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 January 2014 to March 2014 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 BTW 2012 Network Changes – 3 month rolling plan Whilst BTW has continually worked to enhance its network, we are currently undergoing an exceptional level of change driven by four main drivers:- –Stability – to improve the reliability of the network, BTW is targeting certain network elements with hardware and software improvements. –Capacity – the need for additional capacity is driven by an increase in the number of broadband 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 start between 00:01 and 02:00 with the aim of completing customer impacting work by 06:00. This allows 2 hours for roll-back should the PEW be unsuccessful. Business as usual capacity upgrades and upgrades to resilient structures have not been listed here.

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 Nov Dec Jan Feb SVLAN moves Capacity, Stability OngoingAv 800 Min 0 Max WBC35Up to 75 Ongoing 7750 R10 Upgrade Features (Ipv6), Vendor Support 79/2500Av HE, WBC, WBMC Aug 14 High Throughput BEA-VS Capacity17/20Av 300K1WBC / WCC 45 mins1 Apr-14 BEA-VS Software Upgrade Stability0/20Av 300K1WBC / WBMC / WCC Sub-second1 Apr-14 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 22 Broadband capacity requirement 50 Resolves software defect.

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 Nov Dec Jan Feb ERX BRAS 12.3 EoL79/225Av Min 3000 Max IPSC208 Apr 14 DSLAM SDH Bypass (MSIP Closure) MSIP Platform Closure 473/ IPSC1060 Sep

5 Completed 20C Upgrades k BRAS SB11 Stability 122/122Av Min 3000 Max IPSCUp to 18Apr 13 36

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 Max WBC / WBMC/ WCC 45 minsUp to 50 Jul 12 Copper MSAN Software Upgrade Stability / Capacity 5844/5844 Average WBC / WBMC 30 mins480 May 12 2 nd vendor MSAN Upgrade Stability702/702Average WBC / WBMC/ WCC 40 mins 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

Broadband Services on 21CN

8 Ethernet Service on 21CN

9 Descriptions

10 Management of risk