Bài báo giới thiệu tổng quan về công nghệ mạng truy nhập quang thụ động Ethrnet 10 Gigabit theo tiêu chuẩn ieee Std 802.3av TM - 2009 với vai trò là công nghệ mạng truy nhập kế tiếp tốc độ cao có khả năng hỗ trợ cả tốc độ đối xứng hai hướng 10 Gbit/s và không đối xứng 10 Gbits/s đường lên và 1 Gbit/s đường xuống, trong khi vẫn duy trì tính tương thích ngược với các thiết bị Epon đã được triển khai.
I IK MANG QUANG THU D O N G ETHERNET THE Ht Kt TIEP Le Hai Chau Bai bao gidi thieu tong quan ve cong mang truy nhap quang Gigabit ngtie thu dgng Ethernet theo tieu chuan IEEE Std 10 802.3avTM- 2009 vdi vai tro la cong nghe mang truy nhap ke tiep toe cao co kha nang ho trd ca toe doi xCfng hai hifdng xvfng 10 Gbit/s 10 Gbit/s va khong du'dng len va Gbit/s ddi du'dng xudng, van tri tfnh tifdng thich ngu'dc vdi cac thiet trien bi EPON da dUdc khai G I O I T H I E U CHUNG Cimg vdi nhimg tidn bd ciia cdng nghe mang truy nhdp, cdc loai hinh dich vu duge eung edp bdi cdc nhd khai thde vidn thdng cftng dang ddn thay ddi; bdn canh cde dich vu truydn thdng dft Ueu truydn thdng vide eung cdp bd sung ede dich vu mdi nhu didn thoai ttdn ndn IP vd dich vu hudng video (IPTV, Tivi dd phdn gidi cao HD-TV, ) Vdi kha ndng eung cdp mdt cdch hidu qua vd Mnh td nhidu loai dich vu khde ttdn cimg mdt ndn tang mang truy edp don gidn hda he thdng vd giam gid thdnh eung nhu didn tich cde tram trung tdm, ede mang truy nhdp quang thu ddng PON vdi hai edng nghd canh ttanh ehinh la GPON vd EPON dang duge tridn khai rdng khdp Mang quang thu ddng Ethernet (EPON) hidn theo tidu chudn IEEE 802.3ah eung edp tde dd truy nhdp ddi xiing Gbit/s eho dudng ldn vd dudng xudng (edn ggi la GE-PON bode IG-EPON) Trong taong lai, dd ddp img nhu edu vd chdt lugng vd bang thdng ngdy edng cao eua ede img dung va dich vu hudng video, dung lugng cua mang truy nhdp thd hd kd tidp can tidp tac dugc md rdng, nham dap img cde dich vu hudng video va tich hgp da dich vu ttdn mdt ndn tdng truy nhdp chung Nhdm md rdng tdc dd truy nhap dudng ldn vd dudng xudng ttong EPON hidn ldn mue 10 Gbit/s ttong vdn dam bao khd ndng taong thich nguge vdi cae thidt bi EPON dd duge tridn khai, td chuc chudn hda IEEE dd tidn bdnh phat tridn vd chudn hda cdng nghd mang truy nhdp quang thu ddng Ethernet 10 Gigabit (lOG-EPON) Thdng ndm 2006, IEEE 802.3 TAP CHI CNTT&TT KY (8.2011) I 231 CONG NGHE V I E N THONG 9! Wireless back-haul LIE, WiFi, WiMAX Cable Apartment Hinh Ki&i tnJc chung oja mang lOG EPON thdng bdo kdu ggi thdnh lap nhdm nghidn eim mdi vdi tdn ggi Id "10 Gbit/s PHY for EPON" dd xem xet dinh nghla tdng vdt ly (PHY) eua EPON boat ddng vdi tde dd 10 Gbit/s Sau nhdm nghidn eim di vdo hoat ddng, IEEE 802.3av Task force dugc tiidnh ldp ta thdng ndm 2006 Vide phdt tridn ehuan edng nghe lOG-EPON 802.3av duge hodn tiianh vd phd ehuan vdo thdng nam 2009 (cdn ggi la tidu ehuan IEEE Std 802.3av™-2009) Theo dd, lOGEPON Id ehuan edng nghd mang truy nhdp quang thu ddng Ethernet kd tidp eua edng nghd EPON hien vdi kha nang hd ttg hai loai tde do: Ddi ximg vdi 10 Gbit/s dudng ldn vd dudng xudng; vd khdng ddi ximg vdi 10 Gbit/s dudng xudng vd Gbit/s dudng ldn Hinh I minh hga Mdn tnic chung eua mot mang truy nhdp dua tren cdng nghd lOG-EPON da cung edp ede dudng truy nhdp cho cde loai dieh vu vdi tde dd ddi ximg 10 Gbit/s vd tde dd khdng ddi xiing vdi 10 Gbit/s dudng ldn va Gbit/s dudng xudng Trong mang lOG-EPON, OLT boat ddng nhu tiiidt bi kdt eudi hgp nhdt cho tdt ea eac loai hinh dich vu vd ede ONU eung edp cdc giao didn tmy nhdp cho mdi loai dich vu Vdi kha ndng taong thich vdi cdc mang IG-EPON vd hd ttg qud tiinh ndng edp ddn ddn eua hd tiidng, ONU ttong lOG-EPON bao gdm loai: ONU boat ddng a ehd dd tde dd ddi ximg 10 I TAP CHI CNTT&TT KY (8.2011) Gbit/s; ONU boat ddng d ehd dd tdc dd khdng ddi xiing 10 Gbit/s dudng len vd Gbit/s dudng xudng; vd ONU otdc Gbit/s dudng ldn vd Gbit/s dudng xudng eua ede IG-EPON He tiidng lOG-EPON cd tiid eung cap nhidu loai hinh dieh vu truy cap bang rdng da dang nhu ede loai hinh dich vu FTTx, cdc dudng thud kenh rieng tde dd cao cho ede dich vu thuong mai vd ede diem truy cap eho dieh vu khdng ddy tdc cao Vdi khd ndng phdi hgp hidu qua nhidu didm truy cap Men tnie lOG-EPON ciing phu hgp eho vide eung edp mang mang vd taydn cho cde hd tiidng di ddng nhu LTE, WiFi vd WiMAX Mae du ed thd phai mdt vdi nam nfta cdng nghd lOG-EPON mdi ttd ndn du chin mudi vd mat ky thudt eung nhu vd mat Mnh td dd dugc dua vdo khai thde rdng rai ttong tiii trudng mang truy nhdp, edng nghd lOG-EPON hua hen Id giai phap hidu qua vd Mnh td dd ehuydn hda lidn tue ldn ede hd thdng mang truy nhdp thd he kd tidp, dap iing nhu eau dich vu hudng video va truy cap tde dd cao taong lai CONG NGHE MANG QUANG THU DONG ETHERNET 10 GIGABIT Trong dac ta chudn 802.3av cho mang truy nhdp quang tiiu ddng 10 Gigabit, tdng vdt ly vd tdng Udn CONG NGHE VIEN THONG OSI Reference model IEEE 802.3 Layering diagram Logical Link Control Application Presentation Reconciliation Sublayer (RS) aablt/lOG Media Independent Interface -XGIlllll) Transport > Network Physical Coding Sublayer (PCS) JB^^^V • I Main scope of Physical Medium Attachment (PMA) I |EEE 802 3av Physical Medium Dependent (PMD) Scope of IEEE802.3 J777J~™^™^7» - ^ Mediunfl)ep*nd«nt Intwfica (DMI) Hinh Moi quan he giija ki6n tnic phan tang IEEE 802.3av va mo hinh OSI kdt dft lieu duge phdn nhd them thdnh cdc phdn tdng vd cdc giao dien (Hinh 2) Chuan lOG-EPON 802.3av tri kha nang taong thich hodn toan v(3i cdc fliiet bi EPON Gbit/s hidn tai (chudn 802.3ah) vd dac ta tdng vdt ly bao gdm eae phdn tdng: Phdn tdng tai didu giai (RS); Cde phdn tang ma hda vdt ly (PCS) ddi ximg vd khdng ddi jcimg; Phdn tdng di kdm phuong tien vdt ly (PMA) vd phdn tdng phu thude phuong tidn vdt ly (PMD) cho cae tdc dd dft lieu 10 Gbit/s ddi xiing vd tdc dd khdng ddi ximg dudng ldn 10 Gbit/s vd dudng xudng Gbit/s Phdn tdng PMD chiu ttdch nhidm giao tidp vtiii phuong tidn tmydn dan thdng qua giao didn phu thude phuong tidn (MDI) Giao didn phu tiiude phuong tien dae td ede tin hidu qua phuong tien vat ly vd ede giao didn didn vd eo Phdn tdng PMA bao gdm cdc chuc nang ddng chinh pha, khdi phuc ddng hd, tidp nhdn vd truydn tai Phdn tang PCS ma hda ede bit du lieu tiidnh cdch nhdm ma ed thd truydn dugc qua phuong tidn vdt ly yeu edu Giao dien ddc ldp phuong tien 10 Gbit (XGMn) hoac giao didn ddc lap phuong tidn Gigabit (GMII) dac ta mdt giao didn gifta tdng didu khidn tmy nhdp (MAC) vd tdng vdt ly (PHY) vd phdn tdng RS eung edp ehuydn ddi cho ede tin hidu GMII/ XGMn ddn cde dinh nghla dich vu MAC Chudn cdng nghd mang quang thu ddng Ethernet 10 Gigabit IEEE 802.3av dugc phdt tridn dd tdng tdc dd dft lidu cua eae he tiidng EPON ta I Gbit/s ldn 10 Gbit/s phii hgp vdi giao dien Ethernet 10 Gbit/s Nhidu giao thire duge diing chung gifta hai chudn edng nghd IG-EPON (802.3ah) va lOG-EPON Ky tiiudt ghep kenh tiieo sdng tiid (CWDM) va ghdp kdnh theo thdi gian TDM duge sir dung kdt hgp dd eho phdp eae he thdng IG-EPON vd lOG-EPON cd thd boat ddng tten cimg mdt tdng mang PON Tuong ta nhu vdi IG-EPON, lOG-EPON dua vdo edng nghe VoIP dd tmydn tai luu lugng thoai vd ede dieh vu md phdng kenh CES dd dap img ede ydu edu img dung TDM khde IEEE 802.3av dinh nghia ehd tdng vdt ly eho mang lOG-EPON: - Tde dd ddi ximg: Hd trg tmydn tdi vd thu dft lidu tde dd dudng ldn vd dudng xudng 10 Gbit/s - Tde dd khdng ddi ximg: Hd ttg tde dd dudng ldn 10 Gbit/s vd tdc dd dudng xudng I Gbit/s Tmydn ddn dudng ldn ttong lOG-EPON gidng vdi ttong he thdng IG-EPON taong img hidn tai bdng each dua vdo cde bd thu phat quang theo chd dd burst Trong dd, traydn ddn dudng xudng su dung thu phdt quang ehd dd lien tue nhu ttong cdc thidt bi Ethernet didm-didm tde dd 10 Gbit/s Dft lieu dudng ldn vd dudng xudng duge tmydn tai ttdn cimg mdt mang PON vd duge phdn tach bdng ky thudt ghep kdnh theo budc sdng Dai budc sdng eho TAP CHI CNTT&TT KY (8.2011) 125 CONG NGHE V I E N THONG Dudng xuong Hinh Truyin din d u ^ g I6n vd duong xu6ng he thong lOG-PON kit hop vol IG-PON dudng ldn vd dudng xudng duge lua chgn eho laser ydu edu tai cdc ONU khdng qud ddt Khi edng nghd vd dieh vu phdt tridn, ede mang lOG-EPON se ehuyen ddn ldn ehd tde dd ddi xung DAC D I E M CHINH CUA C O N G cdng sudt thdp, sd 20 the hien quy edng sudt trung binh vd sd 30 thd hidn eho quy cdng sudt cao Bang tdng ket mdi quan hd giua cdc ti Id chia, khoang cdch tmydn dan vd loai quy edng sudt taong iing Ba loai quy edng sudt quang (PRIO/PRXIO, PR20/ PRX20 vd PR30/PRX30) ttong lOG-EPON duge ddc ta dd hd trg ede ti le chia 1:16 vd 1:32 vd khoang cdch tmydn ddn cue dai ttdn 10 km va trdn 20 km Ldp edng sudt thdp PR/PRXIO hd trg suy hao chdn kenh mue 20 dB eho mang PON v(Di ti Id chia Id 1:16 va khoang edeh tmydn ddn cue dai tten 10 km Lcfp quy edng sudt trung binh hd ttg suy hao chdn kenh 24 dB ddi vdi PON ed ti Id chia 1:16 vd khoang each Id 20 km hoac PON ed ti Id chia 1:32 vdi khoang edeh Id 10 km Quy edng sudt cao PR/ PRX30 bd ttg suy hao chdn kenh 29 dB eho PON cd ti Id chia 1:16 vd khoang each cue dai hon 20 km NGHE EPON G I G A B I T Quy cong suat Chuan IEEE 802.3av dinh nghla hai kidu quy cdng sudt ky hidu Id PX hoac PRX Trong dd, ede quy edng sudt PRX duge dinh nghla eho lOG-EPON tdc khdng ddi ximg hoat ddng d tdc 10 Gbit/s dudng xudng vd Gbit/s dudng ldn vd cde quy cdng sudt PR ddnh eho tdc ddi ximg vdi 10 Gbit/s ca dudng ldn vd dudng xudng Mdi quy edng sudt dd lai duge dae ta rd thdm bdng mdt sd kdm theo dai didn cho phdn loai eua nd: Sd 10 the hidn quy Bdng Cac loai quy c6ng suat lOG-EPON ™ ^ c d d » ' •^Kc dtt ' Tiie Suy hao ch^n chia kSnh cvc dai li€a dirtmg lifu dirdrng c§ch cvc xu6ng (Gb/s) Ign (Gb/s) dai [km] Quf cdng su4t TScO^dit PRIO 10.3125 10.3125 10 1:16 20 li$u dSi PR20 10.3125 10.3125 20 1:16 24 PR30 Tdcd^dtf' rPRXroW 10.3125 10.3125 10.3125 1.25 20 10 1:32 1:16 29 20 li$u khdng PRX20 10.3125 1.25 20 1:16 24 dSixAng PRX30 10.3125 1.25 20 1:32 29 x&ng 26 Khoang TAP CHI CNTT&TT KY (8.2011) CONG NGHE VIEN THONG Dudng l£n PXlO/20 Duong xuong PXlO/20 Analog Y~ video 09 c5 NJ 0J Q1 C C f& a Analog video Dudng l£n PRXlO/20/30 Dudng xudng PR(X)10/20/30 We velengtti 1600 1580 1575 1560 1540 1260 J ^1 1560 1540 1500 1480 1360 1260 802 3av Dudng l£n PRlO/20/30 Wavelength [nm] [nm] Hinh Phan bd buoc song IG-EPON va lOG-EPON Phan bo bUdc song dinh nghia cho OG-EPON ndm khoang tii 1260 den 1280 run eho tat ea eae loai quy edng sudt khac Tuy nhidn, dai sdng ndy da bi ehiem bdi dai bude sdng dudng ldn eua IG-EPON, I OG-EPON boat ddng che dd burst tde dd kdp bdng edeh su diing TDMA tde dp khde la lua chpn nhdt de dam bao yeu edu cimg tdn tai eua I OGEPON vd IG-EPON Sira loi thuan FEC Cde dai bude sdng dudng ldn vd dudng xudng eua lOG-EPON duoc phdn bd eua sd tmyen ddn quang eua sgi don mode (Hinh 4) Yeu edu tuong thich va cung tdn tai vdi IG-EPON vd eae he thdng phdn phdi video RF tuong tu da ban ehd eae lua ebon ddi vdi bdng tdn bude sdng hudng dudng xuong lOG-EPON Dai budc sdng dudng xudng 1OG-EPON phdi khdng trimg vd dam bao du dp phdn edeh cdn thidt vdi ede dai bude sdng da lua chon Cdng nghe IG-EPON vd OG-EPON su dung cdc trude dd eho cdc he thdng IG-EPON eung nhu eac each sua ldi thudn FEC khde Trong IG-EPON, he thdng phdn phoi video tuong tu, do, dai bude ma FEC RS(255,239) dupe dinh nghia va la chpn sdng dudng xudng dupe xdc dinh la dai budc sdng tir dp dung cho cde khung Ethernet Trong dd, sua 1575 nm den 1580 nm eho moi loai quy edng sudt loi thudn FEC la ydu edu bdt budc ddi vdi ede kdnh Trong dd, vdi hudng dudng ldn, yeu td kinh te d tde dp 10 Gbit/s OG-EPON Mat khac, thay (gid thdnh thiet bi) dupe xem xdt ddu tidn de quyet vi su diing RS(255, 239) cho ede khung Ethernet dinh su phdn bo bude sdng Dai budc sdng dudng ldn nhu Uong IG-EPON, OG-EPON dp dung loai md FEC RS(255, 223) eho cde day dd ddi ed dinh eua dii dupe chpn lua cho gidm bdt dupe anh hudng tan lieu ludng Ddi vdi tmydn ddn dudng ldn OGsdc ddng thdi cau hinh vd cdng nghd tuong img eho EPON, tir ma FEC I OG-EPON ONU ddu tidn eua mdt don gian va khdng 802.3 frame I FEC burst dudng ldn qud ddt d^ giam a) FEC IG-EPON dupe ddng ehinh gid thdnh chimg TT F F vdi phdn bdt ddu F cua he thdng Vi H I F t FE a E P E E Data Data t E Data l E Data C t e C C C eua burst nhdm II vdy, dai budc sdng b) FEC lOG-EPON eho phep bd gidi dudng len vdi dd Hinh SiB I6i tmbc dudng xu6ng IG-EPON va lOG-EPON ma FEC tai OLT rdng 20 nm dupe TAP CHI CNTT&TT KY (8.2011) 127 CONG NGHE V I E N THONG lOG/lG MAC icno MAC locaoG MAC ^U GMn lOb/tTi PCS PMA PMD Hinh cac dufing truyen du li§u OLT d ch6 dp hoat d6ng tdc dd kdp ddng bd hda ede tir ma moi burst Hoat dong che toe ilu v i o tir kenh "OGPMA DIHI vio tu kenh PON dudng len Diu n den PON dudng len IGPMA (aptfoul) 1CdHKiar ICTUadL/i a) Ph&t tdch miSn quang Hinh Cdu hinh PMD tdc d6 k6p I TAP CHI CNTT&TT KY (8.2011) FlModetecw ICLA b) Phdn tdch miin difn CONG NGHE VIEN THONG SO SANH GICTA lOG-EPON VA EPON Mang tiny cdp quang thu ddng Ethernet hidn (IG-EPON) ehi cung edp tde dd du lidu ddi xiing Gbit/s eho dudng ldn vd dudng xudng Trong mang tiruy cdp quang thu ddng Ethernet 10 Gigabit (1 OG-EPON) b6 tiro ca hai che dp: chd dd ddi xiing vdi tdc dd cao bon (dudng len vd dudng xudng 10 Gbit/s) vd chg dd khdng ddi xiing vdi tdc dp dudng ldn 10 Gbit/s vd tdc dd dudng xudng I Gbit/s Md dudng cho OG-EPON va IG-EPON ldn lupt la 64B/66B vd 8B/10B Nhd su dmig bd ma dudng 64B/66B hieu qua hon, dd du ma OGEPON dupe giam xudng ehi edn 3% so vdi 20% tirong IG-EPON Ngoai ra, mang OG-EPON, mdt loai quy cdng sudt bd sung mdi (PR30/PRX30) dupe dua vdo dl hd trp ti Id chia 1:32 vdi khoang edeh toi da ti-dn 20 km Thay vi Id tiiy ebon nhu tirong ede he thdng IG-EPON, vide thuc hidn sua ldi tmdc (FEC) Id ydu edu bdt budc tirong mang OG-EPON d6 hd tirp tdc dd tmydn ddn 10 Gbit/s vd quy edng sudt mdi Trong dd, ma Reed-Solomon (255, 223) dupe dp dung bat bude eho du lidu tde dd 10 Gbit/s tirong OG-EPON; ma RS(255, 239) Id tiiy chpn tirong IG-EPON Bude sdng dudng xudng eua OGEPON dupe phdn bd eua so bude sdng ndm giiia 1575 nm vd 1580 nm vd ndm ngodi ddi bude sdng phdn phdi video RF tuong tu, ngupe lai, bude sdng dudng len eua OG-EPON dupe cdp phdt ttong cua sd bude sdng tii 1260 den 1280 nm, hodn todn trimg lap vdi mdt phdn dai bude sdng dudng ldn ttong IG-EPON Cdc dac diem khde bidt ehinh giua cdng nghe I OG-EPON vd IG-EPON dupe tong ket ttong Bang Tai lieu tham Ichao [1] IEEE, "802.3av-2009 IEEE Standard for Infonnafion Technology - Part 3: CSMA/CD Access Method and Physical Layer Specifications, Amendment h Physical Layer Specifications and Management Parameters for 10 Gb/s Passive Optical Networks," October 2009 [2] "lOCSb/sEthemetpassiveopticainetwork,"IEEEP802.3av Task Face: http://www.ieee802.org/3/av/index.html [3] K TANAKA, A AGATA AND Y HORIUCHI, "EEE 802.3av lOG-EPON Staxlardization and Its Research and Development Status," IEEE Joinal of Lightwave Technology, Vol.28, No 4, February 2010 [4] M HAJDUCZENIA, H DA SUVA, AND M iVIOTEIRO, "Development of 10 Gb/s EPON in EEE 802.3av," IEEE Communication IVIagazine, July 2008 [5] White paper: "Introduction to EEE 802.3av lOGblt/s Ehternet Passive Optical Networks"ai www.pmc-slerra.com [6] ZTE white paper: Bang So sanh giua lOG-EPON vS IG-EPON D$c dilm Tiiu chuin Budnglin Dii budc sdng ^i&r^xuSng Ticdfda-li^u (/hidng ISn/dudttgxuSni^ T6C df duing Ma hda dn hifu (do du mi hda) IG-EPON 802.3ah 1260-1360 nm - 1500 nm doi xijmg: IG/lG 1.25 Gbit/s 8B/10B (20%) S6 liefng lofi quj> cdng suit (PX 10/20) Tl lochia 1:16 chpn RS(225,239) FEC lOG-EPON 802 iav 1260-1280 nm - 1580 nm doixijmg: lOG/lOG khong doi ximg: lOG/lG 10.3125 Gbit/s 64B/66B (3%) (PR 10/20/30; PRX 10/20/30) 1:16 hoac 1:32 bat bupc RS(225,223) "lOG EPON —Unleashing the Bandwidth Potential" [7] J KANI, AND K SUZUKI, "Standardization Trends of Next-generation 10 Gigdjit-class Passive Optical Network Syztems," NTT Technical Review, Vol.7, November 2009 [8] C CHEN, Z CHAIR, AND B VELIVIURUGAN, "lOG Generation Ethernet EPON: Passive Next Optical Networks,"CFaUFOEC, JThASO, 2009 TAP CHI CNTT&TT KY (8.2011) 29 ... cho OG -EPON va IG -EPON ldn lupt la 64B/66B vd 8B/10B Nhd su dmig bd ma dudng 64B/66B hieu qua hon, dd du ma OGEPON dupe giam xudng ehi edn 3% so vdi 20% tirong IG -EPON Ngoai ra, mang OG -EPON, ... giua lOG -EPON vS IG -EPON D$c dilm Tiiu chuin Budnglin Dii budc sdng ^i&r^xuSng Ticdfda-li^u (/hidng ISn/dudttgxuSni^ T6C df duing Ma hda dn hifu (do du mi hda) IG -EPON 802.3ah 126 0-1 360 nm - 1500... chudn edng nghd IG -EPON (802.3ah) va lOG -EPON Ky tiiudt ghep kenh tiieo sdng tiid (CWDM) va ghdp kdnh theo thdi gian TDM duge sir dung kdt hgp dd eho phdp eae he thdng IG -EPON vd lOG -EPON cd thd boat