1. 1 The information contained in this Presentation is confidential information as per your terms and conditions with British Telecommunications plc (BT). Please treat it accordingly and do not forward, republish or permit unauthorized access. BT reserves the right to make changes to the information in this Presentation at any time without further notice. BTW Planned Engineering Works 90 day overview December 2014 to February 2015 These dates are indicative dates only and not to be used for any forecasting purposes as they are all subject to change. Please ensure that you wait for formal notifications from IRAMS.

2. 2 BTW Network Changes – 3 month rolling plan BTW continually works to enhance its network, whilst minimising customer disruption. The four main drivers for change are:- –Stability – to improve the reliability of the network. –Capacity – the need for additional capacity is driven by an increase in the number of broadband and Ethernet users on the 21C network (through migration from 20C and growth) and also by the ever-increasing bandwidth demands of those users. –Resilience –to improve the resilience of the network, BTW is actively removing single points of failure from the network –New Functionality – to meet the needs of the market BTW needs to enhance its network to deliver the services its customers require. This presentation outlines the key upgrade programmes, their drivers, customer impact and the number of upgrades per programme per week. BTW is keen to deliver all the required improvements as quickly as possible whilst actively managing the risk to customers. For this reason a range of run- rates against each programme has been outlined. The actual run-rates achieved will be determined by this ongoing live analysis of risk. Customer outage times for the PEWs normally start at 02:00 with the aim of completing customer impacting work by 06:00. Business as usual capacity upgrades and upgrades to resilient structures have not been listed here.

3. 21C Upgrades Prog No: UpgradeKey DriversUpgrades Complete / Total EUs per upgrade Upgrades per PEW Affected Products Av. End user outage (Mins) Upgrade s per week Progress Planned End Dec Jan Feb Mar SVLAN moves Capacity, Stability OngoingAv 800 Min 0 Max 1000 9WBC35Up to 75 Ongoing EEA / EES / MSE / MSC Upgrade Features (Ipv6), Vendor Support 871/2242Av 3000 1HE, WBC, WBMC 10 80 June 15 BEA-VS Software Upgrade Stability18/20Av 300K1WBC / WBMC / WCC Sub-second1 Jan 15 P router replacement Platform evolution 34/212No Impact1None 1 April 16 6 SVLAN moves - these moves offload SVLAN’s (bundles of Broadband traffic) from one BRAS to another. This is carried out to alleviate capacity issues mplet 45 Required to support IPv6 and due to current software going end of support 50 Resolves software defect. Replaces all P routers in core of 21c platform. No impact to end user due to resilience in platform 51

4. 4 Ongoing 20C Upgrades Cont’d Prog No: UpgradeKey DriversUpgrades Complete / Total EUs per upgrade Upgrades per PEW Affected Products Av. End user outage (Mins) Upgrad es per week Progress Planned End Dec Jan Feb Mar DSLAM SDH Bypass (MSIP Closure) MSIP Platform Closure 3071/462070015IPSC1060 Dec 14 46

5. 5 Completed 20C Upgrades 1 14 2 BRAS SB11 Stability 122/122Av 11000 Min 3000 Max 18000 6IPSCUp to 18Apr 13 BRAS 12.3 EoL225/225Av 11000 Min 3000 Max 18000 IPSC208May 14 36 44

6. 6 Completed 21C Upgrades Progr No: UpgradeKey Drivers Upgrade s Complet e / Total BB EUs and/or Ethernet Circuits per upgrade Upgrad es per PEW Affecte d Product s Av. End user outage (Mins) Upgrades per week Date Ended BRAS software Upgrade Stability193/193 Av 17000 Max 32000 1WBC / WBMC/ WCC 45 minsUp to 50 Jul 12 2 nd vendor MSAN Upgrade Stability702/702Average 700 40-50WBC / WBMC/ WCC 40 mins200 - 250 Jul 12 2 nd Vendor MSPE Stability51/51Av 20k1WBC / WCC / Ethernet 30 secs – 2 mins 2 Jan 13 2 nd Vendor MSPE Software Upgrades Functionalit y (LAG Support) 67/67Non Service Impacting 0None04 Dec 13 High Throughput BEA-VS Capacity20/20Av 300K1WBC / WCC 45 mins1 26 3030 23 38 22

7. Broadband Services on 21CN 1 2 4 6 9 11 14 20 22 23 26 28 29 31 32 27 38 34 40 34 35 36 37 39 44 45 46 47 48 11 52 49 46 39 50 51

8. 8 Ethernet Service on 21CN

9. 9 Descriptions

10. 10 Management of risk