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Z??????? ??????????????Z ??????? ???????????????? ?????????1????1????????? ? ?????????????????? ?????????????????????p??????????????????? ?????????????p??? ? ?????????????????? ? ????????????????????????????????????? ????????????? ?? ???ʦ??????????????????????? ???????????????? ? ?????????????????? ? ????????????? ???????????????????? ????????? ? ???????????? ?????????????????????????????????? ?????????????? ? ????????????§?? ???????????????????????????? ????????????????? ? ???????????ҜZ????????????? ? ???????Z????????Z????? ??????????? ? ???????????????????Z??????? ? ???????Z????????????????? ?? ????????????1?? ??? 2005420????????[2000]27???? ?1?ZDD????? ?2?ZDD???? ?3?ZDD?? ?4?ZDDIP? ?5?ZDD?? ?6?ZDD?? ?7?ZDD????VSAT?? ?8?ZDD??? ?1 ?ZDD????? 1.1??????? 1.1.1????????????1???????? 1.1.2???:??15???25? ???20???30? ????????????????? 1.1.3?:??12???24? ???????????????? 1.1.4???:??12???24? ??????????????????? 1.1.5????:??12???24? ?????????????????? 1.1.6???:??24???48? ???36???72? ?????????????????1 ?1?????????? 1.1.7??????????45????15????????45???????????????????? 1.1.8???90? ??????? 1.1.9??????????15? ?(??)???????????? ??????????15????85 ??????????????????????????????????? 1.1.10?????????????95 ?????????????????????? 1.1.11?????¨Z??????????????????????????? 1.1.12?????????????5? 1.2?????? 1.2.1??:??0.8???1? ?????? 1.2.2?? ?????????????1.9???5.3?????10? ?????????????2.2???7?????12? ????????????????2.3???7.2?????13? ???????????? 1.2.3?:??????????95 ???????????90 ?????????????85 ????80 ????????????????????????? =-(???+??+??+?) 1.2.4:????21dB ?????? 1.2.5?:??0.1???1 1.2.6?:????1 1.2.7?:????????0.1 ???????1 1.2.8?:??13? ??????85? ??DCME????150? 1.2.9?:??2104 ???????? 1.2.10????? ???????20???45? ???????????????????????????+???????+???????? 1.2.11????:?????95 ???????????????????? 1.2.12??:????72? ???????????????????????????????ئ??????????? 1.2.13??:????10???24?????99 ???????????????? ?????????????????? 1.2.14??:?? 104 ????????1?? ?????=?/? ??????=/? ?2 ?ZDD???? 2.1?????? 2.1.1????w?Ǧ 2.1.2????????????1???????? 2.1.3??:??1???24? ?????????????????? 2.1.4???:??1???24? ????????????????? 2.1.5?????:??24???48? ?????????????????????????? 2.1.6?????????45????15????????45???????????????????? 2.1.7????90? ???????? 2.1.8??????????15? ?(??)????????????? ????????15????85 ??????????????????????????????????? 2.1.9???????????????????????????5? 2.2?????? 2.2.1?:w?90?99??20??? 2.2.2?:????????90 ?????????85 ?????80 ??????????????????????????? 2.2.3?? ??????????9???12.5? ??????????9???16? ??????????10.3???19? ??????????????? 2.2.4???:?5 ?????? 2.2.5????:???3 ??????????? 2.2.6?????:??????99 ????????????????? 2.2.7???? ??????3???24???????95 ???????????????? ???????????????????? 2.2.8????:?????105 ????????????24?????????? 2.2.9??? ????72? ???????????????????????????ئ??????????? 2.2.10??:???104 ????????1?? ??=?/? ?3?ZDD?? 3.1???? 3.1.1???? 3.1.1.1??????C?? ??12???24? ??????C???????????????? 3.1.1.2???????? ??12???24? ????????????????????? 3.1.1.3???????????????? 3.1.1.4????????? 3.1.1.5????:??8???12? ?????????????????? 3.1.2???? 3.1.2.1???:??90 ????????????? 3.1.2.2????:???8???11? ?????????????????? 3.1.2.3 ??:???99 ????????? ????????ڧ?99%??????? 3.2???? 3.2.1???? 3.2.1.1??????????w???? 3.2.1.2??:??3???5? ?????????????????? 3.2.1.3??:??2???4? ?????????????? ?:??????? 3.2.1.4????:??8???12? ?????????????????? 3.2.2???? ??????????IP??????????????()??????????1000? 3.2.2.1IP?:???200? IP????IP???(A)???(B)????(A)??? 3.2.2.2IP??:????80? IP??????IP?IP???? 3.2.2.3IP?:???2% IP??IP????? 3.2.2.4IP?:IP??99.9 IP?????IP??IP?????5??IP????75???????? 3.3X.25DDN????? 3.3.1X.25DDN????? 3.3.1.1??:??4???8? ?????????????????? 3.3.1.2?? ???3???5? ????4???7? ??????????????? 3.3.1.3????:??4???8? ?????????????????? 3.3.2X.25DDN????? 3.3.2.1X.25???? 3.3.2.1.1???1 ????????????????1?????1X?2 3.3.2.1.2????3 ??????????,???????3 ??????3Y?4 1????? ?? () ???() () A B A B A B ?? 2000+2X 2600+2X 1000+X 1600+X 250 1600 95? 2700+2X 3100+2X 1500+X 2100+X 250 1800 ?1.95?95?????2.A???3.B?????????4.A??????5.B??????????6.X=400/RR????kbit/s7.?D?ITU-T X.25?Ǧ????٦ʦ??D?????????D???p25 2?????X? R(kbit/s) X() 2.4 167 4.8 84 9.6 42 48.0 9 64.0 6 3?????? ?? () ???() () A B A B A B ?? 700+2Y 1000+2Y 350+Y 650+Y 215 950 95%?? 950+2Y 1250+2Y 525+Y 825+Y 215 1125 ?1.?????????,????2.95?95?????3.AB4.2?4.?D????128???136D????DTE????? 4??????Y? R(kbit/s) Y() 2.4 453 4.8 227 9.6 113 48.0 23 64.0 20 ?:R????kbit/s 3.3.2.1.3??5 ??????????(????)???5??? 5??? ?? ?bit/s ?bit/s A B A B ?? 3500 2400 2000 2000 95? 2400 2000 1800 1800 ?1.??????2.95?95???3.AB4.2?4.?D??9600bit/s?D???128??D???2???7D?D?D=0D?ʦ???D???????D???2002? 3.3.2.1.4????95 ???????? 3.3.2.1.5??99.99 ??????????? 3.3.2.2DDN???? 3.3.2.2.1??? 1? ?????UNIDDN????????? ?M.2100PDH????????M.2101SDH???????? 2? ?????UNI???? ?YD/T748-95PDH????YDN 026-1997SDH?DSDH????????? 3.3.2.2.2???? 164kbit/s?????40? 22Mbit/s??????0.5N+0.005G?N??G??km 31?2??????300? ?DDN????????? 3.3.2.2.3??99.99 ???????????? 3.3.2.3????? 3.3.2.3.1??(FTD)??(FTD)< 400? ??????????? ?????FTD= t2-t1 ?t1?????1?????? t2????????? 3.3.2.3.2??(FLR)??(FLR)< 3X10-5 ??????????? ?????FLR= ?FL ?????FS ???? FE ?? ???????(CIR)??????(FLRE)???(FLRC)? 3.3.2.3.3???99.99 ???????????? ?4?ZDDIP? 4.1IP??? 4.1.1??????IP??IP???????????????????????? 4.1.2??IP?? ??24???48? ??IP?????????IP???? 4.1.3??IP? ??24???48? ??IP????IP?????IP????? 4.1.4??IP????????????? 4.1.5??IP??????????? 4.1.6IP????? ??12???24? IP??????????????????IP?????????IP???? 4.1.7???????IP??IP???ݍ?IP????5? 4.2IP??? 4.2.1?? ???????7???11? ???????11???21? ???????11???15? ???????15???24? ???????????????? ???????IP???????????? 4.2.2?????400? ??????????? 4.2.3??????80? ???????IPIP??????IP?IP???? 4.2.4???5 ?????RTPIP????RTP(??RTP)?RTP?? 4.2.5??????72 ????????????y?????? 4.2.6????5 ????????? ?5?ZDD?? 5.1???? 5.1.1????????????????? 5.1.2???????12???24? ??????????????????? 5.1.3??????15? ?????????????? 5.1.4???????? 5.1.5????????????e????????10??e??????????10?? 5.1.6???????????????? 5.1.7?????90? ?????????? 5.1.8?????????????????? ??????15???151? 5.2???? 5.2.1???? ????????????6? ?????????????10? ?????????????????????????????? 5.2.2????????95???? ???????????????????? 5.2.3?? ????60???400? ???90? ???7? ???7? ʧ??10? ??????????????????????? 5.2.4??????95 ????????????? ?6?ZDD?? 6.1????????????????????????? 6.2?????ʧ????????????????????????? ???????????????????????? ?????????????????????????? 6.3????????????????????????????????????????????? 6.4????????????????????????? 6.5???????????????????????95? 6.6?????????????????????000000000??????? ?????????????? 6.7??????????????????????????5??????????????? 6.8???????????????????????????????? 6.9??????????????????????? 6.10???????? ?7?ZDD????VSAT?? 7.1????VSAT???? 7.1.1?????20???30? ???25???40? ??????????????????????????????????? 7.1.2??????3???7? ???7???15? ???????????????????????????????????? 7.1.3?? ??VSAT????????VSAT?????? 7.2????(VSAT)???? 7.2.1??? ???99.5C???Ku??? ???????????????VSAT?????? 7.2.2????????92 ????VSAT??????VSAT???VSAT???????????1??????????? 7.2.3???? VSAT????????8???14? VSAT????????16???25? ??VSAT??????11???18? VSAT??????????4???8? 7.2.4??????2104 ????????? ?????VSAT??????? 7.2.5????????107 ?????VSAT????VSAT????????? 7.2.6??????104 ????????? ?8?ZDD??? 8.1????? 8.1.1?? 8.1.1.1???? ??3???5? 8.1.1.2??? ??4???8? 8.1.1.3PDH??VC-n???????????????????? ??????????????? 8.1.2?? 8.1.2.1???????20???30? 8.1.2.2?????33.3.1.2? 8.1.2.3PDH??VC-n????????????????????? ????????????????? 8.1.3??? 8.1.3.1????????24???48? 8.1.3.2??????33.3.1.3? 8.1.3.3PDH??VC-n?????????????????????? ????????????????? 8.1.4??????24???48? ?????????????????? 8.2????? 8.2.1??? ????????????????????????????????GB 11053???GB 11054??? 8.2.2????33.3.2.2֧?? 8.2.3PDH??VC-n???? PDH???283445140Mbit/s??? VC-n???VC-12VC-3VC-4VC-4-Xc???? PDH??VC-n????????????????? 8.2.3.1 PDH????YD/T 748PDH????? 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