1. For discussion purposes. No implementation assurances Interconnect Links and Congruent Call pricing Robin Charles, Clive Feather and Ian Self 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. Consult 21 Interconnect Working Group 20 th January 2006

2. For discussion purposes. No implementation assurances MSIL MSIL goes no further than NTE/Facility Mux on BT Site Rental Price based on technology, line system speed (+distance for CSH) One off connection charge Configuration charges for setting up/configuring VLANs SDH Facility Mux charges included in MSIL Service-specific VLAN charges not included in MSIL price Ethernet VLANs Fibre MSAN Could be located at Metro Node Customer sited NTE In-span Fibre join IP Border Gateway 21CN Core MSIL - ISHMSIL System terminated on Customer Site End User LinePSTN Conveyance CMSANCMSAN Metro Node

3. For discussion purposes. No implementation assurances Fibre MSAN Congruent Call Pricing for PSTN Emulation (PATS/SIP-I): Customer sited NTE In-span Fibre join IP Border Gateway 21CN Core MSIL - ISHMSIL System terminated on Customer Site End User LinePSTN Conveyance (Currently IBC/IEC/ppm) Call conveyance split between VLAN and Call charges. 3 Options for VLAN/Call charge Boundary (VCB) VCB must be identifiable by call server and recorded in CDR CMSANCMSAN Fibre MSAN? Boarder Gateway? Virtual Legacy Switch?

4. For discussion purposes. No implementation assurances Clive’s Matrix Asks about different legacy switches Asks about IECs and long lined switches Asks about capacity rental to Metronodes Answers depend on location of VLAN / Call Boundary  i.e. where are calls charged from

5. For discussion purposes. No implementation assurances Clive Feather Matrix

6. For discussion purposes. No implementation assurances Congruent Call charges - Simple Option A VLAN / Call Boundary at IP boarder gateway (Metronode sites) Calls charged between Border Gateway and CMSAN based on NCC Cheapest Legacy EBC charge from Metronode site to CMSAN site  Ignores legacy switch types  LES rate to all lines formerly parented on any DLEs located at Handover site  ST rate to lines on VDLEs parented on any tandem at Handover site No VLAN distance charges if handover at Metronode site  FMSAN co-located with IP Border gateway Option for VLANs from remote FMSANs at existing POH Customer sited NTE Fibre MSAN In-span Fibre join IP Border Gateway 21CN Core CMSANCMSAN

7. For discussion purposes. No implementation assurances Congruent Call charges - Simple Option B VLAN / Call Boundary at Fibre MSAN gateway Calls charged between FMSAN and CMSAN based on NCC Cheapest Legacy EBC charge from FMSAN site to CMSAN site  Ignores legacy switch types  LES rate to all lines formerly parented on any DLEs located at Handover site  ST rate to lines on VDLEs parented on any tandem at Handover site  De-regulated Tandem to other destinations No VLAN distance charges All calls still routed via Metronode – charge model would change when congruent pricing ceases Customer sited NTE Fibre MSAN In-span Fibre join IP Border Gateway 21CN Core CMSANCMSAN

8. For discussion purposes. No implementation assurances Congruent Call charges - Option C VLAN / Call Boundary at Virtual Legacy Switch No design specified – feasibility not established Requires call server to put VLAN ID in CDR VLAN Distance charge to Location of Virtual Legacy Switch EBC charge band from specific legacy switch to CMSAN Separate VLANs for each virtual legacy switch – more than one per site. Customer sited NTE Fibre MSAN In-span Fibre join IP Border Gateway 21CN Core CMSANCMSAN

9. For discussion purposes. No implementation assurances End