the uklight network dr john s. graham ulcc
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The UKLight Network
Dr John S. GrahamULCC
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
North WalesMAN
LeNSESWERN
Kentish MAN
NorMAN
YHMAN
EMMAN
EastNet
LMN
South WalesMAN
TVN
MidMAN
NorthernIreland
NNW C&NLMAN
Glasgow Edinburgh
Warrington Leeds
Reading London
Bristol Portsmouth
EaStMAN
UHI NetworkClydenet AbMAN
FaTMAN
Reading
WarringtonManchester
Cambridge
St Pancras
Imperial CollegeUCL
AmsterdamChicago
ULCC
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 non-blocking 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
PhysicalData LinkNetwork
TransportSession
PresentationApplication
PhysicalRegeneratorMultiplexer
Path
FibreWDM
SONET/SDH1234567
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
• 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)
• Time-slots are pre-allocated to the channels, rather than arbitrated on a per-time slot basis.
Time Division Multiplexing (TDM)
VC-4-64c (10 Gb/s)
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
Bandwidth
User
s
gigEADSL
ΣA
ΣC
ΣB
Bandwidth
User
s
gigEADSL
ΣA
ΣC
ΣB
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
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