1. DELIVERING BT’S 21 ST 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. MSAN Metro ConcDLE Tandem ~120 sites ~5500 sites ~70 sites ~300 sites ~5500 sites 42 32 55 0 20 40 60 80 100 120 140 Neither At other POC sites At NGS Sites For discussion purposes only. No implementation assurance implied or intended

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

6. MSAN Metro ConcDLE Tandem ~120 sites ~5500 sites ~70 sites ~300 sites ~5500 sites MSAN Metro ~120 sites ~5500 sites MSAN 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 BT’s MPLS core MSAN Metro Node Data Centre location Intelligence Call agents Mgt Local Conc TandemLocal Tandem Conc PNO Metro Node Ofcom request For discussion purposes only. No implementation assurance implied or intended

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

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

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

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

13. DELIVERING BT’S 21 ST CENTURY NETWORK THANK YOU www.btwholesale.com/consult21