Cong nghe-Giai phap
Cdc dong liTc thuc day . ^ ^ tfch hop IP/quang
ThS. Nguyen Trong Tam
Viec tich hdp mang IP va mang quang la xu the tat yeu tao nen mang 161 Internet quang - co s d cho mang the he s a u . Cac ket noi cheo q u a n g OXC (Optical Crossconect) da cho phep xay d u n g mang quang d o n g hdn, nhd do cac noi ke't bang t h o n g I6n hdn va luong quang (lightpath) c6 the dUdc thie't lap theo nhu cau.
Qua trinh tich hdp khong nhung giup loai bo mot so x U ly trung gian khong can thiet, lap lai gii/a cac Idp mang ma con c6 the giam bdt so Idp mang. NhCrng Id! ich nay dang la dong lUc thuc day qua trinh tich hdp IP/quang.
1. TICH HOP IP/QUANG N H A M GIAM BCiT LCiP MANG
Su phan Idp theo truyen thdng cac giao tbCfc mang khien cho nhieu Idp ddc lap cd chCfc nang chdng cheo nhau. Vi vay mdt trong nhCfng giai phap de giam chi phi xay dung va quan ly mang mdt each triet de dd la giam so Idp mang. Giam Idp mang cd nghia la loai bd ca mdt nhdm Idp giao thCfc dUpc thufc hien trong Idp thie't bi bay mang
Khi dung lUpng va kha nang ke't ndi mang trong ca cdng nghe IP va quang tang len, thi cang can thie't tdi ufu mang IP va bd qua tat ca cac cdng nghe Idp trung gian de tao nen mang IP/quang bieu qua va mem deo.
Trong giai doan lufu lupng IP chie'm ufu the trong mang thi cau true mang phan lam nhieu Idp khdng cdn thich hpp nCfa. Muc dich la tdi thieu hda phan mao dau va cufc dai hda
bang tan truyen dan bCfu ich. Tat nhien la dp phCfc tap trong giam sat, dieu hanh, lap ke hoach mang va ki thuat cung can giam hdt de cUc tieu hda chi phi dieu hanh ciia nha cung cap dich vu va tang Ipi nhuan. Chung ta cd the loai bd ban ATM, SDH kbi nbu cau lufu lupng cao de truyen trUc tie'p IP(MPLS) trufc tie'p tren quang WDM.
ATM
SDH ATM,SD.H/GI-.E.'RP,R.SDL
WDM
Hinh 1: Xu hudng tich hap IP/quang 2. TICH HOP IP/QUANG NHAM GIAM
L O P G I A O T H L / C . THIET BI
TrUdc day, chi cd 1 each duy nhat de truyen tai cac gdi tin IP tren spi quang suf dung
THfiNG TIN KHKT & KINH ji BUU Dl|N s o 11 / 2 0 0 9 4 1
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^i^ Cong nghe-Giai phap
cdng nghe WDM la ket ndi cac bd dinh tuyen IP tdi cac chuyen mach ATM. Sau dd, cac te' bao ATM se dUpc gufi qua cac thie't bi SONET dupc ke't ndi tdi be thdng truyen dan WDM.
Ke't qua la ngan xep giao thufc cd day dii 4 tang. Trong do, IP mang Cfng dung va dich vu, ATM can thiet cho tich hpp da dich vu (thoai va so lieu), SONET can cho suf ket hpp va bao ve cac ludng, vi du nbU ket hpp cac ludng ATM 155Mbit/s thanh cac ludng STM-16.
Kie'n true nay cd sU chdng cheo chufc nang giCfa cac tang, thdi gian thie't lap dau ndi cham, thdi gian tr§ Idn. Do dac tinh bang tan khdng dupc thiet ke' de bam theo kich thudc gdi IP nen kha nang md rong kem trUdc suf bung nd lufu lUpng, gidi ban kha nang md rong ciia tCfng Idp do dd se anh hudng den toan mang, tang chi phi quan ly, bao dUdng.
Khi tang ATM, SDH bi loai bd, cac gdi tin IP dUpc chuyen trUc tie'p xud'ng tang quang. Viec loai bd tang ATM va SDH tUOng dUOng vdi viec cd it tang phai quan ly hon.
Khi dd IP cd chufc nang ghep kenh, dinh tuyen, cO che phuc hdi va dieu khien, xuf ly lufu lupng dCf lieu va ca cac loai lufu lUpng khac
> » ( S « « ^
BODltUKHliN
Eiao dieu tmyeii tai
SO.>EI/SI)H
Hinh 2: Truyin tai goi IP qua bade song
trong tUOng lai. DWDM cung cap chdc nang truyen dan, bao ve va phuc hdi.
IP dupc cho la giao tbCfc hdi tu, nd dupc thie't kecho giao thCfc Idp 3, dung dia chi mang, dinh tuyen thdng qua cac mang con khac nhau vdi cac cdng nghe Idp 2 khac nhau. Dudi Idp IP, Idp quang sd dung cdng nghe day hCfa hen WDM. Cac ddng cO IP thuc day tich hpp IP/quang bao gdm:
• Suf dung cdng nghe WDM tang dang ke kha nang tan dung bang thdng spi quang.
• Hau bet lufu lUpng Cfng duing deu suf dung IP.
DCf lieu thoai truyen thdng cd the suf dung chuyen mach gdi bang kl thuat VoIP.
IP/WDM ke thufa tinh linh boat, tUOng thich cua giao thCfc dieu khien IP.
• IP/WDM cd the dat dUpc muc tieu cap phat bang thdng theo yeu cau ddng (hoac cap phat thdi gian thufc) trong mang quang: Phat trien mang truyen thdng, mang quang dieu khien phan tan, mang dieu khien rieng, mang tich hpp IP/WDM khdng cbi giam chi phi van hanh mang, ma cdn cung cap tai nguyen dipng theo yeu cau dich vu.
• IP/WDM dupc by vpng phdi hpp cac nha cung cap phan tuf mang vdi sU hd trp ciia giao thCfc IP: cac mang quang yeu cau mat phang dieu khien thdng nhat va de dang thay ddi thdng qua cac mang con dupc cung cap bdi cac nha cung cap WDM, giao thCfc dieu khien IP duac trien khai rong rai va linh boat. MPLS khdng chi cung cap ki thuat dieu khien lufu lupng ma cdn dat duac muc dich cd mdt mat phang (dieu khien thdng nhat trung tam IP.
• KT thuat dieu khien
42 SO 1 1 / 2 0 0 9 THONG TIN KHKT & KINH li BUU D|£N
^t^ Cong nghe-Giai phap
phan tan se tao cO htoi cho IP/WDM dat tdi kha nang pbuic hdi ddng.
• DCfng tren quan diem dich vu, mang IP/WDM cd cac ufu diem ve quan ly chat lupng, cac chinh sach va cac ky thuat duf kien se suf dung va phat trien trong mang IP.
Truyen tai IP hoac tin bieu SDH qua WDM.
Mdt phan mem dieu khien se dieu khien co cau chuyen mach. IP ddng vai trd la mdt cdng nghe Idp mang dUa tren Idp lien ke't dCf lieu de cung cap:
• Khung (trong SONET hoac Ethernet)
• Phat bien ldi (CRC)
• Dieu khien ldi (yeu cau phat lai tU ddng ARQ)
• Mdt muc tieu cua mang quang la cung cap phuong tien truyen tai tuf dau cudi de'n dau cudi giam thieu dUpc cbi phi. Yeu cau nay ddi hdi cac giao dien toan quang va cac co cau chuyen mach toan quang cho cac phan tuf mang bien va giOfa. Cac bd phat dap dUpc suf dung de tang cUdng tin hieu quang.
• Giam Idp giao tbCfc ddng nghia vdi viec giam xuf ly trong cac thie't bi mang. Md hinh tich hpp cho phep tUOng tac giCfa cac Idp mang chat hOn tang hieu qua sd dung dung lupng, giam Idp giao thufc...
3. KET LUAN
IP tren nen WDM la mang quang suf dung cdng nghe WDM cd the cung cap bang thdng rat Idn. Hon nCte, cac Cfng dung, dieu khien trong mang IP/WDM la IP rat linh boat va da dupc biet de'n tCf lau. IP/WDM cd rat nhieu trien vpng va se dUpc sd dung rong rai trong thdi gian tdi.
Hien nay mdt sd hang nhU: Tellium, Cisco, NEC, TILAB, Siemens, Alcatel... da dUci ra cac giai phap tich hpp IP/quang thdng nhat, cho phep phat trien mang mdt each lien ttJC. Tuy nhien de dam bao cd dUpc mdi trUdng mang canh tranh, thi cung can cd cac tieu chuan phu hpp va thdng nhat. Hien nay cac td cbCfc cdng nghiep dang thuf nghiem va hy vpng tdi day se cd mdt chuan thdng nhat.a
TAI LIEU THAM KHAO:
[1]. http://ieeexplore.ieee.org/
[2]. bttp://www.nokiasiemensnetworks.com/
NSN SE CUNG CAP GIAI PHAP 3G CHO MOBIFONE
Theo thdng tin tuf MobiFone thi cdng ty da vCfa thUc hien ky hpp ddng vdi Nokia Siemens Networks (NSN) de nang cap len mang 3G va trien khai mang dudng truic IP nham dap dng nhu cau dCf lieu dang gia tang tren mang cung nhu trien khai bieu qua cac die vu di ddng bang rong.
Viec ky ke't hpp ddng vdi NSN la mdt bUdc tien quan trpng trong qua trinh trien khai mang 3G cuia Mobifone. Cac giai phap 3G cua NSN se giup Mobifone trien khai 3G nhanh chdng ddng thdi cho phep de dang nang cap mang trong tUOng lai.
Theo MobiFone
THONG T I N KHKT & KINH TE BUU DIEN so 1 1 / 2 0 0 9 43
