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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 overviewMarch 2013 to June 2013These 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.

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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 04:00. 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.

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Customer Service / BTID Network Change - Executive Summary

• As a pre-requisite of a transmission migration to SDH platform the LPA’s in the 20c platform require a software upgrade.

• Due to resilience design upgrade is non-impacting to EU. • However each LPA pair supports large numbers of EU. Failure Assessment : Low risk,

high impact.• Deployment is due to commence on 29/1/13 and complete by first week of April and has

TSO senior management sign off.• Reading has completed this week.• Next site is Sheffield on 12th and 14th March.• Edinburgh, Ealing, Birmingham, Manchester, Milton Keynes and Reading are complete.

• PBR enhancement has completed FOA.• Colindale and Southbank are complete.• Next is Slough on 19th March.

20c LPA Upgrades

PBR Changes for BTR

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Customer Service / BTID Network Change - Executive Summary

Deployment Priorities Feb – Apr 2013

Prog

No:

Upgrade Key Drivers Total Upgrades

Average EU Impact per upgrade

Affected Products

Average EU outage (Mins)

Upgrades per week

Target Months Targat End

Feb

Mar

Apr

May

LAG Deployment Resilience, scaling, stability. IEA-P, EEA-P, P-P, MSPE-P

TBC 0 None 0 4 Ongoing

500G IEA chassis upgrade

Scaling 4 port 10G line-card

TBC TBC TBC TBC TBC TBA

2nd vendor P card Upgrade

Scaling 11 0 None None 2 TBA

MSE Migrations Scaling, Functionality

200k EU 1500 - 18000 WBC / WBMC 5 6000 - 72000

Ongoing

20c 2nd vendor BRAS Upgrade

Vendor Support,

TBC 7000 20c BB 20 5 TBA

21c EES, EEA, IEA, MSE Upgrade

Vendor support, Functionality

Approx 2500. 6000 HE, WBMC, WBC

20 75 Dec 13

39

40

41

42

44

45

5

Ongoing 21C UpgradesPro

g No:

Upgrade Key Drivers Upgrades Complete / Total

EUs per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per week

Progress Planned

EndFeb

Mar

Apr

May

SVLAN moves

Capacity,Stability

Ongoing Av 800Min 0

Max 1000

9 WBC 35 Up to 75Ongoing

EEA – EES Backhaul Uplift

Capacity 1052/1060 Non Customer impacting

40 None 0 5Mar 13

CRS SMU Upgrades

Stability 33/52 Non Customer impacting

1 None 0 16 Mar 13

HT-BEA IOS-XR Upgrade

Functionality 4/6 Average 200k

1 WBC / WCC

15 mins 1 Mar 13

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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

24 EEA – EES 7750 Lag Migration - This change provides increased scalability .

31 Software upgrade to increase platform stability.

35 Software upgrade to support BTR 40G Product requirements

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Ongoing 21C Upgrades Cont’dProg No:

Upgrade Key Drivers Upgrades Complete / Total

EUs per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per week

Progress Planne

d EndFe

bMar

Apr

May

BRAS 11.1.2.5 P8 Upgrade

Functionality (IPv6), stability.

27/257 BB EU’s per BRAS

Av 35000Max 45000

6 WBC / WBMC

45 Up to 24

Jun-13

High ThroughputBEA-VS

Capacity 7/10 Av 120K 1 WBC / WCC

45 mins 1 Jun-13

2nd vendor MSPE Software Upgrade

Functionality (Lag Support), stability.

2/80 None 1 None None 4 May-13

SVLAN moves - these moves offload SVLAN’s (bundles of Broadband traffic) from one BRAS to another. This is carried out to alleviate capacity issues mplet37

22

38

HT-BEA- Capacity requirement for bigger switch. 13 slot device replacing 9 slot device

Capacity – Software upgrade to replace software which is going out of vendor support.

Microsoft Excel Worksheet

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Ongoing 20C Upgrades Cont’d

Prog No:

Upgrade Key Drivers Upgrades Complete / Total

EUs per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per week

Progress Planne

d EndD

ecJan

Feb

Mar

10k BRAS SB11

Stability 93/122 Av 11000Min 3000

Max 18000

6 WBC 35 Up to 18

Feb 13

36

Microsoft Excel Worksheet

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Completed 20C Upgrades

1

14

2

9

Completed 21C Upgrades

Progr No:

Upgrade Key Drivers

Upgrades Complete / Total

BB EUs and/or Ethernet Circuits per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per week

Date Ende

d

Copper MSAN Upgrade

Functionality

5594/5594 Non-Customer Impacting

Up to 120

None 0 Up to 480 Dec 11

EAD Chassis Code Upgrade

Stability 6950/6950 Up to 15 Ethernet Circuits

Up to 200

Ethernet,Mobile

Ethernet

<1 Up to 1000

Feb 12

21C BRAS Core Migration

Capacity 151/151 Non Customer Impacting

Up to 12 WBC 0 16-30 Feb 12

BEA VS Card Upgrade

Capacity 20/20 – Complete

Non-Customer Impacting

1 None 0 Up to 4 Mar 12

DDR Hardware replacement

Stability 200/200 Non Customer impacting

10 None 0 50 May 12

15

16

3

17

28

10

Completed 21C Upgrades

Progr No:

Upgrade Key Drivers

Upgrades Complete / Total

BB EUs and/or Ethernet Circuits per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per wee

Date Ende

d

EAD Chassis Code Upgrade

Stability 6950/6950 Up to 15 Ethernet Circuits

Up to 200 Ethernet,Mobile

Ethernet

<1 Up to 1000

Feb 12

21C BRAS Core Migration

Capacity 151/151 Non Customer Impacting

Up to 12 WBC 0 16-30 Feb 12

BEA VS Card Upgrade

Capacity 20/20 – Complete

Non-Customer Impacting

1 None 0 Up to 4 Mar 12

DDR Hardware replacement

Stability 200/200 Non Customer impacting

10 None 0 50 May 12

MPLS Core Router Upgrades

Code Update 109/109

Av 20000Min 0

Max 100000

1 WBMC180

(240 Max)

1-4 Jun12

16

3

17

28

11

11

Completed 21C Upgrades

Progr No:

Upgrade Key Drivers

Upgrades Complete / Total

BB EUs and/or Ethernet Circuits per upgrade

Upgrades per PEW

Affected Products

Av. End user outage (Mins)

Upgrades per week

Date Ende

d

High ThroughputBEA-VS

Capacity 5/5 Av 120K 1 WBC / WCC

45 mins 1 Jun 12

BRAS software Upgrade

Stability 193/193 Av 17000Max 32000

1 WBC / WBMC/

WCC

45 mins Up to 50 Jul 12

Copper MSANSoftware Upgrade

Stability / Capacity

5844/5844 Average 700

120 WBC /WBMC

30 mins 480 May 12

2nd vendor MSAN Upgrade

Stability 702/702 Average 700

40-50 WBC / WBMC/WCC

40 mins 200 - 250 Jul 12

2nd Vendor MSPE

Stability 51/51 Av 20k 1 WBC / WCC /

Ethernet

30 secs – 2 mins

2 Jan 13

22

26

27

30

23

Broadband Services on 21CN

12

46

9

12

11

11

14

20 22

23

2628

29

31

3227

3834

40 3435

36

37

39

44

4545

45

45

13

Ethernet Service on 21CN

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Descriptions

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Management of risk