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OCR: BARTNET CANTRAL SYSTEM VIEW Fremont Server Dublin Concord Richmond Oakland 48 T-S links to TOD SODI FOR Ring Ring Ring Switching Central control System Router train control hub computers Fasì Pacific Bell Disaster recovery Ethernet LAN and bandwidth on demand Central Router Ank hubs Internet connection backbone Central network management Central control system Router Switched system workstation Ed DNS ntemnet Router huti LAN hubs access Firewall FDO! External DNS and Web server Network Jab Network lab intemal Web Backup network and mail server Management Desktop LAN hub system computers Figure 1. BART's central IAN connects the Lake Merritt station and the planning and development center. All station information and train traffic is routed through the LAN.