ALPSTEIN. Building SWITCH s 2 nd optical backbone. Felix Kugler

Transcription

1 ALPSTEIN Building SWITCH s 2 nd optical backbone Felix Kugler felix.kugler@switch.ch CEF Workshop, Prague,

2 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 2

3 ALPSTEIN? AgiLe Photonic Scalable TErabIt Network 3

4 ...and what s that all about? SWITCHlan s heaviest modification since SWITCHlambda ( ) topological extensions and modifications complete rebuild of the optical transport system deployment of first 100G routers 4

5 The ALPSTEIN goals Key characteristics more bandwidth reserves more flexibility more reliability high sustainability how to reach more optical channels higher bitrate per channel tunable components photonic switching sophisticated NMS better geographical coverage additional, geo-diverse physical paths to key sites optical switching at all branching points protection & restoration mechanisms (but beware of excessive complexity!) reasonable economics promising road map vendor stability 5

6 Why a lot more can be done today shrink, shrink! sophisticated modulation formats tunable optics optical switching (ROADMs) ALPSTEIN shall benefit from all these nice things! this absolutely needs two fibers! 6

7 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 7

8 official start of project vendor decision now Project timeline technology survey with selected vendors topology modifications in the core backbone tech specs WTO proc. detailed planning installation & migration operational phase with continuous upgrades t 8

9 Planned SWITCHlan backbone 2015 ~phase 1 3Q2014 phase 2 until mid 2015 some minor topology modifications are likely! 9

10 The ALPSTEIN procurement Project ALPSTEIN SWITCH reserved the right to select a CH supporter of its choice RFQ 100G router platform GATT/WTO RFQ optical transport platform : hardware software vendor services GATT/WTO selection of CH local support as an option of the RFQ alternative ways 10

11 Project timeline, zoomed in footprint extension fiber infrastructure conversion to uni-directional topology optimization design roll-out new optical layer procurement process refined design roll-out test design design roll-out roll-out IP Layer continuous upgrades of production routers procurement process introduction of a new 100G capable router platform official project start vendor decision: ECI, Cisco now 11

12 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 12

13 Footprint extensions 2013 backbone footprint extensions first city rings 13

14 9 fiber modifications for phase 1 fiber swaps and conversion to HWDM 14

15 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 15

16 Roll-out of the new DWDM core Lausanne bypass core backbone extension 1Q

17 ALPSTEIN deployment phase 1 in operation since Sep 11, 2014! 17

18 ALPSTEIN final deployment km of backbone fiber 81 usable lambdas 30 nodes ~ 2.5t of gear 18

19 A new DWDM system: ECI Apollo Apollo: a modern platform (2012) key parameters of our installation: photonic switching at all fiber crossings (any lambda to any exit) no OTN switching; sub-lambda services generated on routers 81/88 lambdas available in our current setup dispersion compensated allows mixed operation of low cost standard 10G waves ( on/off keying ) 100G coherent waves 1000km photonic reach two geo-diverse paths between any core node pair Raman-free design ROADMs 4D and (soon) 8D, flexible grid ready tunable lasers and filter arrays rapid service turn up few spare parts permit flexible path protection or restoration two fiber system tolerant to fiber sharing with off-c-band waves 19

20 Basic DWDM node building block compensation amplification line-side ROADMs inband management to build a pure layer 3 network with routers in all nodes re-use same channels throughout the network to support dynamic photonic services, express channels to distant nodes, future flexgrid services By all means, we tried to avoid 80 lambda OADMs for all degrees in a node that s huge! 20

21 DWDM nodes a typical 3D static node for dynamic nodes add: add/drop ROADM tunable filter arrays for conventional transponders splitters for coherent transponders backdoor access

22 DWDM nodes (2) inline amplification (ILA): no OADMs single amplifiers per direction dynamic nodes come in many different setups collocated: everything in a single room distributed: at least on degree in a different location needs <degree> fiber pairs between locations dual add/drop: redundant build-out of the dynamic add/drop part requires an extra degree 22

23 Backbone link matrix (phase 1) Actually, we build two core backbone networks! static blue network static alien 10G lambdas to next hop routers (unprotected) DWDM optics plugged into routers low cost (no transponders, no tunable lasers) reliable (independent of NMS) goes well with existing router base dynamic red network 10G and 100G waves (protected) use of transponders, white optics towards clients transparent lambdas between any PoP pair flexible (directly reach any node) scalable reliable (restoration, protection) 23

24 10G OOK waves 100G+ coherent waves Channel plan GHz spacing today, ready for superchannels reflects the two networks we build blue network uses same lambdas throughout the net (mostly ch57) red network: balance between OOK and coherent lambdas will shift over time amber network: reserved for distance-limited dynamic channels, permits re-use of lambdas [only rough ideas] rest of channels dedicated to dynamic lambdas small guard band between OOK and coherent lambdas nm nm nm 60 8 channels reserved for future city & regional networks 4 channels reserved for aliens to next hop routers 24

25 About colored plugins most alien channels are lit by plugins in our routers Xenpak and X2 were dominant on our favorite router platform unpleasant availability and pricing of plugins we try to avoid buying them since many years! use of SFP+ & suitable adapters instead! colored SFP+ plugins will have a long life conservation of value! programmable to fit host platform weired problem with adapters now solved: compatibility, bit errors SFP+ performance is not (yet?) 100% up to Xenpak/X2 levels lower sensitivity smaller dispersion tolerance 25

26 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 26

27 Beyond the core saving fiber lease cost is the goal more than ever! share fibers between core backbone and access links share with suitable partners (e.g. mutual backup paths) up to now... after migration small sites daisy chained on their own dedicated single fiber backbone and regional network are fully isolated this setup will be quite incompatible with modern DWDM systems DWDM (extended C-band) and other optical systems (O/S/L-bands) share a fiber pair passive optical junctions separate the services restricted by max span attenuation careful power management needed to avoid interference 27

28 HMUX splitters two year evolution from a cascade of CWDM OADMs to a sophisticated optical filter with 4 windows 3 rd generation of HMUX -splitters is now widely deployed precise cut-over frequencies very low loss short local LR links regional links CWDM DWDM + OSC currently unused compatible with operational C-band DWDM system incl. OSC half of the standard CWDM colors long-range optics LR4 & LR10 28

29 HMUX splitter performance production seems tricky, so careful selection of the best pieces we suspect high reject rate measurements: C-band attenuation <0.9dB neighbor channel suppression >25dB cutoff frequency variation <3nm overlay of S- and C-band port attenuation 29

30 HMUX splitter mechanics two optical modules fit into one metal tray 1HE rack mount carrier holding 3 front loadable trays, each with 2x HMUX 4-window splitter or any combination of CWDM filters 30

31 HWDM operation about 20 HMUX installations up to now careful documentation is paramount! separate maps for non-dwdm optical layer in addition to DWDM system s docs minimize interference! HMUX filters are not perfect about >23dB of isolation; crosstalk adds to noise level non-linear effects (Raman effect) if power levels get high? we keep O/S-band signals as low as possible (tx-side attenuators) 31

32 HWDM use cases backup network access avoid single point of failure avoid full blown 2 nd PoP tradeoff: HWDM allows emergency 10G connectivity at a low price point 2 backup paths for partner networks provides transparent optical channels outside C-Band SpaaS? high isolation coexist with SWITCH backup paths requires agreement on power levels 3 access to small sites along backbone drastically reduces cost only little extra fiber to be leased low cost optics will do 32

33 A more complete view on the backbone 33

34 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 34

35 Phase 1 deployment schedule BS X X BE EZ LS FR AG CE EL GE RF MY SI VS LO LG XX Sorrento or BTI DWDM node XX next generation DWDM node 35

36 Installation ECI DE: collect gear from various sources and pack per installation site shipment from ECI DE to our partner Deltanet : assembly of chassis basic configuration of node controllers fitting of power cables results in a substantially reduced transport volume reduces installation time on site! installation on site ( days/site) mount all chassis connect & configure power feeds carefully plug the fiber patches Ethernet connectivity for ECI chassis & rectifiers integrate local chassis into NMS beautify cabling 36

37 Migration 2..3 hops per day ECI + SWITCH staff at all nodes Apollo setup procedure systematically check optical paths from transponders towards exits compare to simulation debug if necessary fine tune certain critical power levels within the node measure in-band OSNR values for future reference bring up optical services SWITCH staff to monitor network performance, make sure there is no impact on our users connect Apollo client ports to routers, bring up services short function test on site in some cases, considerable reconfiguration work is required simultaneously 37

38 Agenda ALPSTEIN intro The project plan Fiber footprint The new optical core Beyond the core Roll-out Closing 38

39 Recalling some key points SWITCH s innovation cycle driven by need, not funding periods the intension is to live with the new DWDM system a long time with upgrades and new forthcoming vendor components with appropriate optical add-ons from other sources ( multi-vendor ) design & roll-out gradually, not by fork-lift very closely assisted by SWITCH staff build know-how about the new system continuously adjust the design to the latest requirements hot migration without new fibers while clients stay connected acquisition of a few new permanent fiber links instead of tons of temporary ones these backbone extensions facilitated the migration process as well migration still rather tricky! fiber sharing to save lease cost to foster cooperation with our regional partner networks 39

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