ҵ˾ͨרҵ
临ã
1ж
1SDHв˾ָ뼼֧·źŸóɸźṣ̌
2VC4Ϊ9*261*8*8000150.336Mbpṣ
3TTFն˹ܿ飩VC-4źŵSTM-Nźŵת䡣̣
4߽׽ָVC-4Ľ, ͽ׽ָVC-3/VC-12Ľ档̣
5STMNźŵΪŵNRZ
6˸öα˵1+1111ʽУεֵ4̣
7˫˫öαҵ˫öλҵͬ
8ָܼϵͳУ⹦ܶԽŵԽС˵ķЧӦԽء̣
9ԪDCCͨǴͨš
10SDHͨʱ϶ʱȸöαߡ
11PDHðָӣûȫͳһĽӿڱ׼
ϵͳĸӡֽӹ̣µϻԭĶ̣
12Ҫʵ̣ͬ
13A13ߵ8εȸΪ-12dḄ
14AMI벻ڶʱӵȡ̣
15˥ƵָЧƵ300Hz3400Hzھ˥ƽĹϵ
16PDHõָӷһΪ첽ӡ̣
17PCM30/32·ϵͳУ֡ͬϵͳ2ͬ֡δյ֡ͬ룬ϵͳʧ
18PCM30/32·ϵͳĸ֡ͬ0000̣
19PCM30/32·ϵжȺܴĻ·Ϊ480·
20ʱֶ·ϵͳΪ˱֤·źռòͬʱ϶䣬Ҫն뷢ͬƵͬ򣬼ʱҪϸ̣ͬ
21СźŵȦɱAɴ󣬴źŵȦɱAС̣
2ѡ⣨ѡͶѡ⣩
1SDHͬʽУʵӦͬõǣ B  
A첽ʽ 				Bͬʽ
C׼ͬʽ				Dαͬʽ
2óTMԪSDH豸صǣ A C 
AйⷽTMҵ
Bֻһⷽ
CͬⷽҵֱͨӴͨ
Dʱ622M
2SDHĴ·ǣA
ADCCͨ·
BFCCͨ·
CKCCͨ·
DE1ֽ
3AUָã A C 
AԸ߽VC䣬ӦAUƵ
BԵͽVC
Cָʾ߽VCֽAUеλ
DָʾͽVCֽTUеλ
5˫öα˫öιȣصǣ A C 
Aҵӱ
BöԪԴ16
CʧЧ
Dʱ졣
6EDFAڽͷŴǣ C 
A??????			Bָ
C˲??????			D˥
7SDHϵммعܵʵɣ A D 
Aοͨ
B·
C֡ṹеTS0TS15ʱ϶
DDCCͨ
8豸ýУA B D
ATM      					BADM
CREG         			DDXC
9ͨĴǣ   D   澯
AMS-AIS    				BMS-RDI
CLOS     					DTU-AIS
10ͨмйȷ:(  D  )
A.Ŵ;ź           B.
C.             D.
11A13ͨõΪ:(  B  )
A.16                       B.256
C.128                      D.2048
12Ϲ涨PC M30/32û·: (  D  )
A. 32                    B. 28
C. 31                    D. 30
13Ҫص:(  B  )
A.ȵ            B.СźСźȴ
C.ڽ          D.Сźȴ󣬴źС
14PCM30/32·ϵͳУλظƵΪ:(  B  )
A. 0.5kHz                  B. 256kHz 
C. 8kHz                    D. 2048kHz
15SDHSTM-1Ϊ(  D  )
A.64kb/s          			  B.2.048Mb/s
C.8.448Mb/s        		  D.155.52 Mb/s
16PAMźȷ:(  BC  )
A. ʱ       B. ʱɢ
C.          D. ɢ
17ͨŷʽģźŷʽȵҪŵ:( ABCD )
A. ǿۻ
B. 豸ڼɻСͻ
C. źڼ
D. ǿӦҵҪ
18ЩCMIȷ:(  ABD  )
A. 1B2B         B. һ
C. ڶʱȡ         D. ֳ

3⣺
1ҵźŸýSTM-N֡Ĺ̶Ҫ ӳ  λ  衣
2SDH֡ṹ  ο     AU PTR     ֹɡSTM-Nĸ÷ʽ  ֽڼ  
3ֽܹɵĹܰ    ֡λ   ͨ  
4ݷʽ˵öαΪ 1:1 ҵ񼶱ͨΪ 1+1 ҵ񼶱
5Ķ˵ͨıԸΪĸ֣  ѡ     䱣ΪٶΪ4ڵɵSTM-4   STM-4    ֱʽص  Ҫ   APSЭ飬      ҵ
6˫öαĵı  2STM-4  ٶΪ4ڵɵSTM-4ص   Ҫ   APSЭ飬  ɢ   ҵ
7DWDM豸    OTMն˸豸      OADMֲ帴豸       OLAŴ豸  
8һǿȵĹⲨڹлʱ˵  ᵼ²µĲ  ĲƵЧӦ   
9ڲָϵͳй⹦ʵƽֵ    ȫֵ   Ӱ   ء
10ƣPCMƣһֽźű任źŵı뷽ʽ
11ҹPCMϵͳ֡ṹǺŷ޲õPCM30/32·Ʒʽһ¡
12ƣPCṂǳͱ롣
13ͨϵͳУͨʱָõķʵֶ·źŵͬʱ䡣
14ҹPCMͨϵͳźֻһõA13ߵķǾ
15PCM30/32·ϵͳУÿʱ488ns?
16PCM30/32·ϵͳУ֡ظƵΪ500HZΪ2ms?
17PCM30/32·ϵͳУTS0ڴ֡ͬźţTS16ڴͻ·
18PCM30/32·ϵҪûӿFXSFXO4WE/M
19PCMȺĽӿΪHDB3
20PCM30/32·ϵͳõʽ·ʽ

4⣺
1)34.368Mbits֧·źӳ䡢λýSTM-1֡ṹľ̲ÿһδõ֡ṹʡ
𣺢34.368Mb/sźȾٵ䵽Ӧı׼C-3УC-3ΪϢ 84988000=48.384Mb/sC3֡1-85POH
C-3VC-3  POHӳVC-3,=ϢPOH=48.384+ 0.576=48.96 Mb/s 
POH 1988000=576kb/s
VC-3ָ TU-PTR3ֽڵ֧·Ԫָ룩λTU-3ΪTU-3=48.960.19249.152 Mb/s   1*3*8*8000=192Kb/s
TU-3ֽڸýTUG-3 ΪTUG-3=49.152+0.384Mb/s=49.536Mb/s
1688000=384kb/sֽڣ
3TUG-3úVC4 POHӳVC4Ϊ49.53630.5763150.336 Mb/s
VC-4AU-PTRλAU-4Ϊ150.3360.576150.912 Mb/s
1AU-4ýAUGΪ150.912 Mb/s
AUGSOHγSTM-1֡ṹΪ150.9124.608155.52 Mb/s
2ʲôǽ˻ءԶ˻ءӲءأҪʲôмͣͼ˵
𣺽˻ָûĻء
Զ˻ָĻء
ӲؼӲʵ壨ߣշͨĻء
ֶָΣܣʹͨշ̽Ļء
ҪڹϵķͶλ
Ӳأ·շ˻ءأն˲໷غ·໷ءͼ

3˵SDHġԪָ붪ʧAU-LOP澯Ĳԭ򡢴̡衣
AU-LOPԭ
1ԶվͶʱйϣ߹ϡ
2ԶվͶûýҵ      
3
̣
[ʼ][Զվվҵ][ҵǷ][ԶվӦ][ԶվӦ·][վ][վ·][]
裺
1) ԶվվҵǷȷȷҵ
2) ҵΪ140	Mҵ񣬼ҵǷȷ롣
3) θԶվӦĽ·壬λϵ㡣
4) վ·ͽ塣
4SDH֡ṹпɣʲôã
SDH֡ṹа˶οSOHͨPOHֱڶβͨάSOHΪοRSOH͸öοMSOHаж֡ϢάܼӵϢԼܡPOHΪͽVC POHҪVCܼͨӡάźż澯״ָ̬ʾȣ߽VC POHҪVCܼͨӡ澯״ָ̬ʾάźԼýṹָʾȡ
5澯Ҫʲô
𣺣1 ͨ۲ܼݣҪѯOTUܼûطжϵص㲢϶λΣ
AȷϹڵ뻹˫룻
B Ƿвͨ룬Ǹͨ룻
ͨ˵·ϻͨص豸ϣҪصϵͳֻͨǲͨϵͳٽ״̬ǸͨԼԭ絥վڵβӡOTU̵ȡ
2 ѯ豸쳣澯(źӻ볬ޡ⹦ʹ͵)϶λΣ
3 ʹ϶ȡշ⹦ʣ뿢ݽжԱȣ⹦ʲӦҹ¡βˡ̡˥ⲿ⣨滻ȻٿǷΪ豸ϣֱڣ
豸շ⹦ʾ䣬ͨصĹȺҳ䣬϶λվ豸
4 ݾ鴦ϵͳкϷֲȶǴѧһ㲻룬OTU͹Ŵ壬л̸λֱϴ
6)OTU޹澯澯źʧĺ
޹澯˵վӦûнźŷ͹
澯ʾվӦ⹦ʵڸ澯ֵ
źʧ澯ʾվǰ׹⣬źź֡ṹ
7SDHδͶʱϢܷϢҵͨͶʱϢΪʲô
SDH紫ͶʱϢַʽ
1ԪʱӷŵSDHϴSTMNźУSDHԪͨ豸SPIܿȡSTMNеʱźţиͬʽһ£
2ͨSETPIṩʱڽԪʱSDHԪΪSETPIPDHڣһ㲻ãΪSDH/PDH߽紦ָӰʱź
8˵SDHġ֡ʧ(R-LOF)澯Ĳԭ򼰴衣
R-LOFԭ
1) ˥Ĺ
2) Զվź֡ṹ
3) ˽շйϡ
裺
1) 澯չ⹦ʣ⹦澯Ƿ⡣
2) ⹦ʳΧԶվվ˼ӿǷ𻵡
3˼澯嶼ԶվⷢͰǷ⡣
9) ĳSDHͼ£˫˵ͨʽ˳ʱΪʱΪBCDEվAվ㿪52Mҵҵ񣬵վCDվβ˹ʱվ澯

١Aվ㣺EDվӦ2Mҵ񱣻ʱ϶AIS澯
ڡBվ㣺AվӦ2Mҵ񱣻ʱ϶AIS澯
ۡCվDվ㷽޹澯AվӦ2Mҵ񱣻ʱ϶AIS澯
ܡDEվ޸澯
   10ͨϵͳЩɲ֣
ͨϵͳĻɰϢԴ豸ŵ豸߼Դ
   11PCMͨϵͳϢģ
PCMͨϵͳϢΪͶ˶ģźŽгźţPCMźţŵնˣźŵ룬õͨ˲˳ģźš
12ո֧·еĹɣźŵĸӿɷΪļַʽʱֿɷΪļַʽ
𣺰ո֧·еĹɣźŵĸӿɷΪλ ָ ַ֡ʽʱֿɷΪͬӺ첽ַʽ
13ģźŵͨͳģ
ģźŵͨͳָظƵʱ벻СģźƵʵ
   14ʵַǾķЩ? 
ʵַǾķģѹŷֱӷǾȱ뷨֡
15ΪʲôͬҪٱ任
ͬȻͶ˱ӵĸʹȺ֧·źŵȫͬӺлҪ֡ͬ롢澯ȸԪʹźŵӣͬӹҪٱ任
5
1ABCDĸԪ˫ͨABCD102MҵBCDûҵʶĸԪĹкҪ
   3X10=3063ͨԹʴﵽSTM-1Ϳˡ
2)ABCDĸԪ˫öλABCD152MҵABCD̫ǵ㵽20MBCDҵԪĹкҪ
153+103=75,ʹһݣĴΪ752M˫öλSTM-4ϣԹSTM-4
3)OPA2217ӲODUODUCH110GOTUR塣֪ODU5dB,10GOTURջص0dBm-14dBmԼϵͳͨ16ҵOPA⹦ʺС⹦ʡ

1OPA⹦ʾǱ֤OTURصĹ⹦ʡ㷽£
ȼOTURصOPAͨ⹦ֵ055dBm
Ȼ16OPA⹦ֵ05+10LOG1617dBm
õ16OPA⹦ֵ05+10LOG1622-5 dBm
2OPAС⹦ʾǱ֤OTURȵĹ⹦ʡ㷽£
ȼOTURչﵽOPAͨС⹦ֵ-145-9dBm
Ȼ16OPA⹦ֵ-145+10LOG163dBm
õ16OPA⹦ֵ-145+10LOG1622-1
4)ŵ˹⹦0dBmÿŴָNF6dBÿ80˿22dBһ8ιŴ·OSNRԼΪ٣
OSNR58dB˹⹦ʣNFÿģ10logĿ5810log21db
5)ڵ,һ2.2ǧ,ڶڵһڵ1ǧ״һоͷʽ䣬ܹ⹦2.5mWƵڵ⹦Ϊ-2dbmֱΪ31%34.5%34.5%ʹ1310nmźţڵ㴦Ĺ⹦ʡ·ĸ0.3 µ۽Ӻͻͷ0.5
2.5mW=4.0dbm
2.2KM0.4=0.88db
ֹ˥Ϊ4.0-0.88=3.12db
һڵ㣺
31%֧·=3.12db+10lg0.31-0.3-0.5=-2.67db
ڶڵ㣺
34.5%֧·=3.12db+10lg0.345-0.3-0.4-0.5=-2.7db
6)ĳSTM-1 SDHϢʹøöDCCΪϢͨͨʡ
=9*8*8000=576kbps
7֪30/32·PCMȺÿһ·ĳƵΪfs=8000HzÿһֵΪ8λһ֡32·ʱ϶˻ȺfbǶ٣
Ϊ
fb = 32  8000  8
             = 2.048Mbit/s
8ĳ312kHz552 kHzͨźŵĳƵfs
Ϊ BfHfL552312240 kHz
ɵ nfL/B312/2401.3
ȡ n1
  fs=2(fLfH) /2n1576kHz
 1 ҳ  16 ҳ

