(1) CCITT X.25 (HDLC/LAPB) SDLC (Synchronous Data Link Control protocol) HDLC High-speed Data Link Control protocol ITU-T/ISO ADCCP Advanced Data Comm

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1 I / HDLC I / 6 2

2 (1) CCITT X.25 (HDLC/LAPB) SDLC (Synchronous Data Link Control protocol) HDLC High-speed Data Link Control protocol ITU-T/ISO ADCCP Advanced Data Communication Control Protocol ANSI ( ) LAPB Link Access Procedure B CCITT X.25, HDLC I / 6 3 (2) ISDN X.21 bit-oriented bit-stuffing connection-oriented I / 6 4

3 X.25 Network Model DTE PSN DCE DTE DCE PSE DTE: Data Terminal Equipment DCE: Data Circuit terminating Equipment PSE: Packet Switch Exchange PSN: Packet Switch Network DCE DTE I / 6 5 HDLC frame (1) Address: Control: Data: Checksum: CRC-CCITT >= address Control Data Checksum I / 6 6

4 HDLC frame (2) b1 b2 b3 b4 b5 b6 b7 b8 0 N(S) P/F N(R) 1 0 S P/F N(R) 1 1 M P/F N(R) N(S): N(R): P/F: / S: M: I / 6 7 HDLC frame (3) / (poll bit) (final bit) N(S) if N(R) =k: (k-1) I / 6 8

5 HDLC frame (4) S RR REJ N(R) N(R) RNR Go-back-N N(R) N(R) SREJ N(R) RR Selective-Repeat N(R) I / 6 9 HDLC frame (4) A SNRM(B),P (data transmission)... DISC(B),P B UA(B),F UA(B),F I / 6 10

6 2. ATM I / 6 11 ATM ATM: Asynchronous Transfer Mode 53octet (cell) cut-through VP (Virtual Path) VC (Virtual Circuit) ATM Adaptation Layer (AAL) I / 6 12

7 VP & VC VP: node/node VPI VC: node/node VCI I / 6 13 ATM Network Model Logical topology /VC IEEE802.1q Tag VLAN I / 6 14

8 ATM sub-layers I/F Signaling ATM Adaptation Layer (AAL) ATM Layer Data Transmission VC/VP based switch routing Physical Layer I / 6 15 ATM SONET (Synchronous Optical Network) OC (Optical Carrier level) OC Mbps OC Mbps OC Mbps OC Mbps OC Gbps OC-3 OC-12, OC-48, OC-192 I / 6 16

9 ATM Adaptation Layer (AAL) ATM AAL1 AAL2 MPEG2 AAL3/4 AAL5 ATM Forum ATM AAL5 I / 6 17 ATM PVC (Permanent Virtual Circuit) VC SVC (Switched Virtual Circuit) VC LAN Emulation I / 6 18

10 ATM PVC VC PVP VC I / 6 19 ATM NTT MegaLink ATM ATM VC Single Mode Fiber (traffic shaper) I / 6 20

11 3. LAN I / 6 21 Ethernet (10, 100, G) CSMA/CD FDDI Token Ring ATM VC (Virtual Circuit) VP (Virtual Path) POS 2 PPP Over SONET I / 6 22

12 LAN (Media Access Control) (controlled) TDMA (Time Division Multiple Access) Token Passing (contention) ALOHA, CSMA, CSMA/CD... I / 6 23 TDMA (1) Time Division Multiple Access T N 1.5Mbps 64Kbps I / 6 24

13 TDMA (2) frame (N=8) terminal B terminal A I / 6 25 TDMA (3) I / 6 26

14 TDMA ATM TDMA TDMA TDMA LAN ATM LAN TDMA I / 6 27 Pure ALOHA (1) ALOHA System uplink downlink RTT (Round Trip Time) ACK [0,K] : r r I / 6 28

15 Pure ALOHA (2) K I / 6 29 slotted ALOHA pure ALOHA I / 6 30

16 CSMA Carrier Sense Multiple Access RTT/2 I / 6 31 CSMA 1-persistent CSMA p-persisitent CSMA nonpersistent CSMA I / 6 32

17 CSMA/CD CSMA with Collision Detection Ethernet binary backoff backoff timer I / 6 33 Token Passing (Token Bus), (Token Ring) FDDI Token Passing (token) token holding timer I / 6 34

18 Pure ALOHA Slotted ALOHA CSMA CSMA/CD (Ethernet) Token Ring FDDI TDMA ATM I / persistent CSMA/CD (Ethernet) Token Ring CSMA/CD Token Ring I / 6 36

19 4. Ethernet (IEEE802.3 family) I / 6 37 Ethernet CSMA/CD LAN IEEE Mbps, 1500octet MTU LAN 10Base5, 10Base2 UTP 10BaseT I / 6 38

20 Fast Ethernet 100Mbps Ethernet UTP/CAT5 10Mbps Ethernet Bidirectional 100BaseT Auto-sense / Auto-negotiation 1 0BaseT/100BaseT, Unidirectional / Bidirectional I / 6 39 Gigabit Ethernet (IEEE802.3z) 1Gbps 1Gbps 1000Base-SX ( ), 1000Base-LX ( ) IEEE802.3z NIC I / 6 40

21 Gigabit Ethernet (IEEE802.3ab) Gigabit Ethernet 1000Base-T I / 6 41 Ethernet Ethernet Fast Ethernet Gigabit Ethernet Data Rate 10Mbps 100Mbps 1Gbps CAT 5 UTP 100m 100m 100m (CAT5+/6) STP/Coax 500m 100m N/A Multi-mode Fiber 2Km 412m (hd*) 2Km (fd*) 550m Single-mode Fiber 25Km 20Km > 5Km *IEEE half duplex/full duplex ) IEEE 802.3z I / 6 42

22 Ethernet Family Fast Ethernet 10BaseT 10BaseT ATM I / Gbps Ethernet IEEE802.3ae Ethernet 10Gbps Ethernet 10GBASE-LR (1310nm) 10GBASE-EX4(1550nm WWDM 10Km 50Km I / 6 44

23 I / 6 45 xdsl ADSL: Asymmetric Digital Subscriber Line 3Mbps, 8Mbps, 12Mbps VDSL: Very high bit rate Digital Subscriber Line 2 25Mbps 50Mbps SDSL: Symmetric Digital Subscriber Line HDSL: High bit rate Digital Subscriber Line I / 6 46

24 xdsl DSLAM aggregator CPE I / 6 47 Peripheral Bus HIPPI (800Mbps/32bit, 1.6Gbps/64bit) FibreChannel (FC) (266Mbps, ) Myrinet ( max 4Gbps) SCI (6.4Gbps and higher) IEEE1394 ( 100Mbps 400Mbps) E I/F Opt I/F Ethernet family I / 6 48

25 WDM Wave-Division Multiplex ( ) ( ) SONET OC-48 8 LAN WDM Nbase CIENA I / 6 49 D-WDM: Dense Wavelength Division Multiplexing OC48(2.4G), OC192(9.6G).100G I / 6 50

26 IEEE Wireless Ethernet a: 54Mbps / 5.7GHz b: 11Mbps / 2.4GHz g: 50Mbps / 2.4GHz SS WiFi I / 6 51

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Microsoft PowerPoint 情報ネットワーク論 I データリンク技術 (2) 門林雄基奈良先端科学技術大学院大学概要さまざまなデータリンクの基本形を学習 WAN のデータリンク技術 : 回線交換 LAN のデータリンク技術 : 媒体アクセス制御これを知らずしてユビキタスを語るな ALOHA CSMA/CD, CSMA/CA データリンク技術の発展いつでもどこでもはいかにして実現されるかデータリンク技術の基本形 (1):