Transcript INTERCONNECT WORKING GROUP 28 JANUARY 2005

INTERCONNECT WORKING GROUP
28 JANUARY 2005
BT’s Thinking about Next Generation Interconnect in 21CN
DARYL DUNBAR
HEAD OF 21CN CUSTOMER SOLUTIONS
The information in this presentation relates to plans currently under development
and subject to consultation, and may be subject to change. Detailed
implementation depends upon a number of factors including the capabilities of
suppliers and the final 21CN network design.
Interconnection Today
• Distance and Element Based
• Voice Stovepiped
• NNIs for Frame and ATM, not IP
• Partial Private Circuits using PDH/SDH
Vision of Interconnection in 201x
• Converged Fat-Pipe SDH Interconnects (e.g. STM-16)
• Voice as Data Application (e.g. SIP over IP NNI)
• “Death of Distance” (e.g. Handful of Interconnect Pipes at Key Nodes)
Interconnect Transition Planning Parameters
•Demand Drivers for New-Wave Services
• Access Mode and Protocols
• Cost Management
• Commercial Interconnection Products and Regulation
Demand Drivers for Wholesale New-Wave Services
C7 Based Legacy Dial IP
Vol
C7 Based Legacy Voice
SIP Multimedia
Time
• OLO Product Planning for Next-Gen Voice and Data Services
• Service Providers Expected to Enter Voice Market
• Brand New Entrants Expected (e.g. Vonage for Global VoIP)
Access Mode and Products
• Sustain PSTN
• C7-based TDM to NGS Tandems (E1, IUP or ISUP)
• C7-based TDM to 21CN Media GWs (STM-1, UK ISUP)
• Replicate PSTN
• C7 Encapsulated in SIP over IP Transport (SIP-I aka ITU-T Q1912.5)
• Transform PSTN
• SIP over IP NNI (pure-play, no C7 constraint)
• Transform Data NNI
• Would support both SIP and a multi-operator “MPLS-like” data standard
Cost Management
• Line Cost Optimisation
• BT recognises the need of our customers to predictably optimise line cost
• But, flattening the network is beneficial to all in the long term
• And converged interconnection will reduce all our costs
• Re-Arrangement Cost Minimisation
• BT recognises that re-arrangement of interconnect circuits is costly
• So, we are working on a plan that minimises forced TDM migration
• While we mutually plan for next-generation interconnects
Legacy Interconnect Proposal Details Follow Later Today
Interconnect Product Prioritisation
Sustain
Replicate
(C7 over TDM)
(C7 encapsulated
in SIP over
IP Transport)
Transform
(Pure-Play SIP over IP NNI)
• How should we prioritise?
• Classic problem: Together we can do 2 well, but doing 3 is very hard
• We must Sustain; but, should second be Replicate or Transform?