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 overviewFebruary 2013 to May 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

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

Jan

Feb

Mar

Apr

2nd vendor MSPE Upgrade

Functionality(LAG Support)

80 Non-service impacting

None 0 5 May 13

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 TBC TBC TBC TBC TBC TBA

MSE Migrations Scaling, Functionality

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

Ongoing

MSE Infrastructure & CP Build

Scaling 420 Non-service impacting

None 0 4 Ongoing

38

39

40

41

42

43

4

Customer Service / BTID Network Change - Executive Summary

Deployment Priorities Sept – Dec 2012 – Customer View WBMC Dedicated

Device Programme Sept Oct Nov Dec

Primary Vendor MSANNone

2nd vendor MSANMR7 upgrade 5 0 0 0

BRASSVLAN Move 35 35 35 3511.1.2.x Software Upgrade 0 0 60 60

MSECustomer onboard 5 5 5 5TVC 500M EEA - MSE upgrade 0 0 5 5

HT-BEAHT-BEA migration 0 45 45 45HT-BEA sw upgrade (BTR 40G) 0 40 40 40

Planned Upgrade Programmes and EU outage in minutes.

Notes –

No customer could be impacted by every outage. e.g. A customer would not be impacted by both HT-BEA migration and HT-BEA sw upgrade.

Difficult to assess what this means for a typical customer.Next steps – Proposal attached

Microsoft Excel Worksheet

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

EndDec

Jan

Feb

mar

SVLAN moves

Capacity,Stability

Ongoing Av 800Min 0

Max 1000

9 WBC 35 Up to 75Ongoing

Access MCLAG

Resilience 460/520 Av 2500Min 0

Max 8000

1 WBC 1 8 - 12 Mar13

EEA – EES Backhaul Uplift

Capacity 1041/1060 Non Customer impacting

40 None 0 5Jan 13

2nd Vendor MSPE

Stability 51/51Complete

Av 20k 1 WBC / WCC /

Ethernet

30 secs – 2 mins

2 Jan13

CRS SMU Upgrades

Stability 33/52 Non Customer impacting

1 None 0 16 Mar 13

HT-BEA IOS-XR Upgrade

Functionality 1/6 Average 200k

1 WBC / WCC

15 mins 1 Mar 13

6

9

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 availability24

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

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

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 EndD

ecJan

Feb

Mar

BRAS 11.1.2.5 P8 Upgrade

Functionality (IPv6), stability.

12/248 BB EU’s per BRAS

Av 35000Max 45000

6 WBC / WBMC

45 Up to 24Apr-13

High ThroughputBEA-VS

Capacity 7/10 Av 120K 1 WBC / WCC

45 mins 1 Mar-13

2nd vendor MSPE Software Upgrade

Functionality (Lag Support), stability.

0/80 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

7

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 17/122 Av 11000Min 3000

Max 18000

6 WBC 35 Up to 18 Feb 1336

8

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

22

26

27

30

Broadband Services on 21CN

12

46

9

12

11

11

14

20 22

23

2628

29

31

3227

3834

40 3435

36

37

39

13

Ethernet Service on 21CN

14

Descriptions

15

Management of risk