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© British Telecommunications plc
1
BT Network Teach-in Howard Watson, MD Architecture and Global IT Platforms
BT Group plc
5 March 2013
© British Telecommunications plc
2
BT Chief Architect role
Part of BT Technology, Service & Operations (TSO)
Pan-BT accountability for technology and process
Focused on technology of all IT platforms, networks and
infrastructure
Regularly upgrade IT Platforms with major releases
several times each year
Own all technical delivery for BT’s TV business
© British Telecommunications plc
3
BT Technology, Service & Operations
TSO – a simpler, more end-to-end structure
CIO,
BT GS
CIO,
BT Retail
CIO,
BT Wholesale
CIO,
BT Group
CIO,
Openreach
IT end-to-end
End-to-end service
Research and Innovation
Network end-to-end
Infrastructure end-to-end
© British Telecommunications plc
4
BT Technology, Service & Operations
Simpler for our people so we can deliver better for our
customers
Simplifying our
organisation
Removing
boundaries
Allowing a
view of the
whole lifecycle
Simplifying our
processes
Removing
complexity
Speeding up
delivery
Simplifying our
legacy
Networks
IT platforms
Simplicity to
deliver clarity
Clarity of
accountability
Clarity to
speed up
decision
making
© British Telecommunications plc
5
BT’s UK Network structure
Broadband network structured around regulatory
interfaces
Highly resilient and scalable dual-vendor core
Legacy networks still in place (PSTN, 20C data, ATM)
Opportunity to change broadband architecture over next
few years
© British Telecommunications plc
6
Openreach
Copper Access
Cab
Infinity / FTTC
Home
Fibre Access
20C Broadband
Home
21C Broadband
Home
S
A
N
Infinity / FTTP
Home
BT’s UK Network structure
D
S
L
A
M
Significant investment in fibre and
broadband in recent years
– fibre to more than 13m premises
– WBC (ADSL2+) to more than 90% of UK
Further significant investment in access
layer to reach 2/3 premises with fibre during
spring 2014
– potential to reach >90% in 2017
30000+
© British Telecommunications plc
7
Openreach
Copper Access
Cab
Infinity / FTTC
Home
20C Broadband
Home
21C Broadband
Home 30000+
S
A
N
Infinity / FTTP
Home
BT’s UK Network structure
D
S
L
A
M
Backhaul/ Core
21C Converged Core
X
10
LTV
Head
End
20
20
1200
6000+
WCC
B
R
A
S
M
S
A
N
20C Backhaul
21C core scaled for
broadband and
Ethernet growth
Enhanced by the
addition of content
caches (WCC) and
IP Multicast
Programme in place
to replace 20C
Backhaul (ATM)
Opportunity to re-
architect 21C core
Content
Providers Content
Providers Content
Providers
Fibre Access
D
S
L
A
M
B
R
A
S
© British Telecommunications plc
8
BT’s UK Network structure (as drawn on flip chart)
106 Metro nodes
c.5,500 total exchange buildings
c.1,200 ‘super’ exchanges
20 POSI nodes
LLU operators
connect at this
level
Wholesale operators
connect at this level
Retail Aggregation Nodes (RAN)
Point Of Service
Interconnect nodes at 20
locations around the UK
Main aggregation nodes
within 21C network
c.1,200 Ethernet enabled
exchanges and c.1,200
Openreach Head Ends for
delivering multicast TV
Over time
aggregation and
content caching
will move closer to
the customer
(from POSI node to
‘super’ exchanges)
FTTC operators
connect at this level
© British Telecommunications plc
9
Openreach
Copper Access
Cab
Infinity / FTTC
Home
20C Broadband
Home
21C Broadband
Home 30000+
S
A
N
Infinity / FTTP
Home
BT’s UK Network structure
D
S
L
A
M
Backhaul/ Core
21C Converged Core
X
10
LTV
Head
End
20
20
1200
6000+
WCC
B
R
A
S
M
S
A
N
20C Backhaul
Content
Providers Content
Providers Content
Providers
Fibre Access
D
S
L
A
M
B
R
A
S
Retail
VOSP
Origin
Server
Nagra
Head End
EPG /
Content
Store
RAN
RET
Server(s)
Internet
YouView
Intertrust
Head End
RTMAN/RAN
Network
4
© British Telecommunications plc
10
BT TV multicast network
Nagra
Head End
LTV
Head End
Soft launched in January 2013
End-to-end delivery of linear TV
2 Head Ends
X X
Cab
D
S
L
A
M
1,200 Layer 2
switches
30,000+
cabinets
BT Infinity
homes
© British Telecommunications plc
11
BT TV multicast network
Currently 18 SD plus 4 HD channels
– 150 Mbps to each fibre cabinet to deliver channels
Enhancing the proposition later this year
– upgrading to 500 Mbps to each fibre cabinet to deliver additional
channels
© British Telecommunications plc
12
BT TV multicast network
Multicast on YouView requires a different encryption than
delivery on legacy Vision platform
Simulcrypt allows BT to transmit channels once but
encrypt with two keys
– avoids cost of retransmitting channels twice
© British Telecommunications plc
13
IT Platforms summary
Matrix portfolio architecture used
– applications aligned into functional platforms
– functionality grouped into stacks for each customer-facing
unit
Mixed use of off-the-shelf products (e.g. Oracle) and in-
house
Opportunity for further improvements
– simplify application estate
– reduce number of UK data centres
– significant virtualisation opportunity
© British Telecommunications plc
15
Summary
End-to-end structure allows TSO to improve customer
delivery
Significant network investment has driven improvements
with more to come
Robust linear TV delivery network in place
Opportunity for further IT platform improvements
© British Telecommunications plc
17
Appendix glossary
BRAS Broadband Remote Access Server - routes traffic to and from broadband remote access devices
C2M Concept to Market – the process of creating and delivering new or improved products or processes
DSLAM Digital Subscriber Line Access Multiplexer - a network device, often located in a telephone
exchange or cabinet which connects multiple customer digital subscriber line (DSL) interfaces to a
high-speed digital communications channel using multiplexing techniques
Head End The originating point in a communications system. In TV delivery, the head end is where the
programming originates in the network
ITIL Information Technology Infrastructure Library – a set of practices for IT service management
adopted by many thousands of organisations
L2C Lead to Cash – a set of business processes that begin with a lead and end with the company
receiving cash
LTV Linear Television – channels delivered via IP Multicast
MSAN Multi-Service Access Node - a device typically installed in a telephone exchange or street cabinet
which connects customers' telephone lines to the core network, to provide telephone, ISDN, and
broadband all from a single platform
MTB Manage The Business – the set of applications used to run the business (e.g. HR and finance
systems)
© British Telecommunications plc
18
Appendix glossary
RET Server Retransmission server – used with IP Multicast services to increase quality of delivery by supplying
lost packets on request
RTMAN Retail Traffic Management Node - used to stream the upstream and downstream broadband traffic
through the traffic management equipment to manage the service for the customer
RAN Retail Access Node – the Points of Service Interconnect between the BT Wholesale and BT Retail
networks
SE Service Execution – specific IT applications associated with service delivery to customers (e.g.
voice and TV IT applications)
T2R Trouble to Resolve – process that begins when a customer has told us they are not happy with
either our product or service and ends when that problem has been resolved to the customer’s
satisfaction
UKMN BT UK Media Network - provides live-to-air quality real-time video connectivity between television,
film and other content producers, and broadcasters
WCC Wholesale Content Connect – BT Wholesale product that delivers on demand content efficiently by
caching content deep in the broadband network