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Introduction to 21CN Resilience

Introduction to 21CN Resilience. Tim Hubbard Head of 21CN Solutions Strategy. Proposed topics for discussion. Introducing the new architecture for PSTN 21CN Resilience and security. 21CN – Three key objectives.

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Introduction to 21CN Resilience

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  1. Introduction to 21CN Resilience Tim Hubbard Head of 21CN Solutions Strategy

  2. Proposed topics for discussion Introducing the new architecture for PSTN 21CN Resilience and security

  3. 21CN – Three key objectives • Empower the end user with control, choice and flexibility like never before including communications from anywhere to any device • Offer exciting new servicesfor end user faster than before • Reduce costs and grow cash cost savings - expected to amount to £1 billion per annum by 2008/9 End userexperience & empowerment Speed to market Cost transformation

  4. Today 21CN - evolution A single network that’s physically simpler and more reliable than our existing, complex infrastructure could ever be Up to 50 per cent fewer components in terms of switches, hubs, routers and suchlike. We will be able to deliver the next generation of converged services faster, more efficiently and more cost-effectively than ever before. 21CN

  5. Traditional PSTN architecture • Dedicated hierarchical network of concentrators, local, trunk and tandem exchanges, with fixed relationship between all • Dedicated network of trunks and circuits for voice traffic, each call has its own circuit • Call control traffic and voice traffic directly connected together • Call control and routing carried out by all switches in the network Complex Inflexible Restrictive

  6. MSAN: delivers either copper based or fibre based services to end customers MSAN: Copper version has “combi card” functioning as DSLAM for broadband and concentrator for PSTN MSAN: Converts analogue PSTN speech into VoIP 21CN PSTN – Separating speech and control Metro/Core 21CN MSAN PSTN OCP MSAN

  7. VLAN: Dedicated bandwidth across Ethernet backhaul network (MSAN to Metro Node) for carrying PSTN signalling traffic, PSTN speech traffic, broadband traffic, etc 21CN PSTN – Separating speech and control Metro/Core 21CN MSAN PSTN OCP MSAN

  8. Call Server: Carries out call control, processing dialled digits, setting up and tearing down telephone calls, etc Directory: Holds all PSTN numbers, whether they are on 21CN, legacy PSTN, other CP network. 21CN PSTN – Separating speech and control Metro/Core 21CN MSAN PSTN OCP MSAN

  9. Signalling Firewalls: Gateway for signalling traffic to/from 21CN call server to set up telephone calls to/from 21CN to legacy PSTN and other CP networks Session Border Controllers: Gateway for telephone calls between 21CN and legacy PSTN/other CP networks 21CN PSTN – Separating speech and control Metro/Core 21CN MSAN PSTN OCP MSAN

  10. 21CN PSTN – Separating speech and control- 21CN to 21CN call Metro/Core 21CN MSAN PSTN OCP MSAN

  11. 21CN PSTN – Separating speech and control- 21CN to 21CN call Metro/Core 21CN MSAN PSTN OCP MSAN

  12. 21CN PSTN – Separating speech and control- 21CN to 21CN call Metro/Core 21CN MSAN PSTN OCP MSAN

  13. 21CN PSTN – Separating speech and control- 21CN to 21CN call Metro/Core 21CN MSAN PSTN OCP MSAN

  14. 21CN PSTN – Separating speech and control- 21CN to OCP/PSTN Metro/Core 21CN MSAN PSTN OCP MSAN

  15. 21CN PSTN – Separating speech and control- 21CN to OCP/PSTN Metro/Core 21CN MSAN PSTN OCP MSAN

  16. 21CN PSTN – Separating speech and control- 21CN to OCP/PSTN Metro/Core 21CN MSAN PSTN OCP MSAN

  17. 21CN Resilience Service Ethernet MPLS SDH/WDM D-WDM MSAN Metro Core • Physical: Building, ducts, equipment, fibre, etc • Logical: Optical and packet protocols De-couple each “layer” Recover at the lowest level possible Maintain service availability across 21CN

  18. 21CN Resilient PSTN • Voice • Controlled by call server in Metro/Core Nodes • Each MSAN has at least two routes to its primary call server • Each MSAN will have a primary and secondary call server Core Node Core Node Metro Node Tier 1 MSAN FMSAN CMSAN

  19. 21CN Resilient PSTN • Voice • Controlled by call server in Metro/Core Nodes • Each MSAN has at least two routes to its primary call server • Each MSAN will have a primary and secondary call server Core Node Core Node Metro Node Tier 1 MSAN FMSAN CMSAN

  20. 21CN Resilient PSTN • Voice • Controlled by call server in Metro/Core Nodes • Each MSAN has at least two routes to its primary call server • Each MSAN will have a primary and secondary call server Core Node Core Node Metro Node X Tier 1 MSAN FMSAN CMSAN

  21. 21CN Resilient PSTN • Voice • Controlled by call server in Metro/Core Nodes • Each MSAN has at least two routes to its primary call server • Each MSAN will have a primary and secondary call server Core Node X Core Node Metro Node Tier 1 MSAN FMSAN CMSAN

  22. 21CN Reliability, continuity and resilience • 21CN is a private IP network, NOT the Internet • 21CN separates network and services for increased resilience and faster service delivery • 21CN is engineered with high availability and resilience • 21CN Assurance agreed with Central Sponsor for Information Assurance

  23. Webcall update 18 April Product retirements 24 April 21CN overview 2 May Migration process 22 May CPE compatibility testing programme 31 May Switched-on communications campaign 20 June Pathfinder programme overview 9 July Preparing for 21CN migration 26 July Broadband migration programme 2 August 21CN resilience and security 27 Sept tbc Migration portal overview Industry invited to suggest topics of interest …further webcalls will be scheduled for the rest of 2007

  24. Sources of further information • Information and support for communication providers on the 21CN programme: http://www.btwholesale.com/consult21 • The independent public information website covering the process of migration: http://www.switchedonuk.org • For general information about BT’s 21CN programme go to: http://www.btplc.com/21CN/

  25. Questions  Answers

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