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Nghien Cuu Ve Chuyen Mach Chum

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Cng ha x hi ch ngha Vit Nam c lp-T do-Hnh phc LI CAM OAN Knh tha cc thy c trong hi ng bo v n tt nghip. Em tn l: V Th Kim Tuyn L sinh vin lp 03DT2- Khoa in t vin thng Em xin cam oan n tt nghip ny do em thc hin, khng phi l bn sao chp cc n hay cng trnh nghin cu c t trc. Nu c vn g xy ra em xin chu hon ton trch nhim. Nng thng 6/2008 Sinh vin thc hin V Th Kim Tuyn

MC LCCC CH VIT TT............................................................................................4 M U................................................................................................................6 Chng 1 TNG QUAN V CHUYN MCH CHM QUANG.......................9 1.1. 1.2. 1.3. 1.3.1. 1.3.2. 1.3.3. 1.4. 1.5. 1.5.1. 1.5.2. 1.6.2.1 2.2 2.2.1. 2.2.2. 2.2.3. 2.2.4.

Gii thiu chng.....................................................................................9 Cc th h mng quang.............................................................................9 Cc cng ngh chuyn mch quang..........................................................10 Chuyn mch knh quang OCS................................................................11 Chuyn mch gi quang OPS...................................................................11 Chuyn mch chm quang OBS...............................................................12 Nguyn tc thit lp burst.........................................................................13 Thi gian offset........................................................................................17 Offset c nh...........................................................................................18 Offset khi khng c d tr........................................................................19 Kt lun chng.......................................................................................19 Gii thiu chng.....................................................................................20 Kin trc mng OBS.................................................................................20 Kin trc OBS dng mt li...................................................................21 Kin trc OBS dng vng node................................................................22 Cu trc v chc nng ca node bin........................................................24 Cu trc v chc nng ca node li..........................................................27 Kt lun chng.......................................................................................29 Gii thiu chng.....................................................................................30 Bo hiu trong mng OBS........................................................................30 Phn loi cc giao thc bo hiu...............................................................31

Chng 2 KIN TRC MNG CHUYN MCH CHM QUANG OBS.........20

2.3 3.1. 3.2. 3.2.1.

Chng 3 BO HIU V GII QUYT XUNG T TRONG MNG OBS...30

3.2.1.1. Bo hiu mt chiu, hai chiu hay kt hp...............................................32

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3.2.12. Phng thc d tr c khi to node ngun, node ch v node trung gian................................................................................................................32 3.2.1.3. Phng thc bn (Persistent) hay khng bn (Non-Persistent).................33 3.2.1.4 D tr tc thi (Intermediate Reservation) hay d tr c tr hon (Delayed Reservation)............................................................................................................34 3.2.1.5. Gii ta tng minh (Explicit Release) hay khng tng minh (Implicit Release) ..................................................................................................................34 3.2.1.6. Bo hiu tp trung hay phn b................................................................35 3.2.2. 3.2.3. 3.2.4. 3.2.5. 3.3 3.3.1. 3.3.2. 3.3.3. 3.3.4. 3.4. 4.1. 4.2. 4.3. 4.3.1. Giao thc bo hiu JET (Just Enough Time)............................................36 Giao thc bo hiu TAW (Tell And Wait)...............................................38 Bo hiu c khi to ti node trung gian INI (Intermediate Node V d minh ha.........................................................................................42 Cc phng php gii quyt xung t trong mng OBS...........................43 Cc ng dy tr quang FDL..................................................................44 B chuyn i bc sng.........................................................................45 nh tuyn chuyn hng.........................................................................46 Phn on burst........................................................................................47 Kt lun chng.......................................................................................48 CC GII THUT XP LCH TRONG MNG OBS......................49 Gii thiu chng.....................................................................................49 Cc thng s s dng trong cc thut ton sp xp...................................49 Cc gii thut xp lch c bn...................................................................50 Khng s dng void filling.......................................................................50

Initiated)..................................................................................................................40

Chng 4

4.3.1.1. Gii thut FFUC.......................................................................................50 4.3.1.2. Gii thut LAUC......................................................................................51 4.3.2. C s dng void filling.............................................................................52 4.3.2.1. Gii thut FFUC_VF................................................................................53 4.3.2.2. Gii thut LAUC_VF...............................................................................55

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4.3.3.

Vn s dng FDL trong cc gii thut xp lch....................................55

4.3.3.1. Thut ton khng s dng FDL................................................................56 4.3.3.2. Thut ton c s dng FDL......................................................................59 4.55.1. 5.2. 5.3. 5.3.1. 5.3.2. 5.3.3. 5.3.4. 5.3.5. 5.3.5.1. 5.3.5.2. 5.4. 5.4.1. 5.4.2. 5.4.3. 5.4.4. 5.5

Kt lun chng.......................................................................................60 M PHNG V KT QU...............................................................61 Gii thiu chng.....................................................................................61 Gii thiu phn mm NS2........................................................................61 M phng cc gii thut xp lch trong mng OBS..................................63 Gii thut FFUC.......................................................................................64 Gii thut LAUC......................................................................................65 Gii thut LAUC_VF...............................................................................65 So snh cc gii thut...............................................................................66 So snh cc thut ton LAUC c v khng s dng FDL.........................67 Thut ton LAUC khng s dng FDL....................................................67 Thut ton LAUC c s dng FDL..........................................................68 M phng nh hng qu trnh thit lp burst..........................................68 nh hng ca thit lp burst n tr trong mng...............................68 Bi ton m phng qu trnh thit lp burst..............................................69 Lu thut ton......................................................................................71 Trng hp mt mc ngng c 2 mc u tin.......................................72 Kt lun chng........................................................................................72

Chng 5

KT LUN V HNG PHT TRIN TI.................................................74 TI LIU THAM KHO.......................................................................................75 PHC LC.............................................................................................................76

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CC CH VIT TT AC ACK ASR ARP AST BAU BBM BFUC BHC BHP CP DCS DIR DR DTWR EDFA FDL FFUC JIT JET INI LAUC LAUC-VF NS NSFNET NAK NACK OBS Access Control Acknowledged Adjustable Synchronous Reservation Acknowledged reservation period Acknowledged sending Time Burst assembly Unit Buffered Burst Multiplexer Best Fit Unscheduled Channel Burst Header Cell Burst Header Packet Control packet Data Channel Scheduling Destination Initiated Reservation Delay Reservation Dynamic Two Way Reservation Erbium Dopted Fiber Amplifier Fiber Delay line First Fit Unscheduled Channel Just In Time Just Enough Time Intermediate Node Initiated Lastest Available Channel LAUC with void Filling Network Simulation National Science Foundation Network Not Acknowledged Negative Acknowledged Optical Burst Switching

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OCS O/E/O OPS QoS OXC RWA SCU SIR SOA SDH SONET SSR TAG TAW VF WADM WC WDM

Optical Circuit Switching Optical/Electronic/Optical Optical Packet Switching Quality of Service Optical Cross Connect Routing Wavelength Assignment Switch Control Unit Source Initiated Reservation Semiconductor optical Amplifier Synchronous Digital Hierarchy Synchronous Optical Network Strict synchronous reservation Tell and Go Tell and Wait Void Filling Wavelength Add-Drop Multiplexer Wavelength Conversion Wavelength Division Multiplexing

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M UTrong giai on hin nay k thut ghp knh phn chia theo bc sng WDM l mt gii php c la chn cung cp mt c s h tng mng nhanh hn nhm p ng s pht trin bng n ca Internet. Tuy nhin, vi s pht trin nhanh chng ca lu lng d liu trn mng, tc x l in t c th khng cn ph hp trong tng lai na, ng thi d liu quang thng b chm li do x l in t ti cc node, do vic tm kim mt phng ph