4. Optics in the Internet SONET Data Center SONET SONET SONET DWDM DWDM Access Long Haul Access Metro Metro
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10. Protection in Ring Network 1+1 Path Protection Used in access rings for traffic aggregation into central office 1:1 Line Protection Used for interoffice rings 1:1 Span and Line Protection Used in metropolitan or long- haul rings
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13. Path Protection / Line Protection Path Switching: restoration is handled by the source and the destination. Normal Operation Line Switching: restoration is handled by the nodes adjacent to the failure. Span Protection: if additional fiber is available. Line Switching: restoration is handled by the nodes adjacent to the failure. Line Protection.
26. Unidirectional Path Switched Ring (UPSR) Signal sent on both working and protected path Best quality signal selected Receiving Traffic N1 send data to N2 N1 N2 Outside Ring = Working Inside Ring = Protection Sending Traffic N4 N3
27. Unidirectional Path Switched Ring (UPSR) Reply Traffic N2 replies back to N1 Receiving Traffic N1 N2 Outside Ring = Working Inside Ring = Protection N4 N3 Signal sent on both working and protected path Best quality signal selected
28. Bidirectional Line Switched Ring (2-Fiber BLSRs) Sending/Receiving Traffic Sending/Receiving Traffic N1 send data to N2 & N2 replies to N1 Both Rings = Working & Protection N1 N2 N4 N3
29. Bidirectional Line Switched Ring (4-Fiber BLSRs) Sending/Receiving Traffic Sending/Receiving Traffic OC-48 N1 send data to N2 & N2 replies to N1 2 Outside Rings = Working 2 Inside Rings = Protection N1 N2 N4 N3
Editor's Notes
BPS2000, Baystack 450 & Passport 8600 (edge ethernet distribution & aggregation) OPTera Packet Edge on OPTera Metro 3000 series & OPTera OC-48 (ethernet over metro optical/Sonet) OPTera Metro 5000 series (ethernet over DWDM) Preside (provisioning & management software) Juniper & Shasta (collateral IP services & routing platforms) Contivity (VPN/secure, encrypted tunnel services)
Migration to IP on Optics simpler, lower cost network robustness & QOS needed for some services
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