(IRT 3930) CPE Settop Box 4-8 Mbit MPEG Mbit MPEG-4 AVC 8-12 Mbit HDTV MPEG-4 AVC Dear Johan, It s over.
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- Johnathan Matthews
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1 SIDE (IRT 3930) Loeng 15/2007 Juhtmepõhine abonendiliides Teema abonentühendus Põhipunktid Tuumvõrgu ressurss ja selle jaotamine Abonendiliidese realisatsioonid Abonendiliini parameetrid Pakettide/rakkude ülekanne Standardimine Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. Abonentühendus 515 Abonentühendus 516 Paradigma nihe Ühendatud võrgus teenused pole piiratud võrgu tüübiga, vaid ühendatud võrk pakub kõiki teenuseid. IPTV CPE (Access-Switch) 100 Mbit FOC 4 Mbit DSL DVB-C + IP Täna Lähitulevik 100 Mbit TP 100 Mbit TP Settop Box Scartkaabel POTS ISDN VOIP Teenus A Teenus B Teenus C Teenused A, B, C PC TV Telefon QoS toega platvorm (IP, ATM) 4-8 Mbit MPEG-2 Võrk A Võrk B Võrk C Tuumvõrk Mbit MPEG-4 AVC 8-12 Mbit HDTV MPEG-4 AVC Abonentühendus 517 Abonentühendus 518 Kõnekeskus Contact Center Võrgurakendused johan@abc.se Dear Johan, It s over. Sideressursi kasutus ABR - võimalik bitikiirus VBR - muutuv bitikiirus CBR konstantne bitikiirus ABR IP Ühtlustatud sõnumiteenus Unified Messaging S T M 1 (155Mbps) VBR Kaugtöötajad Remote Workers Abonentühendus Koostöö Collaboration CBR Abonentühendus 520 1
2 C B R PURSE V B R Virtuaalne kanalijaotus Burst Tükeldamine VPI-10, 50 Mbit/s STM Mbit/s VCI-100 VCI-101 VCI-100 VCI-101 Multipleksimine Abonentühendus 521 VPI-20, 60 Mbit/s Virtual Channel Identifier Vaba 45 Mb/s kasutab VPI-0 Virtual Path Identifier Abonentühendus 522 Võrgu füüsiline kiht Passive Optical Network (PON) Standard Kiirus Meedia Kaugus PDH E Mbps UTP, STP, coax - PDH E Mbps coax - PDH E3 34 Mbps coax - STM Mbps UTP m STM Mbps MMF 2 km STM Mbps SMF ~ 40 km STM Mbps SMF ~ 40 km STM Gbps SMF ~ 40 km STM Gbps SMF ~ 20 km Abonentühendus 523 Abonentühendus 524 xpon Juurdepääsu realisatsioonid BPON EPON GPON Tuumvõrk Ühenduspunkt Standard ITU-T G.983 IEEE 803.2ah ITU-T G.984 Curb Bandwidth Downstream λ (nm) Upstream λ (nm) Downstream up to 622 Mbps, Upstream 155 Mbps 1490 and Up to symmetric 1.25 Gbps Downstream up to 2.5 Gbps, Upstream 2.5 Gbps 1490 and Fi ber Asym metric Digital Subscriber Line (ADSL) Hybrid Fiber Coax (HFC) Very High Speed DigitalSubscriber Line (VDSL) Fiber to the Curb (FTTC) Copper Transmission ATM Ethernet ATM, Ethernet, TDM Fiber to the Home (FTTH) Abonentühendus 525 Abonentühendus 526 2
3 * 8 # ADSL Reference Architecture Broadband Access Internet Broadband Data Network (ISP) PSTN P H Y Central Office Switch DSLAM ATU-C HPF U-C2 U-C U-R ATU-R Abonentühendus 527 NT U-R2 HPF P H Y Home Network Personal Computer Central Office Voice Switch DSLAM DSL modem Downstream (DS): High data rate Upstream (US): Low data rate DSL modem Customer Premises Telephone DSLAM - Digital Subscriber Line Access Multiplexer Network Low Pass Filter (passes voiceband frequencies) Abonentühendus 528 Uuem ajalugu Number of DSL subscribers 18.7 million worldwide ITU-T completed G and G standards for ADSL ADSL2plus released (G.992.5). It can gain up to 20 Mbps on phone lines as long at 1.5 km. 30 million DSL users worldwide VDSL2 standards under preparation in DSL forum VDSL2 standard verified (G.933.2) symmetrical 100 Mb/s. 115 million DSL users ADSL ITU G ja G Allalaadimiskiirus kuni 8,182 Mb/s Üleslaadimiskiirus kuni 768 Kb/s Abonentühendus 529 Abonentühendus 530 ADSL põhiparameetrid Iga alamkanal kasutab erinevat kandevsagedust, mis on QAM moduleeritud. Kanali ribalaius ja kanalite vahekaugus on KHz Discrete Multi-Tone (DMT) jagab ADSL edastuskanali alamkanaliteks Kasutatakse 256 allalaadimiskanalit ja 32 üleslaadimiskanalit Müra ja kanali parameetreid jälgitakse iga alamkanali korral eraldi Amplituud QAM Faas Abonentühendus 531 Abonentühendus 532 3
4 Discrete Multitone (DMT) Standardne ADSL ja VDSL tarvis Jaotab lairiba alamkanaliteks Põhineb kiirel Fourier teisendusel magnitude channel carrier subchannel (QAM signal) frequency ADSL füüsiline kiht (telefoni juhtmepaar) Power Spectrum POTS 4 khz 20 khz Unused subcarrier due to low SNR 140kHz 1.1` MHz Upstream Subcarriers Downstream Subcarriers Abonentühendus 533 Abonentühendus 534 Kanalikasutus Juhtmepaari sumbuvus 40 Signaal-müra suhe [db] conductor diameter increases kanali number Abonentühendus Abonentühendus 536 DMT (discrete multitone) kasutus f i + 1 = f i + 4 khz αi = 1 Binary input Error correction coding Channel estimation Interleaving ADSL modem Modulation (QAM) OFDM Transmitter Pilot insertion Serial to tone ordering (initialization) Adaptation to burst errors (applied for interleaved data) Binary Output DMT modulation IFFT OFDM Receiver FFT to serial Serial to Adding guard interval Deleting Guard interval Pulse shaping D/A Multipath & BW adaptation Filter A/D RF Tx RF Rx Abonentühendus 537 Error correction coding Interleaving Demodulation (QAM ) Channel Estimation to serial Time and frequency synchronisation Abonentühendus 538 4
5 G F u ll A D S L G G.lite A D S L IS D N 56K 28.8K ADSL realisatsioonid 2 Mb/s 4 Mb/s 8 Mb/s ADSL 2 Suuremad edastuskiirused sama liinipikkuse korral, võrreldes ADSL-ga (kuni 20 Mb/s, liinipikkusel kuni 3 km) Sagedusriba sama mis ADSL-l (kuni 1,1 MHz) Parem sidekvaliteet pikkade liinide korral, täiustatud signaalitöötlusalgoritmid (interferentsi vähendamiseks, SNR mõõtmiseks... Ühenduse loomine võtab aega vähem kui 3 sekundit 14.4K Abonentühendus 539 Abonentühendus 540 ADSL 2 ja ADSL 2+ ADSL -> ADSL2 0,25 km suureneb ulatus Abonentühendus ,5 6 6,5 7 7,5 km Abonentühendus 542 PPPoE PPPoE - võimaldab luua PPP seansse ja kapseldada PPP pakette Ethernetis. 2 staadiumi: Avastamise staadium identifitseeritakse seansi partneri Etherneti MAC aadress Seansi staadium luuakse PPPoE seansi identifikaator PPP seansi jaoks ja kapseldatakse PPP paketid Etherneti kaadri päise välja EtherType väärtuseks seatakse: 0x8863 avastamise staadiumil 0x8864 PPP seansi staadiumil Paketi Ethernet päisele lisatakse: VER TYPE CODE SESSION_ID LENGTH payload Abonentühendus 543 Computer Ülekostvus crosstalk Interface and check Demod. Mod. Diagnostics Line unit Line Abonentühendus 544 5
6 Family ADSL ADSL2 ADSL2plus ADSL2-RE SHDSL (updated 2003) VDSL VDSL2-12 MHz long reach VDSL2-30 MHz ITU G G G G G G G G DSL Technology Name G.dmt G.dmt.bis ADSL2plus Reach Extended G.SHDSL Very-high-datarate DSL Very-high-datarate DSL 2 Very-high-datarate DSL 2 Ratified 55 Mbps down 30 Mbps up 100 Mbps up/down Short Abonentühendus reach Maximum Speed capabilities 7 Mbps down 800 kbps up 8 Mb/s down 1 Mbps up 24 Mbps down 1 Mbps up 8 Mbps down 1 Mbps up 5.6 Mbps up/down 55 Mbps down 15 Mbps up Standardimine Abonentühendus 546 Areng ADSL Performance (24AWG Wire) Line Rate (kb/s) ADSL Down More Video Channels S=1/2 Down ADSL2 Down ADSL2+ Down Minimal Change to 2000 Video Service Area Loop Length (ft) Abonentühendus 547 Abonentühendus 548 Data Triple Play IP telefon IP TV Lõpulingid (15) FTTH%20101%20Tutorialv2.pdf htm Abonentühendus 549 Abonentühendus 550 6
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