Wide area networks (WANS) Chapte Updated Dec 2009 XU Zhengchuan Fudan University
Wide Area Networks (WANs) Chapter 7 Updated Dec. 2009 XU Zhengchuan Fudan University
Orientation Single Networks Layers 1 and 2(so osI standards dominate) Chapters 4-7: Local to long-distance for single networks Chapter 4: Wired Ethernet LANS Chapter 5: Wireless LANS WLANs) Chapter 6: Telecommunications(and Internet Access Chapter 7: Wide Area Networks (WANs) Chapter 8: TCP/IP Internetworking To link multiple single networks 7-2
7-2 Orientation • Single Networks – Layers 1 and 2 (so OSI standards dominate) – Chapters 4-7: Local to long-distance for single networks • Chapter 4: Wired Ethernet LANs • Chapter 5: Wireless LANs (WLANs) • Chapter 6: Telecommunications (and Internet Access) • Chapter 7: Wide Area Networks (WANs) • Chapter 8: TCP/IP Internetworking – To link multiple single networks
/ WAN Concepts Wide Area Networks(WANs) Single networks that connect different sites So Layer 1 and Layer 2 operation WAN Purposes Internet access( Chapter 6) Link sites within the same corporation Provide remote access individuals who are off site 1.Point-to-point Leased Line Network 2. Public Switched Data Networks(PSDNs 7-3
7-3 WAN Concepts • Wide Area Networks (WANs) – Single networks that connect different sites – So Layer 1 and Layer 2 operation • WAN Purposes – Internet access (Chapter 6) – Link sites within the same corporation – Provide remote access to individuals who are off site 1.Point-to-point Leased Line Network 2.Public Switched Data Networks (PSDNs)
Leased Line Networks
Leased Line Networks
Figure 7-2: Leased Line Networks for Voice and Data eased Line voice Network Site A Site B OC3 Leased Line PBⅩ PBX Leased T1 Line Leased Leased line voice Networks Have a 56 kbps Site C Leased PBX at each Site Line 56 kbps PBX Leased Ine Leased 56 kbps Line PBX PBX Leased Line Site D Site e 7-5
7-5 Figure 7-2: Leased Line Networks for Voice and Data OC3 Leased Line T1 Leased Line T1 Leased Line T3 Leased Line 56 kbps Leased Line 56 kbps Leased Line 56 kbps Leased Line Site A Site B Site D Site E Site C Leased Line Voice Network PBX PBX PBX PBX PBX Leased Line Voice Networks Have a PBX at Each Site