Transcript No Slide Title

GSC-8/GTSC-1/GRSC-1
Ottawa, Canada
28 April – 1 May 2003
SOURCE:
TITLE:
AGENDA ITEM:
DOCUMENT FOR:
GSC-8-021
TSACC
Broadband Access: Cutting
through the standards
maze.
7.2
Decision
[DEC]
Discussion
X
Information
1
Broadband Access: Cutting
through the standards maze
Presented by
Keith G Knightson
1
Decision or Action Requested
Promote development of rationalization among Broadband Access
standards, and open access model.
2
References
3
Issues for Discussion
Proposals for rationalization and open access.
2
Abstract:
This contribution will outline the diversity and complexity
of standards associated with the provision of Broadband
Access, using DSL, Cable and Fixed Wireless systems.
Recommendations will be made for the reduction and
rationalization of standards among these systems, together
with the potential use of layer 2 standards for facilitating
access to Internet Service Providers.
3
Standards Issues
Standards Challenges:
•
Multitude of different protocol stack
combinations;
•
Provision of standardized points of
interconnection for open access.
4
Cable Systems Protocol Standards
SNMP
TFTP
DHCP
Security
Management
UDP
IP & ICMP
ARP
Ethernet
IP over Ethernet
Link
security
MAC
Transmission
Convergence
(downstream only)
Physical Media
5
DSL Systems Protocol Standards
PPPoA
IP/Eth
PPPoE IP/AAL5
L2TPoA
IP
PPP
PPP
PPPoA
Ethernet
PPPoE
PPP
Ethernet
L2TP
LLC or VC Mux
AAL5
ATM
DSL
6
Fixed Wireless Broadband Protocol Standards
IP
Convergence
ATM
Convergence
Ethernet
Convergence
MAC
Privacy
Transmission Convergence
802.16 Physical Layer
7
The Maze
•
•
•
Some stacks use Ethernet, some don't,
Some stacks use ATM, some don't,
Some stacks use PPP, some don't.
•
Lack of open Point of Interconnections (POIs) at each
layer, results in bundling of service with transmission.
•
LAN access problems:
• Different LAN Users access to different ISPs.
• ISPs access to specific LAN users.
8
Guidelines for Interconnection Standards
Principle 1
The variation between protocol stacks should be reduced to
a minimum.
Principle 2
The commonality between protocol stacks should be
maximised.
Principle 3
Tunneling should be used “interwork” non-compatible
network segments.
Principle 4
The protocol stack should be consistent with independent
provision of any of peering points at any layer in the
protocol stack.
9
Guidelines for Interconnection Standards (2)
Principle 5
The protocol stack should facilitate the provision of
value-added services.
Principle 6
The protocol stack should facilitate access security.
Principle 7
The protocol stack should facilitate QoS provision
(involving quantifiable and measurable levels of service).
Principle 8
The protocol stack should provide flexibility for mixing
and matching different underlying physical media.
Principle 9
There should be equal access to the point of community
aggregation.
10
Scope for Protocol Stack Rationalization?
Recommendation:
IP
PPP
L2TP
Ethernet
AAL5
Various Physical Media
Simplification and Facilitation of ISP interconnection
11
Recommended Interconnection/Peering Arrangements
ISP
ISPs
L2TP/PPP
Metro ATM
D
S
L
A
M
AAL5 Stack
Users
AAL5 Stack
LMDS
= Potential layer 2 POIs
Ethernet Stack
ISPs
Metro Ethernet
Ethernet Stack
Ethernet
Switch
Local Ethernet
Users
CATV
Middle mile
Last mile
12
Broadband: Equal Access Model
SP1
SP2
SP4
SP3
Access or Backbone
SP5
Access or Backbone
User1
User2
SP = Service Provider
13
Broadband: Bottleneck Access Model
SP3
SP4
SP5
SP6
SP7
Backbone
Backbone
Access
User1
SP1
User2
Access
User3
User4
SP2
User5
User6
14
Broadband Access Issues - 1
•
The separation of service from facilities,
•
Access should permit:
•
•
•
•
Policy recognition of two access frameworks:
•
•
•
independent provision of terminal equipment,
user choice for service provision, and
use of multiple service providers.
Equal Service Access Architecture, and
Bottlenecked Service Access Architecture.
Mass migration from dial-up access can be expected.
15
Broadband Access Issues - 2
•
Standards need to be rationalized among access systems
such as DSL, cable wireless, etc.
•
User lock-in is a common issue, due to proprietary and
bundled systems.
•
No technical reason why all services (voice, data, video)
cannot be supplied over a single physical medium, i.e.
integrated services access.
•
Policy may be key to deployment of integrated services
access and choice/competition.
16
Conclusions
Need for:
•
Rationalization of protocol stacks for Broadband Access.
•
Recognition of unbundled access model(s).
17
Broadband Access:
Cutting through the standards maze
K
K
KGK Enterprises
1806 Lahey Court
Kanata
Ontario, K2W 1B2
Tel: +1 613 839 0404
E-mail: [email protected]
G
18
Peering/Interconnection Models (1)
Network Node
User Node
Network
Layer
Network
Layer
Data Link
Layer
Data Link
Layer
Physical
Layer
Physical
Layer
End-to-End continuity
Continuous physical medium
Network Node
User Node
Network
Layer
Network
Layer
Data Link
Layer
Data Link
Layer
Physical
Layer
Physical
Layer Relay
Physical
Layer
Discontinuous physical media
19
Peering/Interconnection Models (2)
Network Node
User Node
Discontinuous Data Link
Network
Layer
Network
Layer
Data Link
Layer
Data Link
Layer Relay
Data Link
Layer
Physical
Layer
Physical
Layer
Physical
Layer
Discontinuous physical media
Network Node
Discontinuous Network Layer
User Node
Network
Layer
Network
Layer Relay
Network
Layer
Data Link
Layer
Data Link
Layer
Data Link
Layer
Physical
Layer
Physical
Layer
Physical
Layer
Discontinuous physical media
Discontinuous Data Link
20