October 2012 Rob Evans Jeremy Sharp

Janet6 online briefing

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

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

•  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

 

•  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

Infrastructure design

Rob Evans Chief Technical Advisor, Janet

Infrastructure Design: Fibre

Backbone Fibre

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

Backbone and Regional Networks

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

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

Backbone Points of Presence

•  Vacating the Verizon 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)

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

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

Infrastructure Design: Transmission

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

All mirrors and no smoke (unless it breaks)

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

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

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

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

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

IP topology

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

IP topology

Lightpath Topology

Lightpath topology

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!

Questions & Answers

•  Jeremy Shar p •  Rob Evans •  Neil Shewry