1. BT TDM on 21CN – Consult 21 Utilities Webcall Laurie Dennard– BT Group Martin Wade – BT Design Bill Du Cann – Consult21 December 10th, 2007 Issue 1.0

2. © British Telecommunications plc Page 1 The Objectives of the Webcall Share BT Wholesales portfolio proposals for TDM on 21CN Summarise the Consultation process and key messages Replay feedback already received Address some of the Utilities specific concerns Share the Consultation plan and timeline Gain your feedback through a Q&A session

3. © British Telecommunications plc Page 2 Disclaimer BT's 21st Century Network is still in the process of development and the subject of consultation. The information in these slides may be subject to change at any time without further notice and exclusive reliance on the information in these slides is at your own risk. BT has taken reasonable care to check that the information contained in this document is accurate at time of publication. In relation to any products/services referred to in this presentation which are currently under development and/or trial, BT gives no undertaking or other commitment that the product/service will be made commercially available. With the exception of any products which have already been launched, any notification timescales, launch dates and pricing information provided is indicative only and will, where applicable, be subject to the successful outcome of any trial and to any legal and regulatory approvals being given

4. © British Telecommunications plc Page 3 Agenda Introductions The Industry Consultation Process Summary of key Consultation messages –Product Annex from Consultation document Utilities FAQs Timeline for the Consultation period Q&A

5. © British Telecommunications plc Page 4 Industry Consultation Explained The Consultation process: –The Industry Consultation period is for BT Wholesale to consult with CPs on the future of products on the 21CN, before making final decisions on its 21CN portfolio –An Industry Consultation document is a set of proposals for comment, for comment from Industry, so the information shared with you today is not set in stone –After the consultation period is complete and BT has considered all responses from the CPs, it will issue a Consultation Closing Document Some CPs have sent BT their responses to a set of questions from the Consultation document The Closure document publishes those responses (anonymously), tries to answers any questions raised by CPs and set out BTs final statements –After the Closure Document is issued the Consultation is closed and BT Wholesale will commence development of the 21CN TDM portfolio –The statements within the Consultation document are issued by BTWholesale and only refer to BTWholesale products –Global Services are treated as any other CP in the Consultation process and therefore are not in a position to provide full plans on their 21CN portfolio until sometime after the final Consultation position is published

6. © British Telecommunications plc Page 5 TDM Industry Consultation Proposals Summary 20C Legacy 2Mb and above services Extend SDH platform life from 2011 to Q1 2014 Introduce Next Generation 21C product options Stop/ sell 20C services when 21C alternatives are available and withdraw all 20C products by Q1 2014 21C Ethernet (from 2008) 21C Native TDM (from 2009) Migrate to 21C service CP led migration from 2009 BT led migration from 2012 20C Legacy Sub 2Mb services inc AoD Extend DPCN platform life from 2011 to Q1 2014 Introduce Next Generation 21C product options Stop/ sell 20C services when 21C alternatives are available and withdraw all 20C products by Q1 2014 Broadband (from today) 21C Native TDM (from 2009) Migrate to 21C service CP led migration from 2009 BT led migration from 2012

7. © British Telecommunications plc Page 6 Product Listing (Annex A of Consultation Document) * No direct 21CN replacement product at this speed ** Subject to 21CN availability *** Subject to demand (if there is insufficient demand BT may withdraw earlier).

8. © British Telecommunications plc Page 7 Utilities FAQs – Design What performance can I expect from the 21CN Native TDM solution? –21CN TDM will be based on Next Generation SDH and will be carried natively in 21CN –We are aiming to offer the same customer experience as current 20CN product performance What happened to TDM emulation? –BTs feasibility on TDM emulation showed that it cannot meet the delay or jitter requirements for strict TDM performance, so BT does not currently plan to introduce an emulated TDM service. –BT may reconsider this position if the technology matures to a performance level acceptable in the marketplace Will BT need to change my current access network? –It is anticipated that the majority of 20CN TDM access network will be retained to work with the 21CN –This also applies to PPC Point Of Handover & 3 rd party tails Can customers see BT 21CN node data & rollout plans? –CPs have access to some of this information, end customers ordinarily would not What is the life expectancy of alternative 21CN products? –We have no plans for withdrawal of 21CN products currently but would expect to withdraw them when they are no longer viable, due to low demand What resilience & switching options will be available for TDM on 21CN? –Similar resilience configurations would be available to those currently provided

9. © British Telecommunications plc Page 8 Utilities FAQs – Service When will customers get to see 21CN TDM product pricing? –This is likely to be late 2008, at the earliest Would there be a fixed time between stop sell and product withdrawal? –We expect that to be no shorter than 2 years but there will not be a fixed time as it will depend on how far ahead of the 20CN platform closure the stop sell date is issued When will customers have an indication of product mapping and stop sell dates? –The current product mapping plan is shown on slide 6 –Stop sell dates announcement will be co-ordinated with their 21CN replacement launch announcement Can BT clarify what is meant by support services on 20CN until Q1, 2014 subject to demand? –If the migration of services away from the 20CN platforms occurs more quickly than expected, then BT may decide to close the platform before 2014 What is happening with EPS type circuits & non-own exchange circuits –Analogue circuits, non-own exchange, would be mapped to a 64Kb 21CN alternative –Analogue circuits, own exchange, are not impacted by this consultation Life expectancy of alternative 21CN products –No current end of life dates for 21CN TDM products Do utilities have to repay connection charges when migrating to 21CN –Only when changing bandwidth, or when moving to a different product i.e Ethernet

10. © British Telecommunications plc Page 9 Timeline Consultation period: Completed October 22 nd - November 30 th BT produce draft Closure document:December 19 th (est.) Industry provide comment on draft Closure document January 18th th 2008 (TBA) BT produce final Closure document January 31 st 2008 (TBA) 21CN Product launch announcements/pricing information Q4 2008 (at earliest) 21CN TDM Product launch2009 onwards 20CN TDM product stop sell2009 onwards Closure of 20CN platformsEnd of Q1, 2014

11. © British Telecommunications plc Page 10 Answers Questions

12. © British Telecommunications plc Page 11 Useful websites Switched-on website http://www.switchedonuk.org 21CN website http://www.btplc.com/21CN/ Consult21 website http://www.btwholesale.com/consult21