DELIVERING BT’S 21 ST CENTURY NETWORK

1. DELIVERING BT’S21ST CENTURY NETWORK INDUSTRY WORKING GROUP ON MSAN ACCESS & INTERCONNECTION 22 October 2004

2. AGENDA • INTRODUCTIONS • PURPOSE OF THE WORKING GROUP • BACKGROUND, VIEWS SO FAR, ISSUES • DISCUSSION • SUMMARY OF ACTIONS / NEXT STEPS

3. BACKGROUND • BT’s POSITION TO DATE • INITIAL INDUSTRY FEEDBACK • Metro-only interconnect could disadvantage PNOs who have built out • Pressure for MSAN interconnect • BT’s DISCUSSIONS WITH VENDORS • QUESTIONS • MSAN access or MSAN interconnect? • voice-only or broadband only? • all 5500 sites or just the 300 DLE sites? • how many PNOs? • EQUIVALENCE • LLU • broadband dial-tone

4. Neither At other POC sites At NGS Sites Tandem Conc DLE ~5500 sites ~300 sites ~70 sites MSAN Metro ~5500 sites ~120 sites 140 120 55 100 80 60 32 40 42 20 0 For discussion purposes only.No implementation assurance implied or intended

5. Tandem Conc DLE ~5500 sites ~300 sites ~70 sites MSAN Metro ~5500 sites ~120 sites For discussion purposes only.No implementation assurance implied or intended

6. MSAN MSAN Metro MSAN ~120 sites ~5500 sites MSAN Tandem Conc DLE ~5500 sites ~300 sites ~70 sites MSAN Metro ~5500 sites ~120 sites For discussion purposes only.No implementation assurance implied or intended

7. THE FOLLOWING SLIDES SHOW SOME POSSIBLE ACCESS AND INTERCONNECT SCENARIOS. THEY ARE FOR DISCUSSION PURPOSES ONLY AT THE WORKING GROUP LEVEL AND ARE NOT PROPOSALS.

8. NETWORK CHANGES Local Tandem Tandem Local Conc Conc PNO Data Centre location Intelligence Ofcom request PNO Mgt Call agents Metro Node Metro Node MSAN MSAN BT’s MPLS core For discussion purposes only.No implementation assurance implied or intended

9. APPROACH 1 - IP CONNECT AT MSAN Data Centre location Intelligence Mgt Call agents BT control of H.248 Gateway Metro Node Metro Node MSAN MSAN BT’s MPLS core PNO signalling passed to BT CA. Media direct to MSAN LGW PoP PoP Other operator’s network Key: Physical BT Signalling PNO Signalling Media For discussion purposes only.No implementation assurance implied or intended

10. APPROACH 2 - TDM CONNECT AT MSAN Data Centre location Intelligence Mgt Call agents MSAN Metro Node Metro Node MSAN MSAN BT’s MPLS core MSAN sites which were formerly Concs parented on DLE are grouped together PoP PoP Other operator’s network Key: Physical BT Signalling PNO Signalling Media For discussion purposes only.No implementation assurance implied or intended

11. NETWORK TOPOLOGY – DLE EQUIVALENT Data Centre location Intelligence Network may be subtended anyhow (in some cases, if cheaper – or needed for resilience). Subtending would be required in “DLE replace” cases. Mgt Call agents Call Server partitioned to match DLE. (Needed anyhow for migration & OSS support ?) BT’s MPLS core Metro Router MSAN MSAN MSAN Lead MSAN at DLE (Non-Metro) site providing PNO Interconnect. MSAN PNO MSANs at “Child” Conc sites. For discussion purposes only.No implementation assurance implied or intended

12. IP CONTROL OF H.248 GATEWAY ? Data Centre location Intelligence Mgt Call agents Metro Node Metro Node MSAN MSAN BT’s MPLS core PoP PoP PoP PoP Other operator’s network Key: Physical BT Signalling PNO Signalling For discussion purposes only.No implementation assurance implied or intended

13. DELIVERING BT’S21ST CENTURY NETWORK THANK YOU www.btwholesale.com/consult21