Broadband & LLU Working Group 21 st February 2006

1. Broadband & LLU Working Group 21st February 2006 Current Thinking on Colossus & 21CN Connectivity

2. Forward Looking Statements – Caution Advised • Certain statements in this presentation are forward-looking and are made in reliance on the safe harbour provisions of the US Private Securities Litigation Reform Act of 1995. These statements include, without limitation, those concerning: BT's plans for transformation of its networks; benefits to customers of the 21CN programme; key milestones and expected timetable for delivery of 21CN; and the benefits in relation to, for example interconnect, convergence and broadband. • Although BT believes that the expectations reflected in these forward-looking statements are reasonable, it can give no assurance that these expectations will prove to have been correct. Because these statements involve risks and uncertainties, actual outcomes may differ materially from those expressed or implied by these forward-looking statements. • Factors that could cause differences between actual outcomes and those implied by the forward-looking statements include, but are not limited to: material adverse changes in economic and financial markets conditions in the markets served by BT; supplier arrangements; future regulatory actions and conditions in BT’s operating areas; technological innovations; developments in the convergence of technologies and the anticipated benefits and advantages of new technologies, products and services, including broadband, not being realised.

3. Outer core connectivity Inner core connectivity Inner core PoP - 8 21CN Core to Colossus Links Outer core PoP - 12 21CN Core to Colossus Backup Links Colossus PoP - 5 Co-located 21CN Core & Colossus PoP - 5 21CN Core Node Locations • It is expected Colossus nodes may continue to grow at the start of 21CN • For the future, BRASs are planned to be in the ~20 currently planned 21CN core nodes compared to the 10 Colossus nodes of today The information on this slide represents current thinking only and is liable to change and no assumptions on the commercial availability of future products & services should be made

4. 21CN Core Node Connectivity 4 + 4 3 + 3 4 + 3 4 + 3 0 + 2 Primary PoP FAR BIR MAN MIL SHE Backup PoP LEE COL DER PET NEW SBK STE SLO GUI WOL PRE FAL GLA CAR BRI The information on this slide represents current thinking only and is liable to change and no assumptions on the commercial availability of future products & services should be made

5. 21CN to Colossus Connectivity Colossus Backbone COLOSSUS COLOSSUS COLOSSUS COLOSSUS COLOSSUS COLOSSUS COLOSSUS COLOSSUS CORE 1 CORE 1 CORE 2 CORE 2 CORE 1 CORE 1 CORE 2 CORE 2 L3 SW 1 L3 SW 1 L3 SW 2 L3 SW 2 L3 SW 1 L3 SW 1 L3 SW 2 L3 SW 2 SIN329 Interface Option • Current thinking for connectivity at non co-located nodes L2 SW 1 L2 SW 1 L2 SW 2 L2 SW 2 L2 SW 1 L2 SW 1 L2 SW 2 L2 SW 2 BRAS x 8(max) BRAS x 8(max) BRAS x 8 (max) BRAS x 8 (max) ETH AGGREGATION ETH AGGREGATION ETH AGGREGATION ETH AGGREGATION GE Links 10 GE DWDM (Primary) LEGEND 10 GE links 10 GE DWDM (Secondary) The information on this slide represents current thinking only and is liable to change and no assumptions on the commercial availability of future products & services should be made

6. L3 SWITCH 1 L3 SWITCH 1 L3 SWITCH 1 L3 SWITCH 1 BRAS BRAS 21CN to Colossus Connectivity COLOSSUS POP COLOSSUS BACKBONE LEGEND CORE ROUTER 1 CORE ROUTER 2 GE Links 10 GE links • Shows current thinking for local connectivity at 21CN and Colossus co-located nodes SIN329 Interface Option Local Logical BRAS POP Up to 8 BRASs Core Side Subscriber Side ETHERNET AGGREGATION ETHERNET AGGREGATION The information on this slide represents current thinking only and is liable to change and no assumptions on the commercial availability of future products & services should be made