The UKLight Network
Dr John S. Graham
ULCC
johng@nosc.ja.net
Bandwidth ‘Channels’
•
•
•
•
•
•
•
Large (1 Gb/s)
Point-to-Point
Connection-Oriented
Layer II switched
Uncontended
Persistent
Established Manually
Components
• Equipment
– SDH & MSPP
– Ethernet switching
• Circuits
– National
– International
• Co-location Facility
Northern
Ireland
NNW
Clydenet
UHI Network
AbMAN
FaTMAN
EaStMAN
C&NL
MAN
Glasgow
North Wales
MAN
Edinburgh
NorMAN
YHMAN
Warrington
Leeds
EMMAN
MidMAN
Reading
London
EastNet
Kentish MAN
TVN
Bristol
South Wales
MAN
SWERN
Portsmouth
LeNSE
LMN
Warrington
Manchester
Cambridge
Reading
St Pancras
ULCC
Chicago
Amsterdam
UCL
Imperial College
GLIF World Satellite Image
GLIF Atlantic Satellite Image
Infrastructure – CoreDirector CI
• Up to 16 x STM-64 or
64 x STM-16
• 160 Gb/s nonblocking switching
capacity
• Groom traffic down to
individual VC-3
Infrastructure – MetroDirector K2
• Gigabit Ethernet:
– 6 physical and 10 PoS ports
– 8.5 G switching capacity
– 2.5 G cross-connect capacity
• Fast Ethernet:
– 24 physical and 4 PoS ports
– 4.9 G switching capacity
– 2.5 G cross-connect capacity
The UKLight-Controlled Layers
7
Application
6
Presentation
5
Session
4
Transport
3
Network
2
Data Link
SONET/SDH
1
Physical
WDM
Path
Fibre
Multiplexer
Regenerator
Physical
SONET/SDH
• SONET
– ANSI Standard
– Deployed in North America
– STS-1 = 51.840 Mb/s
• SDH
– ITU-T Standard
– Deployed throughout rest of world
– STS-3c/VC-4 = 155.52 Mb/s
Time Division Multiplexing (TDM)
• Allows multiple independent logical
circuits to be provisioned over one
physical circuit:
– 4 x VC-4-16c (2.4 Gb/s)
– 16 x VC-4-4c (622 Mb/s)
– 64 x VC-4
(155 Mb/s)
– 192 x VC-3 (51 Mb/s)
VC-4-64c (10 Gb/s)
• Time-slots are pre-allocated to the
channels, rather than arbitrated on a
per-time slot basis.
Transporting Ethernet
• Currently use non-standard contiguous
concatenation VC-4-8C (1244 Mb/s) per
gigE channel.
• Maximum 8 gigE channels per STM-64
• New technology soon:
– GFP-F
– VCAT
– LCAS
• Will allow 9 transatlantic gigE channels!
Bandwidth Categories
Users
ΣC
ΣB
ΣA
ADSL
Bandwidth
gigE
Routing is Not Mandatory!
• High bandwidth circuits are affordable.
• Router linecards are expensive and
becoming more so.
• Optical = 10% Switching = 10% Routing
• High bandwidth, persistent circuits
connecting a few sites require switching
gear.
• Most switching should be Layer I.
How to Connect
• Circuit to UKLight PoP
– UCL
– Imperial College
• Over Routed Development Network
– Manchester (temp)
• Co-Lo at ULCC
Circuits Currently Established
• UCL (HEP)
– to Fermi National Accelarator Laboratory
– to UIC Co-Located Servers @ StarLight
• UCL (Chemistry) to TeraGrid
• Manchester (HEP) to CERN