Flow Control Information Network 1 /
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1 (2) Suguru Yamaguchi Nara Institute of Science and Technology Department of Information Science
2 Flow Control Information Network 1 /
3 Flow Control DLL : Automatic Repeat Request (ARQ) Stop-and-wait Go-back-N Selective-repeat Information Network 1 /
4 (Unrestricted) Information Network 1 /
5 Stop-and-wait ARQ (1) Sender t 1 t 5 t 4 t 1 t 2 t 3 Receiver t 1 : Round Trip Time t 2 : Frame Transmission Time t 3 : Frame Processing Time t 4 : ACK Transmission Time t 5 : ACK Processing Time Information Network 1 /
6 Stop-and-wait ARQ (2) 1 ACK 2t 1 +t 2 +t 3 +t 4 / 1 Information Network 1 /
7 Stop-and-wait ARQ (3) Timeout Lost ACK Information Network 1 /
8 Automatic Repeat Request (ARQ) SEQ n ACK n = n+1,, n n n, ACK for n n+1 ACK for n ACK for n n+1 Information Network 1 /
9 Go-back-N ARQ (1) Stop-and-Wait Protocol ACK ARQ ARQ i n i+1,2,3 n ACK Information Network 1 /
10 Go-back-N ARQ (2) ACK e.g. 7 Information Network 1 /
11 Go-back-N ARQ (3) ACK Go-back-N N ACK (on-the-fly frame ) Information Network 1 /
12 Selective-Repeat ARQ (1) Go-back-N Go-back-N Go-back-N ( ) Information Network 1 /
13 Selective-Repeat ARQ (2) Negative ACK (NAK) n ACK Information Network 1 /
14 (Role allocation) : Transport Network Data Link Information Network 1 /
15 HDLC & PPP Information Network 1 /
16 High-Level Data Link Control (HDLC) ISO ISDN Information Network 1 /
17 HDLC Frame (1) Address: Control: Data: Checksum: CRC-CCITT Information Network 1 /
18 HDLC Frame (2) Control Field Control field of: (a) an information frame (b) a supervisory frame (c) an unnumbered frame Information Network 1 /
19 HDLC Frame (3) Control Field 3 : Information frame (I-frame) Supervisory frame (S-frame) ARQ Unnumbered frame (U-frame) e.g. Information Network 1 /
20 X.25 WAN: Wide Area Network LAN (Local Area Network) WAN e.g., ISDN CCITT standard ITU-T standard Layer 1 Layer 3 of the OSI reference model Network layer PLP Data link layer HDLC (ITU-T), LAPB (CCITT) Physical layer X.21 bis Information Network 1 /
21 X.25 Network Model DTE DTE PSN DCE DCE PSE DTE: Data Terminal Equipment DCE: Data Circuit terminating Equipment PSE: Packet Switch Exchange PSN: Packet Switch Network DCE DTE Information Network 1 /
22 Point-to-Point Protocol (PPP) PPP (RFC 1557) : demultiplexing Bit transparency: ( ) : : / PPP over SONET/SDH / 2 Information Network 1 /
23 PPP Data Control Protocol PPP (max. frame length, authentication) For IP: IP IP Control Protocol (IPCP) Information Network 1 /
24 PPP Phase Diagram A / Information Network 1 /
25 Sublayers of the Data Link Information Network 1 /
26 1960 (point-to-point connection) 1970 LAN(Local Area Network) ISO/OSI 8802 IEEE802 IEEE802.2 (ISO8802/2) Logical Link Control (LLC) IEEE802.x Information Network 1 /
27 Sublayers of the Data Link Layer Network Layer ISO/OSI Local Area Network Definitions (8802) CCITT Data link Layer Definition Data link Layer Logical Link Control Sublayer Media Access Control Sublayer 8802/2 LLC 8802/3 CSMA/CD 8802/4 Token Bus 8802/5 Token Ring CCITT X.25 (HDLC/LAPB) Physical Layer Information Network 1 /
28 Logical Link Control (LLC) (1) Unacknowledged Connectionless Service (LLC type1) LAN, real-time traffic (voice/speech) Acknowledged Connection-oriented Service (LLC type2) ( ) Information Network 1 /
29 Logical Link Control (LLC) (2) Acknowledged connectionless Service (LLC type3) (acknowledge) Unacknowledged Connection-oriented Service ( ) Information Network 1 /
30 Media Access Control (MAC) (1) Information Network 1 /
31 Media Access Control (MAC) (2) MAC (multiplexing) Information Network 1 /
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