A presentation from the second of a number of online events relating to Janet6.

1. October 2012
Rob Evans
Jeremy Sharp
Janet6 online briefing

2. 1. Procurement and project update
Jeremy Sharp
Head of Strategic Technologies, Janet
2. Infrastructure design
Rob Evans
Chief Technical Advisor, Janet
3. Questions and Answers
Jeremy Sharp & Rob Evans will be joined by Neil Shewry, Janet6
Project Manager
Janet6 update:Topics

3. Summary to date
• Janet6: Project to replace
the UK wide Janet
backbone, SuperJanet5
Requirements gathering & analysis 2011
Procurement
• Fibre infrastructure
• Optical transmission equipment
Oct 2011 to Sept
2012
Rollout Sept 2012 to April
2013
Transition SJ5 to J6 May 2013 to July
2013
SJ5 ‘turned-off’ Oct 2013
SuperJanet5: 2006 to 2013

4. • Fibre infrastructure contract signed: 31st July 2012
• Scottish & Southern Energy Telecoms (SSET)
• 10 year contract
• £30M
• Optical transmission contract signed: 6th September 2012
• Ciena Inc.
• Supply and 5 years support agreement
• £12.8M
Janet6 status – Procurement phase complete

5.
• To deliver a highly reliable and secure network
– Careful design choices
– Carrier class network equipment & infrastructure
– Strict SLA’s
– Management by Janet NOC
• To provide a network that is flexible in meeting future
demand
– Design enable capacity scaling at controllable cost
• To provide a network that is more agile in dealing with
change
– Management by Janet NOC
– Close working relationship with industry partners
Meeting your requirements

6. Infrastructure design
Rob Evans
Chief Technical Advisor, Janet

7. Infrastructure Design: Fibre

8. Backbone Fibre

9. Backbone Fibre
• New East-West link between Erdington (Birmingham) and
Lowdham (Leicester)
– More resilience
– Shorter reroutes in case of failure
• Different topology in the south
– Single loop of fibre through London and Bristol

10. Backbone and Regional Networks

11. Backbone and Regional Fibre
• Same principle of two diverse fibre pairs to each region.
• Fewer collector arcs picking up multiple regions
• All fibre is G.652
– Older specification than G.655, but works better with modern
transmission systems

12. I could go into more detail…
…but how good is your
eyesight?
• >5,700km fibre
• 78 PoPs with optical
equipment
• 232km unamplified
subsea span
• 119km unamplified land
span
• 28 100GE circuits
• 130 10GE circuits

13. Backbone Points of Presence
• Vacating theVerizon Business PoPs
– Except for small presence in Glasgow and Reading due to Scottish
Schools’ network and TVN
• Existing Provider-Neutral PoPs
– Telehouse North
– Telecity Harbour Exchange
– Telecity Manchester
• Moves onto the backbone
– Scolocate
• Moves onto the fibre backbone (more later)
• New Provider-Neutral PoPs
– Telecity Powergate (West London)
– Telehouse West
– Leeds (AQL, Salem Church)

14. Other Points of Presence
• Transmission PoPs
– Couple of racks, multiplex wavelengths from regional fibres onto the
backbone
– Provided by SSET
• In-Line Amplifier PoPs
– Single rack, small amplifier shelf
– Provided by SSET

15. PoP Issues
• Power – we need lots of it
– Routers have two Power Entry Modules (PEMs)
– Each PEM requires six -48V DC feeds with 60A breakers
– 2-4kW more for the transmission equipment
– Lightpath routers, management routers and switches
– Electrical guys don’t seem to like aggregating capacity as easily as
router guys

16. Infrastructure Design:Transmission

17. Ciena 6500
• ROADM
– Reconfigurable Optical Add/Drop
Multiplexer
• Wavelength Selective Switch
– Microelectromechanical System
(MEMS)
• Diffraction grating
• Lens
• Servo-actuated mirrors
– 2:1 or 9:1 modules allow
incoming DWDM channels to be
split over 2 or 9 outgoing fibres

18. All mirrors and no smoke (unless it breaks)

19. Other components…
• Transponder
– Takes 100GE from router and converts it to DWDM 100Gbit/s signal
• Muxponder
– Carries, e.g., multiple 10GE circuits on 40 or 100Gbit/s signal
• Line-side card
– Dual polarisation quadrature phase shift keying
– >100Gbit/s (including framing) within 50GHz of optical spectrum

20. Transmission Design: Dispersion Compensation
• Dispersion Compensation or not?
– Uses ‘doped’ fibre to compensate for chromatic dispersion
– Used on SJ5 and most existing DWDM networks
• ‘Coherent’ receivers for higher-speed circuits are adversely
affected by the presence of dispersion compensation
• Omit dispersion compensation and it is hard to carry lower
speed signals
– Limited reach
– Guard bands

21. Transmission Design: Dispersion Compensation
• Chose to drop dispersion compensation
– No native 10GE transmission
– All 10GE circuits are carried over 40Gbit/s or 100Gbit/s carriers
– Very few parts of the network where we needed just one or two
10GE circuits
– Maximises reach of 40Gbit/s and 100Gbit/s circuits

22. Transmission Design: OTN Switching
• A bit like SDH (or ATM?)…
– Build optical capacity between nodes
– Put lower-speed circuits into OTN containers
– Switch them between points on the network
• Discussed during competitive dialogue
– Not available from a wide range of shortlisted suppliers
– Expensive
– Difficult to see the use when we also have the Janet Lightpath
(EoMPLS) layer

23. Transmission Design:‘Thin’ optical layer
• Existing transmission systems convert optical signal received
from router to electrical, then reconvert it to optical again to
transmit.
– Each circuit needs four “client side” optics (XFPs, CFPs), plus the
transmission-side lasers
• If router could transmit long-haul signal directly, transmission
equipment just needs to balance levels and multiplex.
– Should be cheaper
– Move framing, FEC (error correction) and encoding to router
interfaces
• Starting to arrive for 10G
• Not there for 100G

24. IP topology

25. IP topology
• Remember that change in PoPs?
– Moving routers from PoP to PoP whilst still maintaining a service
would have been … challenging.
– One-night migration for all of Janet?
• Need to upgrade from Juniper T-1600 to T-4000
– Higher port density
• 2x100GE per slot
• 24x10GE per slot
– Significantly lower per-port 100GE price
• New chassis and hand old ones back after migration
– Except ‘fixed’ PoPs (Telecities,Telehouses)
• IP, IPv6, Unicast, Multicast
• Looking at L2VPNs

26. IP topology

27. Lightpath Topology

28. Lightpath topology

29. Lightpath changes
• Increase the bandwidth between the backbone nodes to
100GE
– If client optics are in place, allows us to carry 10GE lightpath circuits
with only software configuration on the core.
• Topology reflects what is currently required
– If there is a need for lightpaths elsewhere, talk to us!

30. Questions & Answers
• Jeremy Sharp
• Rob Evans
• Neil Shewry