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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 overview August 2014 to October 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.

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BTW Network Changes – 3 month rolling plan

• BTW continually works to enhance its network, whilst minimising customer disruption. The four main drivers for change are:-

– Stability – to improve the reliability of the network. – Capacity – the need for additional capacity is driven by an increase in the number of broadband and ethernet

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 normally start at 02:00 with the aim of completing customer impacting work by 06:00.

• Business as usual capacity upgrades and upgrades to resilient structures have not been listed here.

21C UpgradesProg 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 EndA

ugSep

Oct

Nov

SVLAN moves

Capacity,Stability

Ongoing Av 800Min 0

Max 1000

9 WBC 35 Up to 75 Ongoing

EEA / EES / MSE / MSC Upgrade

Features (Ipv6), Vendor Support

223/2500 Av 3000 1 HE, WBC, WBMC

10 80

June

15

BEA-VS Software Upgrade

Stability 9/20 Av 300K 1 WBC / WBMC /

WCC

Sub-second 1

Oct 14

P router replacement

Platform evolution

15/212 No Impact 1 None None 1

April

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

45

Required to support IPv6 and due to current software going end of support

50

Resolves software defect.

Replaces all P routers in core of 21c platform. No impact to end user due to resilience in platform

51

Microsoft Excel Worksheet

Microsoft Excel Worksheet

4

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 EndA

ugSep

Oct

Nov

DSLAM SDH Bypass (MSIP Closure)

MSIP Platform Closure

1821/4620 700 15 IPSC 10 60Dec 14

46

5

Completed 20C Upgrades

1

14

2

BRAS SB11 Stability 122/122 Av 11000Min 3000

Max 18000

6 IPSC Up to 18 Apr 13

BRAS12.3

EoL 225/225 Av 11000Min 3000

Max 18000

IPSC 20 8 May 14

36

44

6

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

BRAS software Upgrade

Stability 193/193 Av 17000Max 32000

1 WBC / WBMC/

WCC

45 mins Up to 50 Jul 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

2nd Vendor MSPE Software Upgrades

Functionality(LAG Support)

67/67 Non Service Impacting

0 None 0 4 Dec 13

High ThroughputBEA-VS

Capacity 20/20 Av 300K 1 WBC / WCC

45 mins 1

26

30

23

38

22

Broadband Services on 21CN

12

46

9

11

14

20 22

23

2628

29

31

3227

3834

40 3435

36

3739

44

45

45

45

45

46

47 48

1152

4946

39

3950

51

8

Ethernet Service on 21CN

9

Descriptions

10

Management of risk