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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 overviewMay to July 2012

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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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BTID Network Change – Major Project Summaries

Network change

Status Programme Number

Summary

MSPE software upgrade.

Status – 3 Core

upgrades remain to be completed

Code upgrade (3.9.1 + SMU patches) is required on the Cisco MSPE to improve platform stability.

• Two upgrades complete since last report – Edinburgh and Preston.• Completion is targeted for 13th June.

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Network change

Status Programme Number

Summary

HT BEA-VS Introduction

Status – Deployment

ongoingIntroduce High throughput BEA-VS into the 21c platform

• 3rd migration at Glasgow completed on 17th May.• Next site will be Colindale on 7th June.• Pre-Olympic scope of this project is 5 sites to be completed by 5 th July.

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4

BTID Network Change – Major Project Summaries

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Network change

Status Programme Number

Summary

2nd Vendor MSPE

Status – Deployment

Ongoing

Introduce 2nd vendor MSPE for WCC and WBMC shared resilience.

• Upgrade of 17th site for WCC resilience complete on 30 th May. 6 more remain to be completed for WCC• Upgrade of 12th device complete for WBMC resilience on 30th May. 1 remain to complete for WBMC shared.

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BTID Network Change – Major Project Summaries

Network change

Status Programme Number

Summary

21c BRAS Software Upgrade

Status – Deployment

Ongoing (37% complete)

Upgrade software on 21c BRAS to fix known defects.

• Defects in the software which will require resolution. • BAU deployment is now proceeding, 74 now upgraded.• Upgrade plan is agreed, current plan for software is to complete by 6 th July.

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Network change

Status Programme Number

Summary

2nd vendor MSAN Software

Upgrade

Status – Deployment

Pending

Upgrade software on 2nd vendor MSAN to fix known defects.

• Resolves software defects.• 183 out of 688 upgrades complete.• Deployment completion due19th June.

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20C Upgrades

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 Planned End

May

June

July

Aug

Edinburgh LPA

Capacity 2/2 Non customer impacting

1 None 0 1 May 12

29 Edinburgh LPA– To meet ongoing 20c usage growth bigger LPA is required.

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21C Upgrades

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

Access MCLAG – removes single point of failure between MSAN (mostly Fibre MSAN which could aggregate several Copper MSAN’s) and Metro Node to improve overall availability

MPLS Core Router Upgrades required as existing software is soon to become “End of Life”. Phase 1 commenced no customer impact. Phase 2 due to commence Dec 11.

MSE Upgrades- Provide BB edge functionality on 7750 switches and additional BB capacity. Achieved by upgrading existing Ethernet Edge devices

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 EndM

ayJune

July

Aug

SVLAN moves Capacity,Stability

Ongoing Av 800Min 0

Max 1000

1 – 5 WBC 35 Up to 75 Ongoing

Access MCLAG

Resilience 460/520 Av 2500Min 0

Max 8000

1 WBC 1 8 - 12 Dec 12

MPLS Core Router Upgrades

Code Update

Phase 183/83 (No Customer impact) Phase 2 23/26

Av 20000Min 0

Max 100000

1 WBMC Phase 1 – No Outage

Phase 2-180

(240 Max)

1-4Jun 12

MSE Upgrades

Capacity 2/70 Various 1 WBCMEAS

ETHERNET

5-8 minutes TBA (will not

start until

2012)

Sept 12

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9

11

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21C Upgrades

Additional BEA capacity is required and this is being achieved by introducing a bigger switch.

To increase platform resilience a 2nd vendor MSPE is being introduced.

21c BRAS software upgrade to increase stability of the platform

Software upgrade which supports new line cards for capacity and stability benefits and also delivers energy efficiency savings.

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 Progress

Planned End

May

June

July

Aug

EEA – EES Backhaul Uplift

Capacity 285/1060 Non Customer impacting

40 None 0 5 Jan13

High ThroughputBEA-VS

Capacity 3/5 Av 120K 1 WBC / WCC

45 mins 1 June 12

2nd Vendor MSPE

Stability 29/51 Av 20k 1 WBC / WCC /

Ethernet

30 secs – 10 mins

2 June 12

BRAS software Upgrade

Stability 74/200 Av 17000Max

32000

1 WBC / WBMC/

WCC

45 mins Up to 50 July 12

Copper MSANSoftware Upgrade

Stability / Capacity

5642/5844 Average 700

120 WBC /WBMC

30 mins 480 May 12

2nd vendor MSAN Upgrade

Stability 183/688 Average 700

40-50 WBC / WBMC/WCC

40 mins 200 - 250 June 12

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22

23

26

27

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

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9

Completed 20C Upgrades

1

14

2

10

Completed 21C Upgrades

3

5

8

10

12

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Completed 21C Upgrades

7

13

19

18

21

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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

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

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16

3

17

28

13

Broadband Services on 21CN

29

279

24

20

628 26

22

23 11

30

14

Ethernet Service on 21CN

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Descriptions

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Management of risk