SIDE (IRT 3930) Virtuaalne kanalijaotus. Loeng 11/2008 Juhtmepõhine juurdepääs Teema - juurdepääs. Võrgu füüsiline kiht. Sideressursi kasutus
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1 SIDE (IRT 3930) Loeng 11/2008 Juhtmepõhine juurdepääs Teema - juurdepääs Avo Ots telekommunikatsiooni õppetool, VCI-100 VCI-101 VCI-100 VCI-101 Virtuaalne kanalijaotus VPI-10, 50 Mbit/s STM Mbit/s VPI-20, 60 Mbit/s Virtual Channel Identifier TTÜ raadio- ja sidetehnika inst. Vaba 45 Mb/s kasutab VPI-0 Virtual Path Identifier Juurdepääs avots@lr.ttu.ee 441 Juurdepääs 442 Võrgu füüsiline kiht 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 Juurdepääs 443 S T M 1 (155Mbps) Sideressursi kasutus ABR - võimalik bitikiirus VBR - muutuv bitikiirus CBR konstantne bitikiirus ABR VBR CBR Juurdepääs 444 C B R PURSE V B R Passive Optical Network (PON) Burst Tükeldamine Multipleksimine Juurdepääs 445 Juurdepääs 446 1
2 * 8 # 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) Juurdepääs 447 Juurdepääs 448 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 Juurdepääs 449 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) Juurdepääs 450 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 Juurdepääs 451 Juurdepääs 452 2
3 ADSL põhiparameetrid QAM 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 Faas Juurdepääs 453 Juurdepääs 454 Discrete Multitone (DMT) Standardne ADSL ja VDSL tarvis Jaotab lairiba alamkanaliteks Põhineb kiirel Fourier teisendusel magnitude channel carrier subchannel (QAM signal) ADSL füüsiline kiht (telefoni juhtmepaar) Power Spectrum POTS Unused subcarrier due to low SNR frequency 4 khz 20 khz 140kHz 1.1` MHz Upstream Subcarriers Downstream Subcarriers Juurdepääs 455 Juurdepääs 456 Kanalikasutus Juhtmepaari sumbuvus 40 Signaal-müra suhe [db] conductor diameter increases kanali number Juurdepääs Juurdepääs 458 3
4 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 Juurdepääs 459 Error correction coding Interleaving Demodulation (QAM ) Channel Estimation to serial Time and frequency synchronisation Juurdepääs 460 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 Juurdepääs 461 Juurdepääs 462 ADSL 2 ja ADSL 2+ ADSL -> ADSL2 0,25 km suureneb ulatus Juurdepääs ,5 6 6,5 7 7,5 km Juurdepääs 464 4
5 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 Juurdepääs 465 Computer Ülekostvus crosstalk Interface and check Demod. Mod. Diagnostics Line unit Line Juurdepääs 466 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 15 Mbps up 55 Mbps down 30 Mbps up 100 Mbps up/down Short Juurdepääs 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 Standardimine Juurdepääs 468 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) Juurdepääs 469 Juurdepääs 470 5
6 Data Triple Play IP telefon IP TV Lõpulingid (11) %20101%20Tutorialv2.pdf Juurdepääs 471 Juurdepääs 472 6
(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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