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 Overview November 2015 to February 2016 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 Customer Service / BTID Network Change - Executive Summary 20c DSLAM MSIP to SDH Migration Programme No. 46 REQUIREMENT As part of MSIP platform closure all IP Stream 20c BB data needs to migrated off MSIP platform on to direct SDH transmission. SCOPE To achieve closure 5155 DSLAMS require a migration activity. CUSTOMER IMPACT This migration will impact service for 20c broadband customers on the DSLAM in question for a maximum of 10 minutes. Average of 250 BB EU per migration. PROGRESS COMPLETED 23/10!! 5155 DSLAMS migrated.

3 Customer Service / BTID Network Change - Executive Summary REQUIREMENT The same hardware switch is used to deliver many functions in the 21c platform. These include EEA / EES / IEA / MSE & MSC. Software and hardware upgrades were completed earlier this year on all devices to deliver IPv6 support, maintain vendor support and reduce customer impacting hardware failures. Focus has now moved to patch upgrades to the software to complete the software deployment and also some hardware upgrades which were not possible during the main upgrade phase. SCOPE This second phase of work covers 817 devices. CUSTOMER IMPACT The software upgrade may result in a 8 minute service outage for Broadband end users. This is notified as a 45 minute outage to cover contingency and manual intervention. PROGRESS 778 of the upgrades have been completed and we are on track to complete in January Software / Hardware Upgrade – 21c Core / Metro Programme No. 45

4 Customer Service / BTID Network Change - Executive Summary REQUIREMENT Software upgrade to all primary vendor MSANs. Software upgrades are required on all devices to remove software defects (bug fixes) and deliver improved TV Services. SCOPE A total of 8416 switches require this upgrade. CUSTOMER IMPACT The software upgrade will result in a 10 minute service outage for Broadband end users. PROGRESS 2981 MSAN’s now completed since 2nd June. 41 equipment failures, resolved in PEW window 10 equipment failures, resulting in over-running PEW. No failures outside PEW window since 7 th October Plan is currently on track to complete in April 2016 Primary Vendor MSAN Software Upgrade Programme No. TBA

5 Customer Service / BTID Network Change - Executive Summary IPv6 enablement on existing core / metro devices is ongoing. There is no planned customer impact as a result of this work. Trials have now commenced. MSE progress. There are now more than 5.29 million BB EU supported on 674 MSE. 2015/16 target has now been agreed as 6.7million EU on 800 MSE. Core P router replacement project is progressing well. This project will be transparent to the customers and CP. Driver for this replacement project is platform scaling. Project is on track to complete in early February 16. MSPE software upgrades Software upgrades on the primary vendor MSPE are ongoing. To date 82 of 212 upgrades have been completed without impact to customer service. Other Core / Metro Network Change Updates

6 Customer Service / BTID Network Change - Executive Summary Change volumes for 15/16 are currently running at an average of 257 PEWs per week. This is slightly over BT target volume of 248 per week but with reduced change volumes forecast is in line to complete year on target. Network Change success rates are at 99.93%, which is at best in industry levels on the Quest industry measures. Further Network Change improvement initiatives are planned to continue improved performance. Change Performance

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 EEA / EES / MSE / MSC Upgrade Features (Ipv6), Vendor Support 788/817Av HE, WBC, WBMC Jan 16 P router replacement Platform evolution 186/212No Impact1None 1 Feb 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 Required to support IPv6 and due to current software going end of support 45 Replaces all P routers in core of 21c platform. No impact to end user due to resilience in platform 51

8 Ongoing 20C Upgrades 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 Oct Nov Dec Jan DSLAM SDH Bypass (MSIP Closure) MSIP Platform Closure 5155/5155 COMPLETE 70015IPSC1060 Oct 15 46

Broadband Services on 21CN

10 Ethernet Service on 21CN

11 Descriptions