T G.784 Qun SDH- ITU-T G.832 Truyn ti ca cc phn t SDH trong mng PDH - cu trckhung v cu trc ghp knh- ITU-T G.841 Kiu v c tnh ca cc kin trc bo v mng SDH- ITU-T O.171 v 172 Thit b o rung pha v tri pha cho cc h thng sda trn phn cp s ng b

- ITU-T O.181 Thit b nh gi cht ng i trn giao din STM-N1.2 Cc qui / tiu chun ngnh

Bng 1-2 Tiu chun/ Qui chun k thut in quan n SDH v phc v kt nimng

TT Tn Quy chun k thut M s Tnh trngVh thng, cng ngh SDH

1H thng thng tin quang v vi ba SDH -Yu cu k thut

TCN 68-177:1998

ang c hiuc v cxem xt, rsot chuyn

i sang Tiuchun VNV giao din

2Giao din quang cho cc thit b v hthng truyn dn SDH - Yu cu k thut

TCN 68-173:1998

ang c hiuc v cxem xt, rsot chuyni sang Qui

chun VN

3Giao din kt ni mng - Yu cu kthut

TCN 68-172:1998

4Cc giao din in phn cp s - Yu cuk thut

TCN 68-175:1998

V ng b v cht lng

5 ng h ch trong mng ng b - Yu TCN 68- ang c hiu


21/52


cu k thut 171:1998 c v cxem xt, rsot chuyni sang Qui

chun VN

6

Li bt v rung pha ca cc ng truyndn s - Yu cu k thut v Quy trnho kim

TCN 68-164:1997

V Knh thu ring

7Giao din knh thu ring cu trc s vkhng cu trc s tc 2048 kbit/s -Yu cu k thut

TCN 68-225:2004

ang c hiuc v cxem xt, rsot chuyni sang Qui

chun VN8

Knh thu ring cu trc s tc 2048kbit/s - Tiu chun cht ng

TCN 68-226:2004

9

Thit b u cui kt ni vo mng vin

thng cng cng s dng knh thu ringtc n x 64 kbit/s Yu cu k thut

TCN 68-

216:2002

ang c hiu

c v cxem xt, rsot chuyn

i sang Tiuchun VN

10Thit b u cui kt ni vo mng vinthng cng cng s dng knh thu ringtc 2048 kbit/s Yu cu k thut

TCN 68-217:2002

1.2.1 Tiu chun TCN 68-177: Yu cu k thut cho h thng thngtin quang v viba SDH tc 155 Mbit/s, 622 Mbit/s v 2.5 Gbit/si vi phn h thng thng tin quang SDH tiu chun ny cp n cc ni

dung sau:- Qui nh v cu trc ghp knh (da trn khuyn ngh ITU-T G.707)

- Ch tiu giao din vt l

- Ch tiu giao din in (STM-1e) (da trn khuyn ngh ITU-T G.703)- Ch tiu giao din quang cho cc h thng n knh tc STM-1, STM-

4, STM-16 vi cc ng dng I, S, L, V, U trn cc si G.652, G.653,G.655 (da trn cc khuyn ngh ca ITU-T G.957, G.691)

- Ch tiu giao din quang cho cc h thng a knh quang (da trnkhuyn ngh ITU-T G.692)

- Ch tiu v cht lng truyn dn:

- Ch tiu v rung pha v tri pha (da trn khuyn ngh ITU-T G.825)- Ch tiu v c tnh i h thng (da trn khuyn ngh ITU-T G.826)

- Yu cu v ng b (da trn cc khuyn ngh ITU-T G.811, G.812,G.813)

-Yu cu v qun l (da trn khuyn ngh ITU-T G.784)


22/52


Bn d tho tiu chun ny c r sot chnh sa b sung trn c s kt qu ti:R SOT, CHUYN CC TIU CHUN NGNH SANG QUI CHUN KTHUT V TIU CHUN VIT NAM,M s: 95 06KHKTTC [2]

1.2.2 Tiu chun TCN 68-173: Tiu chun giao din quang cho ccthit b v h thng truyn dn SDH

Tiu chun ny c xy dng da trn cc tiu chun ca ITU -T G.957 vITU-T G.691. Tiu chun a ra cc yu cu, ch tiu k thut cn thit i vigiao din quang cho cc thit b v h thng thng tin quang SDH s dng trnmng vin thng Vit nam.

Tiu chun ny ch p dng cho cc h thng n knh quang v trong mihng truyn dn s dng mt si quang. i vi cc h thng c khuch iquang, tiu chun ny ch p dng cho cc h thng s dng khuch di cngsut v/hoc thit b tin khuch i.

Cc ch tiu a ra trong tiu chun ny bao gm:

- Tiu chun giao din quang i vi cc h thng khng s dng khuch iquang (STM-1, STM-4, STM-16, STM-64) vi cc ng dng I, S, L trn cc

si G.652, G.653, G.654- Tiu chun giao din quang i vi cc h thng c s dng khuch i

quang (STM-4, STM-16, STM-64) vi cc ng dng V, U trn cc siG.652, G.653, G.654

Bn d tho tiu chun ny c r sot chnh sa b sung trn c s kt qu ti: R SOT, CHUYN CC TIU CHUN NGNH SANG QUICHUN K THUT V TIU CHUN VIT NAM ,M s: 95 06KHKT

TC [2]

1.2.3 Tiu chun ngnh TCN 68-172:1998 v TCN 68-175:1998 tiuchun v giao din in kt ni mng

TCN 68-172:1998, Giao din kt ni mng do Tng cc Bu in ban hnhngy 29 thng 9 nm 1998.TCN 68-172:1998 quy nh cc yu cu k thut i vi cc giao din tn hius tc 2048 kbit/s v giao din tn hiu ng b 2048 kHz .Khuyn ngh ny quy nh cc yu cu v giao din in/vt ca phn cp s.

Khuyn ngh ITU-T G.703 c b sung sa i nm 2001.


23/52


TCN 68-175:1998, Cc giao din in phn cp s do Tng cc Bu in banhnh ngy 19 thng 12 nm 1998Tiu chun TCN 68-175:1998 trnh by cc yu cu v c tnh in ca ccng truyn s tc 64 kbit/s, 2048 kbit/s, 34368 kbit/s, 139264 kbit/s,

155520 kbit/s v 2048 kHz p dng vi mng vin thng Vit Nam.Ti liu p dng : ITU-T G.703, Physical/Electrical Characteristics ofHierarchical Digital Interfaces

Nhm nghin cu ti [3] nghin cu v xut a ra tiu chun/ quichun mi trn c s: TCN 68-172:1997 kt hp vi TCN 68-175:1998 vchuyn i sang dng Quy chun K thut Quc gia: Giao din kt ni mng Yu cu k thut v in, vt . B xung thm phn cu trc khung ca ccgiao din.

1.2.4 TCN 68-171:1998, ng h ch trong mng ng b Yu cuk thutTiu chun ng h ch trong mng ng b - Yu cu k thut, quy nhnhng yu cu ti thiu cho ng h ch cp tn hiu ng b cho mng s .TC ny do Tng cc Bu in ban hnh ngy 29 thng 9 nm 1998.Cc ti liu gc:- ITU-T G.811, Timing characteristics of primary reference clocks

Khuyn ngh ny a ra nhng yu cu ti thiu cho cc thit b nh thic s dng nh cc ng h ch trong cc mng ng b. Cc mng ny bao

gm cc Mng in thoi cng cng (PSTN) v cc mng Phn cp s ng b(SDH).

Khuyn ngh ITU-T G.811 c xem xt bi nhm nghin cu 13 caITU-T (1997-2000) v c ph chun vo ngy 19 thng 9 nm 1997.- ETSI EN 300 462-6-1 V1.1.1 (1998-05) Transmission and Multiplexing (TM);Generic requirements for synchronization networks; Part 6-1: Timingcharacteristics of primary reference clocks.Tiu chun ny a ra nhng yu cu cho ng h tham chiu s cp (PRC)

ph hp cho cung cp ng b ti cc mng s.[3]

1.2.5 TCN 68-164:1997 Li bt v rung pha ca cc ng truyndn s -Yu cu k thut v Quy trnh o kim,TCN 68-164:1997, Li bt v rung pha ca cc ng truyn dn s Yu cuk thut v quy trnh o kim, c Tng cc Bu in ban hnh ngy 30 thng12 nm 1997.Tiu chun ny p dng cho cc ng truyn dn s PDH (2, 8, 34, 140Mbit/s), SDH (155, 622, 2500 Mbit/s) v cc u ni chuyn mch s 64 kbit/si vi di quy chun.

Tiu chun ngnh TCN 68-164:1997 c s dng o kim, nh gi chtng cc ng truyn dn s nhng tiu chun ny cha c cp nht mi.


24/52


Hng x :

- r sot phn yu cu k thut v i bt theo cc ti iu tham chiu mi caITU-T xy dng d tho Quy chun k thut quc gia v i bt ca ngtruyn dn s (p dng cho tuyn truyn dn kt ni mng gia hai doanh

nghip); chuyn i sang khun dng Quy chun k thut v b sung cc quynh v qun .

- S nghin cu cc yu cu k thut v rung pha v tri pha trn c s cckhuyn ngh mi ca ITU-T, ETSI (nh G.823, G.825) xy dng Quy chunk thut quc gia v rung pha v tri pha ca ng truyn dn s.

1.2.6 Qui chun/ Tiu chun v knh thu ring

1.2.6.1 TCN 68-225:2004: Giao din knh thu ring cu trc s v khng

cu trc s tc 2048 kbit/s - Yu cu k thut:Tiu chun Ngnh TCN 68-225: 2004 Giao din knh thu ring cu trc s vkhng cu trc s tc 2048 kbit/s Yu cu k thutc xy dng datrn c s chp thun p dng nguyn vn tiu chun ETSI EN 300 418V1.2.1 (02-2001) ca Vin Tiu chun Vin thng chu u.Nay tiu chun nyc B Thng tin v truyn thng qui nh oi Qui chunv giao din

ETSI EN 300 418: Access and Terminal (AT); 2048 kbit/s digital unstructuredand structured leased lines (D2048U and D2048S); Network Interface

Presentation.Phm vi v i tng p dngTiu chun ny quy nh cc yu cu k thut v cc nguyn tc kim tra i vigiao din mng ca cc knh thu ring tc 2048 kbit/s tr khng 120 , baogm:Knh thu ring khng cu trc s 2048 kbit/s;Knh thu ring cu trc s 2048 kbit/s c tc truyn tin 1984 kbit/s.Tiu chun ny bao gm cc c tnh vt , c kh v in (tr cc kha cnhv an ton in, qu p v tng thch in t) ca giao din mng, ng thi

a ra cc php kim tra thch hp i vi thit b cung cp giao din.Tiu chun ny m s c cho vic qun kt ni knh thu ring tc 2048kbit/s.

1.2.6.2 TCN 68-226:2004: Knh thu ring cu trc s tc 2048 kbit/s -Tiu chun cht lngTiu chun Ngnh TCN 68-226: 2004 Knh thu ring cu trc s tc 2048kbit/sTiu chun cht ngc xy dng da trn c schp thun pdng nguyn vn tiu chun ETSI EN 300 419 V1.2.1 (02-2001) ca Vin Tiu

chun Vin thng chu u.Nay tiu chun ny c B Thng tin v truynthng qui nh oi Qui chun v cht ng knh thu ring.


25/52


- ETSI EN 300 419: "Access and Terminals (AT); 2 048 kbit/s digital structuredleased lines (D2048S); Connection characteristicsPhm vi v i tng p dngTiu chun ny bao gm cc ch tiu cht ng cho knh thu ring cu trc s

tc 2048 kbit/s.Tiu chun ny c s C quan qun Nh nc thc hin vic qun cht ng knh thu ring cu trc s tc 2048 kbit/s do cc doanh nghipcung cp knh thu ring cung cp theo cc quy nh v qun cht ng buchnh, vin thng.Tiu chun ny c s cho doanh nghip nh gi cht ng knh thu ringcu trc s tc 2048 kbit/s .Tiu chun ny s c cho cc yu cu v cht ng trong vic kt ni knhthu ring cu trc s tc 2048 kbit/s trc khi a vo khai thc v s dng.

1.2.6.3 Qui chun cht lng knh thu ring SDHTiu chun cht ng knh thu ring SDH c xy dng da trn cc tiuchun ETSI EN 301 164 v khuyn ngh ITU khc v a ra cc yu cu c thcho cc tham s ca knh cu trc vc-12, vc-2, vc-3, vc-4, bao gm:

Dung sai nh thi ca Cng ten n o:bao gm cc yu cu c th vnh thi ca tn hiu ph hp vi cc tiu chun v ng b, nh thitrong SDH nh G.813, G.825 hay nh trong TCN 68-164:1997 v TCN68-177:1998; v v con tr nh G.783

Tr truyn: cc yu cu ti thiu v tr n nht ca tn hiu truyntrn knh thu ring c xc nh trn c s yu cu v cht ng dchv p trn

Rung pha: cc yu cu ph hp vi cc tiu chun v rung pha ti ccgiao din theo cc chun G.825 hay TCN 68-177:1998 bao gm cc yucu: dung sai Rung pha u vo n nht, Rung pha u ra ca knh thuring phi ti thiu p ng yu cu tiu chun ti giao din tng ng

Kh nng truyn ti thng tin: yu cu truyn ti thng tin trong sutm bo theo cu trc chun ca SDH v a ra cc tn hiu cnh bo tithiu phi c khi knh thuring c s c.

c tnh li: ph hp vi iu kin p dng trng thc t, cc yu cuc th cho cc tham s c tnh i c xc nh trong thi gian o th24 gi. Cc yu cu ny c xc nh c th trn c s cc ch tiuchun o trong 1 thng theo G.826 v cc gii hn o ngn hn theo

M.2100 (TCN 68-164:1997 v TCN 68-177:1998)


26/52


Cng vi cc yu cu c th v cc tham s cht ng knh thu ring tiuchun gc ca ETSI cng a ra cc yu cu v o kim tng ng.

1.3 KT LUN:

Sau khi r sot, nghin cu cc tiu chun ca ITU-T, ETSI, v ca Ngnh clin quan, ti i n mt s kt un nh sau:

- Nh vy c th thy cc tiu chun ngnh v mng quang hu ht da trncc tiu chun ITU-T v ETSI. Hin nay, cc khuyn ngh ITU-T v ETSI mcc tiu chun ny p dng v bin son c cp nht v b xung mi. VB BC_VT v ang tip tc cho r sot v cp nht b sung mi cc tiuchun ngnh tng ng.

-

Hin nay cc tiu chun Ngnh in quan n PDH/SDH bao gm: tiu chunv giao dinquang/ in, tiu chun v cht ng ng b, tiu chun v hthng, c th:

i vi cc tham s quang ca thit b: tu theo m ng dng thit bm cn thc hin o v nh gi theo cc khuyn ngh ca ITU-TG.957 hoc G.691 (tng ng vi tiu chun ngnh TCN 68-173hoc TCN 68-177)

i vi cc tham s in ca thit b, h thng: cn c o v nhgi theo khuyn ngh ITU-T G.703 (tng ng vi tiu chun ngnhTCN 68-175)

i vi cc tham s rung pha v tri pha ca thit b, h thng cnc o v nh gi theo cc khuyn ngh ITU-T G.823, G.825(tng ng vi tiu chun ETSI ETSI EN 302 084 v ETSI EN300 462-3 )

i vi cc tham s in quan n ng h ca thit b cn c o vnh gi theo khuyn ngh ITU-T G.812, G.813 tu theo ng h cathit b ch SEC hay SSU (tng ng vi tiu chun ngnhTCN 68-177)

i vi vic o nh gi cht ng i, nn thc hin theo khuynngh ITU-T M.2101 kt hp vi ITU-T G.826 hoc G.828 (trong G.828 nn c p dng i vi cc thit b SDH sn xut sau thng3/2000)


27/52


V cc chc nng khc nh chc nng gim st cht ng th cnc nh gi theo khuyn ngh ITU-T G.783, hot ng chuyn mch

bo v th cn nh gi theo G.841.

ITU-T O.150, O.171/172 v O.181 cc khuyn ngh yu cu v thitb o


28/52

27

CHNG 2. NGHIN CU XY DNG TIU CHUNVRUNG PHA V TRI PHA2.1 Khi nim chung:

Theo ut Tiu chun v quy chun k thut c Quc hi ncCng ha x hi ch ngha Vit Nam kha XI, k hp th 9 thng qua ngy29 thng 6 nm 2006:

Tiu chun quy nh v c tnh k thut v yu cu qun dngm chun phn oi, nh gi sn phm, hng ho, dch v, qu trnh, mitrng v cc i tng khc trong hot ng kinh t - x hi nhm nng caocht ng v hiu qu ca cc i tng ny.

Tiu chun do mt t chc cng b di dng vn bn t nguyn pdng.

Quy chun k thut quy nh v mc gii hn ca c tnh k thutv yu cu qun m sn phm, hng ho, dch v, qu trnh, mi trng vcc i tng khc trong hot ng kinh t - x hi phi tun th bo man ton, v sinh, sc kho con ngi; bo v ng vt, thc vt, mi trng;

bo v i ch v an ninh quc gia, quyn i ca ngi tiu dng v cc yucu thit yu khc.

Quy chun k thut do c quan nh nc c thm quyn ban hnh didng vn bn bt buc p dng.

2.2Yu cu c th i vi quy chun k thut v kt ni mng[1]- Giao din thit b u cui thu bao - mng(v d: giao din 2 dy uvo mng PSTN)- Giao din kt ni mng: mt s giao din c bn, thng s dng ktni mng vin thng gia cc doanh nghip, bao gm:

+ Giao din in v vt (bao gm nhng c tnh k thut v inv vt (nh G.703); c tnh chc nng ca giao din (nh G.704,G.706), cc vn an ton v bo v qua giao din (nh in p nguyhim, nguy c bc x).

+ Giao din quang (cc ch tiu k thut v quang, cc vn anton v bo v qua giao din).

- Cht lng kt ni(cc ch tiu nh: suy hao tng th, thi gian truyndn, ting vng v n nh, mo ng t, chun m ho, mo suy hao,mo tr nhm, suy hao trc m, xuyn m, i, ...).

2.2.1 Giao din kt ni mng

Giao din kt ni mng tp hp nhng thng s k thut v th tc, tiim kt cui mng c s dng cho kt ni cc mng Vin thng vi nhau,

cn thit cho vic cng hot ng v cng nhau cung cp dch v n khchhng ca cc mng i.


29/52

28

2.2.2 Quy chun k thut kt ni mng Vin thng

Quy chun k thut kt ni mng Vin thng cc ti iu k thut a racc yu cu k thut i vi giao din kt ni mng, cht ng kt ni mng,yu cu v ng b v bo hiu.

2.2.3 Phm vi quy chun k thut v giao din kt ni mng

Khi nimQuy chun k thut v giao din kt ni mng cc ti iu k thut a racc yu cu k thut i vi giao din kt ni mng nhm m bo kh nngcng hot ng v kh nng cng cp mt dch v n khch hng ca ccmng i c kt ni. Giao din kt ni mng bao gm:

+ Giao din in v vt (eectrical and physical interface);+ Giao din quang (optica interface).

- Phm vi cc quy chun k thut v giao din in v vt Quy chun k thut v giao din in vt bao gm nhng c tnh k thutv in v vt (nh G.703); c tnh chc nng ca giao din (nh G.704,G.706).- Phm vi cc quy chun k thut v giao din quangQuy chun k thut v giao din quang bao gm nhng c tnh k thut vquang, cc vn an ton v bo v qua giao din.

2.2.4 Phm vi cc quy chun k thut v cht lng kt ni

Quy chun k thut v cht ng kt ni bao gm nhng yu cu truyn dn

v mc tiu cn t c ca kt ni gia h thng cc nh khai thc, ccthng s nh: chun m ho, i,

2.3 Xy dng tiu chun Rung pha/tri pha

2.3.1 c im, tnh hnh i tng tiu chun ha

+ Trong nc:- Hin nay mng vin thng Vit Nam c nhiu nh cung cp dch v, vickt ni mng khng ch vn ca mt nh khai thc, m n cn in quann vic cung cp, chia s ti nguyn mng, nhm khai thc v vn hnh c

s h tng thng tin chung mt cch ti u.- Cc nh khai thc n nh VNPT, Viette, EVN trin khai rng khpcng ngh PDH, SDH/NG-SDH. Cung cp cc giao din kt ni vi khchhng, v vi nhau theo ccchun vin thng quc t v Vit nam.- B Thng tin truyn thng ban hnh v ang xy dng mt s tiu chunnh v:

1. Qui chun quc gia v giao din in, Quang cho cc thit b kt nimng SDH da theo khuyn ngh G.703, G.957,G.691 ch yu qui nhv mc, dng ca xung tn hiu

2. Qui chun v Li bit ca cc ng truyn dn s trn c s r sotchuyn i TCN 68-164: 1998 v Li bt v rung pha ca cc ng


30/52

29

truyn dn s. Phn Rung pha ca TCN 68-164: 1998 do tiu chungc thay i nhiu, nn khuyn ngh bin son mi.3. Qui chun giao din v cht ng knh thu ring 64kbs, 2048kbsv knh thu ring SDH tc STM-1/4/16: Qui nh cht ng ktni

Trong cc Qui chun trn (1,2,3) (cc ti iu tham chiu gc) u thamchiu n Tiu chun v Rung pha v tri pha trc kia c qui nhtrong TCN 68-164: 1998 (hay Khuyn ngh G.825, G.823)- Trong cc ti nghin cu v xy dng tiu chun trc y xcnh: m bo cc thit b s ca nh khai thc kt ni c vinhau v tin ti s thng nht, ng b trong qun cht ng dchv v mng, cn c tiu chun v Mc, v Cu trc khung v v nhthi ca tn hiu ti giao din. C th cn c thm:

+ Tiu chun qui nh v nh thi ca tn hiu ti giao din , bao

gm rung pha v tri pha da theo khuyn ngh ITU-T G.823 cho giaodin PDH 2048 kbit/s v da theo G.825 cho giao din SDH STM-n.+ Ngoi nc:

- Cc t chc chun quc t nh ITU v ETSI cng mi cp nht cctiu chun v phn cp s PDH/SDH chng hn:

* khuyn ngh ITU G.823 The control of jitter and wanderwithin digital networks which are based on the 2048 kbit/s hierarchy.

* khuyn ngh ITU G.825 The control of jitter and wanderwithin digital networks which are based on the synchronous digital

hierarchy (SDH)* tiu chun ETSI EN 302 084: The control ofjitter and

wanderin transport networks- Cc hng cung cp thit b PDH/SDH cng u cng b tun th theotiu chun/ khuyn ngh ITU v ETSI.- Cc nh qun trn th gii cng a chn v p dng cc tiu chunny nh ESTI, EU, IDA singapore, .cho vic p dng v kt ni giacc h thng v dch v.

i tng chun ho:Cc tiu chun/ qui chun Vit nam v quc t mi nht u tham chiu n

cc khuyn ngh G.823 v G.825. Cc tiu chun G.823 v G.824 a ra ccyu cu v gii hn rung pha v tri pha cho 2 oi giao din/tn hiu:- Giao din cp tn hiu u ng, truyn ti dch v: Cc yu cu cho giaodin ny cng c yu cu trong cc qui chun v giao din kt ni, chtng kt ni.- Giao din cp tn hiu ng b: oi giao din ny thng khng c yucu trong kt ni in mng gia cc nh khai thc.

2.3.2 L do v mc ch

L do:


31/52

30

Cn b sung thm tiu chun qui nh v thi gian ca tn hiu (rung pha vtri pha), phc v cho vic trin khai p dng cng ngh, m bo s ktni thit b gia cc nh khai thc v cung cp dch v cho khc hng.

Ngoi ra, cc tiu chun v ng b cng cn thit c a ra hng dncho cc nh khai thc trin khai trong ni mng.

Vic nghin cu, xy dng tiu ny da trn vic r sot cc tiu chun trongnc, ng thi r sot da trn cc khuyn ngh quc t, xy dng tiu chunph hp vi mng vin thng Vit Nam.Mc ch:Xy dng c bn d tho Tiu chun m s c cho vic nh gi, m

bo kt ni gia cc thit b v gia cc mng da theo phn cp s ( tiuchun cho kt ni mng); cng nh gia thit b khch hng vi nh cung cpdch v knh thu ring (tiu chun cho dch v)v cc yu cu k thut chonh khai khai thc mng trin khai nng cao cht ng mng i

2.3.3 S c v phng php xy dngtiuchun

Khi xy dng Tiu chun cht ng v Rung pha/ tri pha, nhm ch tr datrn c s tiu chun ETSI v khuyn ngh ITUv Rung pha v tri pha.

* khuyn ngh ITU G.823 The control ofjitter and wander withindigital networks which are based on the 2048 kbit/s hierarchy; 3/2000* khuyn ngh ITU G.825 The control of jitter and wander withindigital networks which are based on the synchronous digital hierarchy

(SDH); 03/2000V bn sa i nm 13 August 2001, v b sung n 1 05/2008* tiu chun ETSI EN 302 084 V1.1.1: The control of jitter andwanderin transport networks, 2/2000* tiu chun EN 300 462-3-1 V1.1.1 The control ofjitter and wanderwithin synchronization networks; (1998-05)

vi mt s do c bn sau:1. Chng 1 cho thy cc tiu chun Ngnh v Vit nam hin nay u da

theo chun ITU option ETSI

2. Cu trc ca khuyn ngh ITU a ra cc ch tiu cho h thng PDH(G.823) v SDH (G.825) bao gm c v giao din u ng v ngb. Trong khi ETSI a ra hai tiu chun v giao din u ngETSI EN 302 084 v ng b ETS 300 462-3.

3. Phn tch cc tiu chun cho thy, cc ch tiu k thut trong ETSI EN302 084 v ETS 300 462-3 tng ng cng c cc ch tiu k thut nhtrong cc khuyn ngh ITU G.823 v G.825. Hai khuyn ngh ny chnh bn mi hn v c pht trin, chp thun t cc tiu chun tngng do ETSI xut.

4.

Cc yu cu v rung pha v tri pha ti giao din mng, dch v phntn hiu u ng c qui nh bt buc trong cc yu cu Qui chunv giao din in/ quang v knh thu ring trong tham chiu n


32/52

31

G.823/G.825. Do , cc phn tng ng vi giao din u ng caTiu chun bt buc.

5. Tuy nhin, hin nay Vit nam v trn Th gii, gia mng ca ccnh khai thc mng khc nhau thng hot ng trng thi cn ng

b, tc khng qui nh bt buc nh khai thc mng ny phi cp

ng b cho thit b ca cc nh khai thc khc.6. V vy, ti xut xy dng trn c s p dng tiu chun v rungpha v tri pha phn tn hiu u ng v ng b cho cc giao dinang c s dng ph bin hin nay Vit nam nh 64kbps,2048kbps,... v STM-n. ph hp hn vi thc t v c c btiu chun thng nht, ti thc hin thm cc yu cu ngoi cng nh cc tc : 8 Mbit/s, 34 Mbit/s, 140Mbit/s v STM-256

Trn c s r sot cc tiu chun Vit nam v quc t in quan n Rung pha

v tri pha, cng nh tham kho cc phng php xy dng cc tiu chun/qui chun v giao din, kt ni, nhm ti khuyn ngh xy dng Tiuchun ny theo phng php chp thun ni dung tiu chun G.823 &G.825; v s dng cc la chn theo phn cp 2048Kbit/s ph hp mngli v tiu chun ho Vit nam

Tn tiu chun xut :

GII HN RUNG PHA V TRI PHA TRONG MNG S THEO

PHN CP S NG B (SDH V PHN CP 2048kbit/s

The control of jitter and wander within digital networks which are based onthe synchronous digital hierarchy and 2048 kbit/s hierarchy

2.3.4 Cu trc Tiu chunDa tho tiu chun c cu trc theo hng dn tm thi mi nht ca VKHCN - B thng tin v truyn thng bao gm:Li ni u

1 Phm vi p dng

2 Ti iu vin dn

3 Thut ng v nh ngha

4 K hiu v thut ng

5 Gii hn mng ca rung pha v tri pha u ra ti cc giao din u ng

6 Gii hn mng ca rung pha v tri pha ura ti cc giao din ng b

7 Dung sai rung pha v tri pha u vo ti cc giao din mng

PH LC A - M hnh mng cho gi tr gii hn mng ng bPH LC B - Tham s vm hnh tham chiu tri pha.


33/52

32

PH LC C Tnh ton gii hn tri pha cho mng truyn ti SDH

PH LC D - Phng php o tri pha u ra.

PH LC E - Hng dn o dung sai rung pha v tri pha u vo.

PH LC F - Phng php o rung pha u ra.


34/52

33

Bng 2-1 Bng i chiu tiu chun vin dn

TCVN xxx-2009 Ti liu gc:

G.823, G.825

Sa i, b sung:

Chp thun ni dung ca

G.823 v G.825 (oii

cc option 1544 kbit/s )

1. Phm vi p dng 1./G.823 v 1./G.825 Chp thun v loi i

cc option 1544 kbit/s

cho ph hp

2. Ti iu vin dn 2./G.823 v 2./G.825 Chp thun v thay th

bng cc TCVN, QCVN

hin c

3. Thut ng v nh ngha 3./G.823 v 3./G.825 Chp thun nguyn vn

4. K hiu v thut ng 4./G.823 v 4./G.825 Chp thun nguyn vn

5. Gii hn mng ca rung pha v tri pha u ra ti cc giao din u ng

5.1 Cc gii hn mng ca rung pha u ra 5.1/G.823 v 5.1/G.825 Chp thun nguyn vn


35/52

34

5.2 Gii hn mng ca tri pha u ra

5.2.1 Gii hn tri pha u ra ti giao din 2048 kbit/s 5.2.1/G.823 Chp thun nguyn vn

5.2.2 Gii hn tri pha u ra ti giao din 34368 kpbs 5.2.2/G.823 Chp thun nguyn vn

5.2.3 Gii hn tri pha u ra ti giao din 139264 kpbs 5.2.3/G.823 Chp thun nguyn vn

5.2.4 Gii hn tri pha u ra ti giao din STM-N 5.2/G.825 Chp thun nguyn vn

6. Gii hn ca rung pha v tri pha u ra ti cc giao din ng b 6./G.823 Chp thun nguyn vn

6.1 Cc gi tr gii hn mng cho rung pha u ra ti cc giao din ng b. 6.1/G.823 Chp thun nguyn vn

6.2 Cc gii hn mng cho tri pha u ra ti cc giao din ng b. 6.2/G.823 Chp thun nguyn vn

7. Dung sai rung pha v tri pha ca cc giao din mng

7.1 Dung sai rung pha v tri pha ca cc giao din u ng

7.1.1 Dung sai rung pha v tri pha u vo ti giao din 64kbit/s 7.1.1/G.823 Chp thun nguyn vn

7.1.2 Dung sai rung pha v tri pha u vo ti giao din 2048kbit/s 7.1.2/G.823 Chp thun nguyn vn

7.1.3 Dung sai rung pha v tri pha u vo ti giao din 8448 kbit/s 7.1.3/G.823 Chp thun nguyn vn




36/52

35

7.1.6 Dung sai rung pha v tri pha u vo ti giao din STM-N 6.1/G.825 Chp thun nguyn vn

7.2 Dung sai rung pha v tri pha ca cc giao din ng b 7.2/G.823 Chp thun nguyn vn

PH LC A(Qui nh) - M hnh mng cho gi tr gii hn mng ng b Annex A /G.823 Chp thun nguyn vn

PH LC B (Qui nh) - Tham s v m hnh tham chiu tri pha Annex B /G.823 Chp thun nguyn vn

PH LC C (Tham kho) Tnh ton gii hn tri pha cho mng truyn ti SDH Appendix I/G.823 Chp thun nguyn vn

Phc c D (Tham kho): Phng php o tri pha u ra Appendix II/G.823 Chp thun nguyn vn

PH LC E(Tham kho):Hng dno dung sai rung pha v tri pha u vo Appendix III /G.823 Chp thun nguyn vn

PH LC F (Tham kho): Phng php o rung pha u ra ITU-T O.171/ Appendix

I/ I.6.1 Output jitter

measurements

chp thun phn o

giao din mng

Cc ni dung cn i ca 2 ti iu gc G.823, G.825 khng c s dng trong TCVN

6.2/G.825 Jitter and

wander generation

6.3/G.825 Jitter and

wander transfer

Khng s dng, v ni

dung ch tham chiu

n Khuyn ngh khc

G.783, G.812 v G.813;

c phm vi cho cc thit


37/52

36

b ring; v dn n b

cc khng ph hp khi

kt hp vi G.823.

Appendix I/G.825

Relationship between

network interface jitter

requirements and input

jitter tolerance

Khng s dng, v l

thng tin tham kho

cho r v mi quan hcc tham s rung pha

u vo v u ra

Appendix II/G.825

Measurement

methodology for output

wander of synchronous

interfaces

Ging 1 phn ni dung

ca Appendix II/G.823;

gp vo ph lc D

Appendix III/G.825

SDH Line systems and

Interworking

implications

Khng s dng, v l

thng tin tham khocho r v cc tham s

ca mc 6.2 v

6.3/G.825 trn v


38/52

37

khng c a vo

TCVN theo l do trn.


39/52


KHUYN NGHP DNG

- Hin nay, chng ta c cc qui chun vgiao din vt v knh thu ringnx 64, 2048 kbit/s v SDH. Cc qui chun ny u tham chiu n cc yu cuv rung pha/ tri pha ca tn hiu trong cc khuyn ngh, tiu chun quc t. Do, m bo cc thit b s ca nh khai thc kt ni c vi nhau v tinti s thng nht, ng b trong qun cht ng dch v v mng, khuynngh cn c GII HN RUNG PHA V TRI PHA TRONG MNG STHEO PHN CP S NG B (SDH) V PHN CP 2048kbit/s trn cs p dng tiu chun, khuyn ngh ITU v ETSI, phc v cho vic trin khaip dng cng ngh, m bo s kt ni thit b gia cc nh kha i thc v cungcp dch v cho khc hng.- t c mc tiu v ni dung ca cng, nhm thc hin ti thchin:

+ R sot, nghin cu cc tiu chun v Rung pha v tri pha: m r ctnh hnh chun ho trn th gii v Vit nam. C th, cc tiu chun Vitnam c bin son ch yu da theo khuyn ngh ITU v tiu chun ETSI;+ Tm hiu cc yu cu v qui chun/ tiu chun ca Vit nam v kt nimng+ Xy dng d tho GII HN RUNG PHA V TRI PHA TRONGMNG S THEO PHN CP S NG B (SDH) V PHN CP

2048kbit/s da trn chp thun nguyn vn khuyn ngh ITU-T G.823,G.825bao gm cc yu cu ti thiu v Rung pha/tri pha ti giao din u vo,u ra, v cc phng php o cc tham s cht ng tng ng.

- Cng vi cc qui chun v knh thu ring, v giao din in v quangPDH/SDH, Nhm ti khuyn ngh p dng d tho tiu chun ny Vitnam, p ng yu cu qun Nh nc v nhu cu pht trin mng, dch vhin ti cng nh trong tng ai Vit nam. C th :

+ Giao din ch truyn ti dch v, u ng: Cc yu cu cho giao dinny cng c yu cu trong cc qui chun v giao din kt ni, cht

ng kt ni knh thu ring. Do cc yu cu v rung pha v tri phacho oi giao din ny c tnh bt buc.+ Giao din c cp tn hiu ng b: oi giao din ny thng khngc yu cu trong kt ni in mng gia cc nh khai thc. Cc doanhnghip nn s dng cc ch tiu v m hnh tham chiu tng ng nh gi cht ng mng. Khi c nhu cu cung cp tn hiu ng b giacc nh khai thc hoc khch hng, th c th s dng cc m hnh v chtiu cho giao din oi ny m c s nh gi kt ni ng b.+ Trong qu trnh o kim nh gi cn tun theo cc yu cu v cc

hng dn o trong ccph c ca tiu chun v thit b, phng phpo cn m bo theo khuyn ngh ITU-T O.171/172.


40/52


PH LC A: Phng php o rung pha/tri phaVic nghin cu phng php o cho cc thit b v h thng SDH c th thamkho mt s cc ti, c th nh sau:

- ti 20-95-KHKT-RD K thut o trong h thng SDH- ti 139-95-KHKT-RD Nghin cu k thut o th v gim st h

thng SDH n 2,5 Gbit/s

- ti 146-95-KHKT-TC Qui trnh o th nghim thu tuyn thng tinquang SDH tc 622 Mbit/s v 2.5 Gbit/s

- ti 013-97-TCT-R Nghin cu phng php o nh gi cht ngcc h thng thit b v tuyn truyn dn quang SDH khi nghim thu v

bo dng- ti 014-2003-TCT-RDP-VT-62 Nghin cu a chn tiu chun ng

b v xy dng cc bi o kim cht ng ng b mng vin thng caVNPT

- ti M s: 078-2004-TCT-TDP-VT-44, NGHIN CU XY DNGCC BI O KIM HO MNG THIT B U CUI CP QUANGSDH TRN MNG VIN THNG CA TNG CNG TY

V vy, trong phn ny chng ti ch tm tt mt s thuyt c bn v nhng

iu cn u khi thc hin o

A.1 Gii thiuRung pha s iu ch pha gi khng mong mun ca mt tn hiu xung, xuthin trong truyn dn s v s bin i nh cc thi im c ngha ca tnhiu so vi cc thi im tng ca chng.

Khi rung pha xut hin, thi im chuyn mc ca mt tn hiu s s sm hnhoc mun hn so vi tn hiu chun.

Cc tham s c trng cho rung pha ca tn hiu s bin v tn s. Bin xc nh tc thi ca xung tn hiu so vi v tr tng ca n. Tn s thhin s thay i nhanh chm ca ch tc thi so vi v tr tng caxung theo thi gian. Nu bin ca dao ng pha theo thi gian mt tn hiuc chu k vi tn s n hn 10Hz, th dao ng ny c coi nhanh v gi rung pha. Trong thc t, th dao ng v pha ny thng khng phi mt tnhiu c chu k, v vy cn phi phn tch s c mt ca cc thnh phn ph

trong di ph ca n n hn hoc nh hn 10 Hz xc nh rung phahay tri pha


41/52


42/52


Bi v cc tn hiu c kiu khc nhau s c thnh phn ph khc nhau, cho nnvic a chn tn hiu th s nh hng rt n n kt qu o. i vi cc giaodin PDH, cc mu tn hiu o c qui nh trong O.151 v c tng kttrong bng di y:

Bng A-1 Cc mu tn hiu o rung pha cho cc giao din PDH

Stt Tc (Mbit/s) Mu tn hiu th

1 2 215-1

2 34 223-1

3 140 223-1

i vi cc tn hiu SDH, v cc tn hiu ny c trn ngay trc khi truynnn khng cn thit ch ra cc mu tn hiu o ring cho cc php o rung pha,mc d hu ht cc tn hiu o chc chn s mt s oi ti o c cu trc(TSS1 - TSS8)

- lch tn s:Trong mt s php o, c th xem xt trong trng hp xu nht, cn phi

pht tn hiu b rung pha c ch tn s n ti gi tr dng/m cc i chophp ti thit b cn o. Bng di y tng kt ch tn cc i i vi cctc khc nhau (t cc khuyn ngh G.703, G.813, G.783)

Bng A-2 lch tn cc i i vi cc tc khc nhau

Stt Tc (Mbit/s) ch tn danh nh (ppm)

1 2 50

2 34 20

3 140 15

A.2o Rung phati cc giao din raPhp o ny xc nh bin Rung pha (tnh bng UIpp) xut hin ti cng raca h thng (thit b) SDH. Gii hn cc i ca gi tr ny c qui nh trong

khuyn ngh G.823 v G.825. Gi tr Rung pha ti u ra ny c th sinh ra dobn thn thit b hoc do rung pha t cc u vo (c th u vo d iu hoc


43/52


u vo ng b) c truyn n u ra ca thit b. Trong trng hp mun

xc nh Rung pha ni ti ca thit b th tn hiu a n thit b phi tn hiukhng b Rung pha.

A.3o rung phacho php ti giao din u voCc thit b SDH phi c thit k c kh nng chp nhn mt ng Rungpha nht nh ti u vo mkhng gy mt ng b hoc khng to ra bt ks bt thng no. Kh nng c th hin qua gi tr rung pha cho php tigiao din u vo thit b (hay cn gi dung sai rung pha). V vy, dung sairung pha c nh ngha bin rung pha n nht ti u vo ca NE mkhng gy ra bt k s bt thng no v bit hay bt thng no v ng b.Gi tr ny c qui nh trong khuyn ngh G.823 (PDH), G.825 v G.958

(SDH).

Php o dung sai rung pha c thc hin bng cch chn cc rung pha hnh sinti cng u vo. Bin ca rung pha to ra c tng n cho n khi c skin xut hin ti cng ra ca thit b cn o. Qu trnh ny c p i ti cctn s khc nhau. C 2 cch thc hin php o ny: da trn s bt u xuthin i bit, v da trn thit thi v BER. (u , khi thc hin php o ny

phi ni thit b cn o v thit b o n mt ngun ng b chung trnh xy

ra hin tng dch chuyn con tr trong qu trnh o)a. Da trn s bt u xut hin li bit (onset of error)Phng php ny thch hp cho vic o hu ht cc oi phn t mng. Thngc s dng kim tra xem cc chc nng m v khi phc tn hiu cockca NE c hot ng chnh xc hay khng. Php o c thc hin nh sau:tng bin rung pha cho n khi quan st thy s suy gim cht ng tn mt ngng nht nh (v d ngng khuyn ngh trong O.171 cho tn hiu

PDH 2s vi cc bt thng xy ra theo chu k 30s). Ti im ny, gi tr bin rung pha c ghi i v cho chng ta gi tr rung pha cho php ti u voi vi tn s . Php o c p i ti cc tn s khc nhau.

b. Da trn thit thi v BERi vi cc h thng ng truyn (trm p) th phng php ny thch hphn (thng s dng giao din quang). Trong trng hp ny, gi tr rung phacho php ti u vo c xc nh khi s suy gim cht ng t n mctng ng vi vic gim qu cng sut truyn dn i 1 dB (O.171). Php ony c thc hin ti cc tn s khc nhau.


44/52


PH LC B: GII THIU MT STHIT BO

B.1Yu cu chungTrong qu trnh o nh gi cht ng SDH, cc thit b o c s dng nh mt thit b chun so snh khi o kim, m bo tnh tng thch gia ccthnh phn khc nhau ca h thng. Ngoi ra thit b o cng c s dng m phng cc iu kin kht khe c th c trong khi trin khai SDH, nht trong mi trng c nhiu nh cung cp thit b. V vy, thit b o phi m

bo cc yu cu sau:

- My o phi m bo cc chc nng khi s dng trong mi trngPDH/SDH

- C cc chc nng o nhanh v t ng c th thc hin mt chui ccphp o nhanh. Phn mm ca h thng o hin nay c th thc hin ccphp o mt cch d dng v nhanh chng. Ngn ng p trnh n gin vd s dng thng ngn ng hng i tng, cho php p trnh bnggiao din ho thng qua cc khi, cc modu, biu tng... khc hn vingn ng p trnh tun t truyn thng rt phc tp

- My o c kh nng m rng thm chc nng mt cch d dng, c kh nngcp nht c cc ch tiu, cc tiu chun nh gi trong tng ai

- C giao din ngi s dng thch hp, d s dng, d nh- C kh nng u tr thng tin n khi thc hin php o trong thi gian di- C cu trc modu cho php cc t hp mm do v kh nng nng cp m

rng c phn cngn phn mm mt cch d dng.

Hin nay, bn cnh mt s thit b o thc hin cc chc nng n v d nhc oi thit b ch thc hin chc nng phn tch khung, c oi thit b ch thchin php o BER th c rt nhiu thit b o SDH c th thchin y cc

bi o SDH nu. c th thc hin y cc bi o ny th thit b oSDH phi m bo cc chc nng sau:

- C kh nng to v phn tch cc tn hiu STM-N c cu trc c qui inhtrong ITU-T G.707

- C kh nng pht cc cu trc tn hiu th khc nhau TSS1- TSS8 theo nhqui nh trong O.181

- C th thc hin m phng v nh gi cc byte trong SOH/POH


45/52


- To v phn tch cc bt thng v sai hng- C kh nng chn i bit B1, B2, B3- To chui th con tr theo G.783 v phn tch hot ngca con tr- C kh nng o v nh gi i bit theo G.826, G.828, G.829 v M.2101- C kh nng to/phn tch tri pha/Rung pha theo ITU-T G.783, G.823,

G.825, O.171, O.172

Bn cnh thit b o SDH thit b o chnh, trong qu trnh o ho mng thitb SDH cn cn phi c s h tr ca cc thit b o khc thit b o cngsut quang v cc b suy hao quang. i vi cc thit b ny yu cu quan trngnht phi c kh nng m vic ti bc sng ca thit b SDH cn o, v yucu th 2 ca thit b di ng ca thit b phi n.

B.2 Mt s thit b oTrong phn ny, ti s gii thiu mt s thit b o c s dng trong qutrnh o nghim thu thit b u cui quang SDH

B.2.1Thit b ANT-20ATN-20 thit b do PDH/SDH vi cc ctnh k thut nh sau:

Cc giao din in:C cc giao din PDH tun theo ITU-T G.703, vi tc

v m ng truyn nh sau:- 2048, 8448 v 34368 kbit/s: HDB3- 139264 v 155520 kbit/s CMI- Dung sai tc bit: c th iu chnh n mc 500 ppm vi

bciu chnh 0.001 ppm

Giao din quang: tun theo ITU-T G.957

Cu trc tn hiu STM-N:

- Thit b c kh nng to ra tn hiu STM-1N tun theo ITU-T G.707- Vi cc cu trc tn hiu th tun theo O.181- Ni dung ca cc byte SOH v POH: ni dung ca tt c cc byte (tr cc

byte B1/B2/B3 v H1H4) c th p trnh c tu theo mc ch cangi s dng vi bt k byte hoc chui byte (c chn vo trongkhung STM-N)

Cc ch o t ng:


46/52


- Cu hnh t ng: ch ny ANT-20 c t ng thit p theo tnhiu u vo.

- Chc nng qut t ng: chc nng ny cho php nhanh cho ngs kimtracu trc tn hiu, kiu sp xp c s dng, nhn dng vt v phn ti tinthm ch ngay c trong trnghp sp xp hn hp

- Chc nng t ng qut s c: chc nng ny cho php kim tra tt c ccknh C11 hoc C12 qua AU-3 v AU-4 trong tn hiu SDH. B thu ANT-20 kim tra cc cnh bo trong tn hiu thu c, cu trc tn hiu SDH vtt c cc knh. Kt qu (t/khng t) c a ra. C th hin th chs cnh bo chi tit ca tng knh

Cc php o thc hin c:

- Chn v pht hin i bit- i vi tn hiu SDH: i chn B1, B2, B3, i tn hiu ng b

khung, MS-REI, HP-REI, i bit trong mu th, i m (cc i n)

hoc i bit vi t t 2.10-310-10

- i vi tn hiu PDH: i bit, i FAS, i m (i n) hoc i bitvi t t 10-210-9

- Phn tch hot ng con tr. Cc tham s hin th bao gm:- S n hot ng con tr: s n tng, gim, tng (tng + gim)- Gi tr con tr

- C kh nng to v phn tch hot ng con tr ti mc AU v TU mtcch ng thi:

- Hot ng con tr theo G.783 vi bc con tr c th p trnhc

- C th thc hin tng hoc gim con tr- C th to ra cc con tr n- C th thit p gi tr con tr- Hin th s n hot ng con tr: s n tng, gim, tng (tng +

gim)

- Hin th gi tr con tr- o tn s cock: ch tn s cock ca tn hiu u vo so vi gi tr

danh nh c hin th theo ppm


47/52


- To v pht hin cnh bo: tt c cc cnh bo uc nh gi v hin thsong song:

- i vi tn hiu SDH: LOS, LOF, HP-PLM, MS-AIS, HP-UNEQ,HP-RDI

- i vi tn hiu PDH: LOS, LOF, AIS, RDI- nh gi SOH v POH: thit b ANT-20 c th hin th ton b cc thng

tin trong SOH v POH

- Nhn bit theo di vt ung:- J0, J1, J2: chui ASCII 16 byte p trnh c- J1, J2: chui ASCII 64 byte p trnh c- H4: chui 4 hoc 48 byte

- o v nh gi i bit theo ITU-T G.821, G,826, M.2100- To v phn tch Rung pha theo G.783, G.823, G,825, O.171, O.172. Vi

cc php o c th thc hin c bao gm:

- o v ghi i gi tr rung pha UIpp theo thi gian- o Rung pha theo gi tr RMS- o cc gi tr TIE, MTIE, TDEV- Cc chc nng o t ng:

i. T ng xc nh hm truyn t Rung phaii. T ng so snh gi tr dung sai rung pha cc i vi cc mt

n dung sai Rung pha chun ca ITU-T hoc ANSI

iii. T ng to chui con tr o rung pha kt hpiv. T ng so snh gi tr dung sai tri pha cc i vi cc mt

n dung sai tri pha chun ca ITU-T hoc ANSI

- o cc knh ATM- To v o i bit (ca AAL-0, AAL-1)- Phn tch cht ng ATM (t i t bo, t mt t bo, tr

truyn dn t bo trung bnh, s thay i tr truyn dn t bo...)

- To v pht hin cnh bo (LCD, VP AIS, VP RDI, VP AIS+ VCAIS, VC I, VC RDI, VP RDI+VC RDI)

Khong thi gian o:

- C th thay i c: t 1s n 99 ngy


48/52


- Thi im bt u v kt thc o: c th c thit p nhn cng hoct thi gian t ng

Chui tn hiu th:thit b ANT-20 c kh nng to ra cc chui tn hiu thc cu trc hoc khng c cu trc:

- Chui bit gi ngu nhin: 211-1, 215-1, 220-1, 223-1- T p trnh c: 16 bit

B.2.2 Thit b o SF-60 v SFO-60Thit b SF-60 thit b phn tch i v o rung pha i vi cc h thng thngtin s t 48 kbit/s n 175 Mbit/s.

SF-60 c s dng o kim tra i vi cc h thng PDH, SDH v ISDN.

Thit b c SF-60 c th thc hin cc chc nng sau:- Pht v o Rung pha trong phm vi tc t 48 kbit/s n 175 Mbit/s- Kim tra chc nng MUX-DEMUX: vic nh gi chc nng ny cthc hin theo cc tiu chun tng ng ca ITU-T. SF-60 c th pht v

phn tch cu trc khung, cu trc ti tin ca cc tn hiu cn ng b vng b

- SF-60 c kh nng to i v cc cnh bo kim tra cc hot ng cnhbo ca thit b

SFO-60 cng thit b o SDH c cc chc nng nh phn tch cht ng tnhiu, kim tra i, rung pha, .... Tuy nhin thit b ny c kh nng cc giao dinc tc t ti STM-4 v STM-16.

B.2.3 HP E1725C.Thit b o tn hiu ng h HP Agient E1725C kt hp kh nng y munhanh vi b nh n 512K v cc kh nng phn tch tin tin khc. Cc phn

mm i km vi thit b ny cho php cu hnh thit b cho ph hp vi cc ngdng c th. Vi thit b E1725C, ta c th thc hin cc php o v cc phntch trn cc thit b u tr d iu, o rung pha ca khung SDH/SONET, rungpha ng h, v cc php o ng b mng khc. HP Agient E1725C c thitk ph hp cho vic tch hp vi modue o tn hiu ng h HP AgientE1740A vi mt my tnh iu khin bn ngoi chy trn nn Windows, t rong giao din ca Windows s ng vai tr thit p v iu khin cc tham s.

Ch tiu k thut:


49/52


Hin th ph rung pha theo FFT cho php pht hin i nhanh. C kh nng hin th nhiu hnh nh phn tch d iu di nhiu gc

khc nhau.

phn di < 100 ps (gi tr hiu dng). Di tn s : n n 150 MHz. Kch thc b nh: 512K


50/52


TI LIU THAM KHO[1] HNG DN THC HIN TI XY DNG TIU CHUN, V

KHOA HC - CNG NGH[2] R SOT, CHUYN CC TIU CHUN NGNH SANG QUI

CHUN K THUT V TIU CHUN VIT NAM, M s: 95 06KHKTTC :

R sot Tiu chun ngnh TCN 68-160:1996: Tiu chun cp siquangYu cu k thutR sot Tiu chun ngnh TCN 68-173:1998: Giao din cho ccthit b v h thng truyn dn SDH Yu cu k thut

R sot Tiu chun ngnh TCN 68 - 139:1995: H thng thng tincp si quang - Yu cu k thutR sot Tiu chun ngnh TCN 68 - 177:1998: H thng thng tincp quang v vi ba SDH -Yu cu k thut

[3] R SOT, CHUYN CC TIU CHUN NGNH SANG QUYCHUN K THUT V TIU CHUN VIT NAM (NHM BOHIU, NG B), M S: 93-06-KHKT-TC:

R sot tiu chun ngnh 68-163:1997 H thng bo hiu s 7

Yu cu k thut (phn c s)R sot tiu chun ngnh TCN 68-163A:1997 H thng bo hiu s7Yu cu k thut (phn MTP)R sot tiu chun ngnh TCN 68-163B:1997 H thng bo hiu s7Yu cu k thut (phn ISUP)R sot tiu chun ngnh TCN 68-172:1998 Giao din kt ni mng

Yu cu k thutR sot tiu chun ngnh TCN 68-175:1998 Cc giao din in

phn cp s - yu cu k thutR sot tiu chun ngnh TCN 68-164:1997 Li bt v rung pha cacc ng truyn dn s Yu cu k thut v quy trnh o kimR sot tiu chun ngnh TCN 68-171:1998 ng h ch trongmng ng b Yu cu k thutR sot tiu chun ngnh TCN 68-169:1998 H thng bo hiu R2

Yu cu k thut[4] EUROPEAN COMMISSION, Possible Revision of the Commission

Decision on the minimum set of leased lines ,Brussels, 3 March 2004

[5] COMMISSION DECISION (2003/548/EC) of 24 July 2003 on theminimum set of leased lines with harmonised characteristics and


51/52


associated standards referred to in Article 18 of the Universal ServicesDirective

[6] Nguyn Minh Dn, V Hong Sn, K thut o trong Thng tin quang,nh xut bn Bu in, 12-2002.

[7] ti : 078-2004-TCT-TDP-VT-44:Nghin cu xy dng cc bi okim ho mng thit b u cui cp quang sdh trn mng vin thng catng cng ty

[8] ti 20-95-KHKT-RD K thut o trong h thng SDH[9] ti 139-95-KHKT-RD Nghin cu k thut o th v gim st h

thng SDHn 2,5 Gbit/s

[10] ti 146-95-KHKT-TC Qui trnh o th nghim thu tuyn thng tinquang SDH tc 622 Mbit/s v 2.5 Gbit/s

[11] ti 013-97-TCT-R Nghin cu phng php o nh gi chtlng cc h thng thit b v tuyn truyn dn quang SDH khi nghim thu v bo dng

[12] ti 014-2003-TCT-RDP-VT-62 Nghin cu la chn tiu chunng b v xy dng cc bi o kim cht lng ng b mng vinthng ca VNPT

[13]Qui trnh o bo dng thit b FLX 150/600[14]Jose M. Caballero Installation and Maintenance of SDH/SONET,

ATM, xDSL, and Synchroniztion Network, 2003 Artech House.

[15]G.703 (4/91) Physical/electrical characteristics of hierarchicaldigital interfaces.

[16]G.707 (3/96) Network node interface for the synchronous digitalhierarchy (SDH).

[17]G.825 (3/93) The control of jitter and wander within digitalnetworks which are based on the synchronous digital hierarchy (SDH).

[18]G.826 (1996) Error performance parameters and objectives forinternational constant bit rate digital paths at or above the primary rate.

[19]G.957 (7/95) Optical interfaces for equipment and systems relatingto the synchronous digital hierarchy (SDH).

[20]prETS 300 147 (11/96) Transmission and Multiplexing (TM);Synchronous Digital Hierarchy (SDH); Multiplexing structure.


52/52

[21]ETS 300 166 (1993) Transmission and Multiplexing (TM); Physicaland electrical characteristics of hierarchical digital interfaces forequipment using the 2048 kbit/s based plesiochronous or synchronousdigital hierarchies.

[22]ETS 300 417-1-1 (1996) Transmission and Multiplexing (TM);Generic functional requirements for Synchronous Digital Hierarchy(SDH) equipment, part 1: Generic processes and performance.

[23]ETS 300 417-2-1 (1996) Transmission and Multiplexing (TM);Generic functional requirements for Synchronous Digital Hierarchy(SDH) equipment, part 2 : Physical section layer functions.

[24]ETS 300 417-3-1 (1997) Transmission and Multiplexing (TM);Generic requirements of transport functionality of equipment; Part 3-1:Synchronous Transport Module-N (STM-N) regenerator and multiplexsection layer functions.

[25]ETS 300 417-4-1 (1997) Transmission and Multiplexing (TM);Generic requirements of transport functionality of equipment; Part 4-1:Synchronous Digital Hierarchy (SDH) path layer functions.

[26]IEC 874-13 (1993) Connectors for optical fibres and cables - part13: sectional specification for fibre optic connector - type CF08.

[27]EN 60950 (1992) Safety of information technology equipmentincluding electrical equipment. .

thuyết minh giới hạn rung fa, trôi fa

Documents