introduction to 21cn resilience
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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. - PowerPoint PPT PresentationTRANSCRIPT
Introduction to 21CN Resilience
Tim Hubbard
Head of 21CN Solutions Strategy
Introducing the new architecture for PSTN
21CN Resilience and security
Proposed topics for discussion
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
Speed to market
End user experience & empowerment
Costtransformation
21CN - evolution
21CN
IP-MPLS-WDM
DSL
Fibre &Copper
Copper
Agg Box
EndUser
~5.5ksites
~100sites
Class 5 Call Server
Content
WWW
ISP
Multi-service access Converged core
Current thinking. No implementation assurances
Wireless
IP
ATM
PSTN
DPCN
PDH
EndUser
~5knodes
~2knodes
~400nodes
~100nodes
~15nodes
SDH - mesh
~1knodes
SDH - MSH
DSL
KiloStream
PSTN
Fibre
Copper
DWSS
ASDH
CWSS
IP
ATM
PSTN
DPCN
PDH
EndUser
~5knodes
~2knodes
~400nodes
~100nodes
~15nodes
SDH - mesh
~1knodes
SDH - MSH
DSL
KiloStream
PSTN
Fibre
Copper
DWSS
ASDH
CWSS
Today
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.
• 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
Traditional PSTN architecture
21CN PSTN – Separating speech and control
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
MSAN: Converts analogue PSTN speech into VoIP
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
21CN PSTN – Separating speech and control
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
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
MSAN
21CN
PSTNOCP
MSAN
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
MSAN
21CN
PSTNOCP
MSAN
Session Border Controllers: Gateway for telephone calls between 21CN and legacy PSTN/other CP networks
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
21CN PSTN – Separating speech and control- 21CN to 21CN call
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to 21CN call
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to 21CN call
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to 21CN call
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to OCP/PSTN
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to OCP/PSTN
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN PSTN – Separating speech and control- 21CN to OCP/PSTN
Metro/Core
MSAN
21CN
PSTNOCP
MSAN
21CN Resilience
De-couple each “layer”Recover at the lowest level possible
Maintain service availability across 21CN
• Physical: Building, ducts, equipment, fibre, etc
• Logical: Optical and packet protocols
SDH/WDM
Service
Ethernet
MSAN Metro Core
MPLS
D-WDM
21CN Resilient PSTN
Core Node
Core Node
Tier 1MSAN
Metro Node
• 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
FMSAN
CMSAN
21CN Resilient PSTN
Core Node
Core Node
Tier 1MSAN
Metro Node
• 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
FMSAN
CMSAN
21CN Resilient PSTN
Core Node
Core Node
Tier 1MSAN
Metro Node
• 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
FMSAN
CMSAN
X
21CN Resilient PSTN
Core Node
Core Node
Tier 1MSAN
Metro Node
• 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
FMSAN
CMSAN
X
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
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
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/
Answers
Questions