Transcript BT`s Plan for its new generation IP based network

BT’s Plans for its NGN
EU Open Workshop on NGN Policy and
Regulatory Issues
22 June 2005
Ittai Hershman
Director, 21CN Commercial Development
BT Wholesale
[email protected]
CAUTIONARY STATEMENT
The material in this presentation represents current general
technical thinking on how a converged IP network could be
implemented. It does not necessarily represent BT's plans.
The details of BT's 21st century network are still in the
process of development and the subject of consultation.
THE CHANGING
LANDSCAPE
• Convergence is gaining
momentum
• Convergence needs an
underlying infrastructure
to deliver and support it
• End users want more
choice, flexibility and
control
• Simplicity is key
OUR CURRENT NETWORK
PSTN
Copper
PSTN
Leased lines
KStream
ATM
DSL
PDH Access
IP
Fibre
PDH
Access
SDH VC-12
SDH - VC-4
Access SDH
PDH
End
User
~5.5k
sites
~2k
sites
~1k
sites
~300
sites
~100
sites
~15
sites
21CN - OUR SIMPLIFIED NETWORK
Muilti-service access
Converged Core
Class 5
Call Server
Copper
WWW
DSL
Fibre
IP-MPLS-WDM
Aggregation
Content
End
User
~5.5k
sites
~130
sites
For discussion purposes.
No implementation assurances
ISP
INDUSTRY CONSULTATION
• Consult21 launched Summer 2004
• Director recruited from industry
• 8 Working Groups, comprising:
-
Product Migration from Legacy to 21CN
(E.g. Legacy Interconnect, PPCs, Broadband)
-
21CN Migration Management
Next Generation Solutions
( E.g. NGN Interconnect, Network Capabilities)
• Each WG has BT and Industry Co-Chairs
• Industry Steering Board (Ofcom monitors)
• All proceedings published on the Internet
NGN INTERCONNECT
• Converged Point of Handover
- Multi-service pipe between two operators
- Architecture (i.e. standards) to be agreed at NICC
• Service Specific Conveyance
- Multiple services will be conveyed across a PoH
- Some will be price controlled (e.g. PSTN), others won’t
- Some will require service specific network elements
- Some services can be defined today, others can’t
For discussion purposes.
No implementation assurances
HOW DEEP SHOULD PoH BE?
• BT proposed PoH at ~130 Metro node sites
• Some Operators want deeper PoH, because:
- They have existing fibre assets that may be stranded
- They want to leverage LLU investments
- They want to intermediate the wholesale market
- They believe conveyance will be cheaper
• Ofcom wants deeper PoH, because:
- Policy of promoting infrastructure build
- Greater competition for backhaul
For discussion purposes.
No implementation assurances
POTENTIAL HANDOVER POINTS
CORE
DWDM
4/4/3
SDXC
P
Router
~10 Sites
Core Node
Metro Node
Metro Node
Voice/P
C
PE
Edge
~WDM
Edge
~WDM
P
Router
4/4/3
SDXC
Legacy
switch
function
s
Ethernet
PE
4/4/3
SDXC
Legacy
switch
function
s
~130 Sites
CORE
DWDM
BRAS
Voice
Voice/P
C
PE
CORE
DWDM
Ethernet
PE
BRAS
Voice
P
Router
Intra Metro Ethernet
Network
Intra Metro Ethernet
Network
Tier 1 MSAN Node
Tier 1 MSAN Node
Edge
WDM
FMSAN
T
A
M
T
A
M
Edge
WDM
CMSAN
FMSAN
Lega
cy
Lega
cy
~1500 Sites
CMSAN
MSAN Node
MSAN Node
FMSAN
T
A
M
MSAN Node
FMSAN
FMSAN
CMSAN
T
A
M
Legacy
CMSAN
T
A
M
CMSAN
Legacy
Legacy
~4500 Sites
MSAN Node
CMSAN
~5500 Sites
T
A
M
CMSAN
Legacy
For discussion purposes.
No implementation assurances
T
A
M
Legacy
SERVICE CONVEYANCE PROTOCOLS
C7 PSTN REPLICATION
SIP-I
RTP
MULTIMEDIA
ATM
SIP
PNNI
RTP
NGN PPC
Circuit
Emulation
SCTP
UDP
SCTP
UDP
Ethernet Glue Layer
Point of Handover
Note: ATM and Circuit Emulation over Ethernet subject to further standards work.
For discussion purposes.
No implementation assurances
ATM over
Ethernet
STANDARDS CHALLENGES
• Many fora developing open standards
• BT committed to NICC/TSG process
• Sourcing standards for consideration from:
- IETF, TISPAN, Metro Ethernet Forum, 3GPP, etc.
• But, localised variants cost time and money
- Balance between backward compatibility
and the burden of forever carrying the past
For discussion purposes.
No implementation assurances
REGULATORY FRAMEWORK
• NGNs Are Driven by Cost Savings
- No one can “build it and they will come” on revenue bet
- Investment requires savings flow back to shareholders
• Regulators face a difficult challenge
-
NGNs are disruptive to traditional boundaries
NGNs challenge past regulatory assumptions
(e.g. thin & disperse vs. fat & fewer interconnect)
• Regulation needs to focus on the future,
not the past
-
UK embarking on a new path forward: equivalence
BT’s FUTURE TECHNICAL ESTATE
21CN SUMMARY
• 21CN is the enabling infrastructure for growth
at BT and for its customers
• The most ambitious business transformation
programme in communications worldwide
• Represents a major investment by BT