I E C TR 62 343 -6-1 ® Edition 201 7-03 TE CH N I CAL R E POR T colour i n si de D yn am i c m o d u l es – Part 6-1 : Desi g n g u i d e – I n term ed i ate trol l er for m u l ti pl e d yn am i c m o d u l e IEC TR 62343-6-1 0:201 7-03(en) s ystem s TH I S P U B L I C AT I O N I S C O P Y R I G H T P R O T E C T E D C o p yri g h t © I E C , G e n e v a , Sw i t z e rl a n d All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information IEC Central Office 3, rue de Varembé CH-1 21 Geneva 20 Switzerland Tel.: +41 22 91 02 1 Fax: +41 22 91 03 00 info@iec.ch www.iec.ch Ab o u t th e I E C The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies Ab o u t I E C p u b l i ca t i o n s The technical content of IEC publications is kept under constant review by the IEC Please make sure that you have the latest edition, a corrigenda or an amendment might have been published I E C Catal o g u e - websto re i ec ch /catal o g u e The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents Available for PC, Mac OS, Android Tablets and iPad I E C pu bl i cati on s search - www i ec ch /search pu b The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee,…) It also gives information on projects, replaced and withdrawn publications E l ectroped i a - www el ectro ped i a o rg The world's leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and French, with equivalent terms in additional languages Also known as the International Electrotechnical Vocabulary (IEV) online I E C G l o ssary - std i ec ch /g l o ssary 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002 Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR I E C J u st Pu bl i sh ed - websto re i ec ch /j u stpu bl i sh ed Stay up to date on all new IEC publications Just Published details all new publications released Available online and also once a month by email I E C Cu stom er Servi ce Cen tre - websto re i ec ch /csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csc@iec.ch I E C TR 62 343 -6-1 ® Edition 201 7-03 TE CH N I CAL R E POR T colour i n si de D yn am i c m o d u l es – Part 6-1 0: Desi g n g u i d e – I n term ed i ate trol l er for m u l ti pl e d yn am i c m o d u l e s ystem s INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.1 80.01 , 33.1 80.99 ISBN 978-2-8322-41 27-1 Warn i n g ! M ake su re th a t yo u o btai n ed th i s pu bl i c ati o n fro m an au th ori zed d i stri bu to r ® Registered trademark of the International Electrotechnical Commission –2– I EC 62343-6-1 0:201 © I EC 201 CONTENTS FOREWORD I NTRODUCTI ON Scope N orm ati ve references Term s, defi n iti ons and abbrevi ated term s Term s and defi n i ti ons Abbreviated term s Backgroun d of th e software defi ned n etworkin g an d i ts trol pl an e for optical nodes Research acti viti es on h ig h-perform ance n ode system s where i n term edi ate trol ler plays key rol e Photon ic n etwork wi th OpenFlow® controll er D yn am ic optical path n etwork wi th a network controll er Control i nterface of th e Photon ic Layer-2 I n term ediate troll er for m ulti ple d yn am ic m odu l e system s Descri pti on of th e trol l er Control ler of m ul ti pl e d yn am ic m odul es for a n etwork n ode Structu re of th e in term edi ate control ler Fu ncti ons Shared inform ation between the trol in terface an d the network control plan e 1 Exam ple of m u lti-deg ree ROADM system s Conclu si on Bibl i ograph y Fig u re – Conceptu al block of th e control i nterface for m u lti ple d yn am ic m odu l es an d network devices Fig u re – Basic block of th e control i nterface for m ultiple d yn am ic m odu l es Fig u re – Difference between n ecti on i nform ati on an d confi gurati on i nform ation Fig u re – Fu nction coverag e of th e i n term ediate trol ler 1 Fig u re – Exam pl e of a m ultipl e d yn am ic m odu l e system Fig u re – Exam pl e of 4-deg ree ROADM n ode arch itecture Fig u re – 3-degree ROADM n ode wi th colourl ess, non -direction al add/drop ports Fig u re – Com pact PLC-based transpon der agg reg ator for col ourl ess and direction l ess ROADM Tabl e – Shared i nform ati on i n th e in term edi ate troll er I EC 62343-6-1 0:201 © I EC 201 –3– I NTERNATI ON AL ELECTROTECH NI CAL COMMI SSI ON DYNAMIC MODULES – Part 6-1 0: Design guide – Intermediate controller for multiple dynamic module systems FOREWORD ) Th e I n ternati on al El ectrotechn i cal Com m i ssi on (I EC) i s a worl d wi d e org an i zati on for stan dardi zati on com pri si n g al l n ati on al el ectrotech ni cal com m i ttees (I EC N ati onal Com m i ttees) The obj ect of I EC i s to prom ote i n ternati on al co-operati on on al l questi on s concern i n g stand ardi zati on i n th e el ectri cal an d el ectroni c fi el ds To thi s end and i n addi ti on to other acti vi ti es, I EC pu bl i sh es I n ternati on al Stan dards, Tech n i cal Speci fi cati ons, Tech ni cal Reports, Pu bl i cl y Avai l abl e Speci fi cati ons (PAS) an d G ui des (hereafter referred to as "I EC Publ i cati on (s) ") Th ei r preparati on i s entrusted to techn i cal com m i ttees; any I EC Nati on al Com m i ttee i nterested i n th e su bj ect deal t wi th m ay parti ci pate i n th i s preparatory work I nternati on al , g overn m ental an d n on g overn m ental org an i zati ons l i si n g wi th th e I EC al so parti ci pate i n th i s preparati on I E C col l aborates cl osel y wi th th e I n tern ati onal Org an i zati on for Stan d ardi zati on (I SO) i n accordan ce wi th di ti on s determ i ned by ag reem en t between th e two org an i zati on s 2) Th e form al deci si on s or ag reem en ts of I EC on tech ni cal m atters express, as n earl y as possi bl e, an i ntern ati onal sen su s of opi ni on on th e rel evant su bj ects si n ce each tech ni cal com m i ttee h as representati on from al l i n terested I EC N ati on al Com m ittees 3) I EC Pu bl i cati ons h ave th e form of recom m endati on s for i n tern ati onal use an d are accepted by I EC N ati onal Com m i ttees i n th at sense Whi l e al l reasonabl e efforts are m ade to ensure th at th e tech n i cal content of I EC Publ i cati on s i s accu rate, I EC can n ot be h el d respon si bl e for th e way i n wh i ch th ey are used or for an y m i si nterpretati on by an y en d u ser 4) I n order to prom ote i n tern ati onal u ni form i ty, I EC N ati on al Com m i ttees un d ertake to appl y I EC Pu bl i cati on s transparentl y to the m axi m um extent possi bl e i n th ei r nati on al an d reg i on al publ i cati ons An y d i verg ence between an y I EC Pu bl i cati on an d the correspon di ng nati on al or reg i on al pu bl i cati on sh al l be cl earl y i n di cated i n the l atter 5) I EC i tsel f d oes n ot provi de an y attestati on of form i ty I n depen den t certi fi cati on bodi es provi de conform i ty assessm ent servi ces and, i n som e areas, access to I EC m arks of form i ty I EC i s not respon si bl e for an y servi ces carri ed out by i nd epen den t certi fi cati on bodi es 6) Al l u sers shou l d en su re th at th ey h ave the l atest edi ti on of thi s publ i cati on 7) N o l i abi l i ty shal l attach to I EC or i ts di rectors, em pl oyees, servants or ag ents i ncl u di n g i n di vi du al experts an d m em bers of i ts tech ni cal com m i ttees and I EC N ati on al Com m i ttees for any person al i n j u ry, property d am ag e or oth er dam ag e of any n ature wh atsoever, wh eth er di rect or i ndi rect, or for costs (i n cl u d i n g l eg al fees) and expen ses ari si n g out of the pu bl i cati on, u se of, or rel i an ce u pon , th i s I EC P ubl i cati on or any oth er I EC Publ i cati on s 8) Atten ti on i s drawn to th e N orm ati ve referen ces ci ted i n th i s pu bl i cati on U se of th e referenced publ i cati on s i s i n di spen sabl e for th e correct appl i cati on of thi s publ i cati on 9) Atten ti on i s drawn to th e possi bi l i ty th at som e of th e el em en ts of th i s I EC Publ i cati on m ay be th e su bj ect of patent ri g hts I EC shal l n ot be hel d respon si bl e for i den ti fyi ng an y or al l su ch paten t ri g hts The m n task of I EC techn ical com m ittees is to prepare I n tern ation al Stan dards H owever, a tech nical com m ittee m ay propose the pu bl ication of a techn ical report wh en i t h as coll ected data of a different ki nd from th at wh ich is norm all y pu blish ed as an I ntern ati onal Standard, for exam ple "state of th e art" I EC TR 62343-6-1 0, wh i ch is a tech n ical report, h as been prepared by subcom m ittee 86C: Fi bre optic system s an d acti ve devices, of I EC techn ical com m ittee TC 86: Fibre optics The text of th is tech n ical report is based on the fol l owing docu m ents: Enqui ry draft Report on voti n g 86C/1 381 /DTR 86C/1 422/RVC –4– I EC 62343-6-1 0:201 © I EC 201 Fu ll inform ati on on the voti ng for the approval of th is tech nical report can be fou n d in th e report on voti ng in dicated i n the above table This docum en t h as been drafted i n accordance wi th th e I SO/I EC Directi ves, Part A list of al l parts i n th e I EC 62343 seri es, pu bl ish ed un der th e g eneral titl e can be fou n d on th e I EC website Dynamic modules, The com m ittee h as deci ded that th e ten ts of th is docum en t wil l rem n u nch ang ed un til the stabili ty date i ndicated on th e I EC websi te un der "http://webstore iec ch " i n th e data rel ated to th e specific docum ent At th is date, the docu m en t wi l l be • reconfirm ed, • wi thdrawn , • repl aced by a revised edi ti on, or • am ended A bi l in g ual versi on of th is pu blicati on m ay be issu ed at a later date IMPORTANT – The 'colour inside' logo on the cover pag e of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents Users should therefore print this document using a colour printer I EC 62343-6-1 0:201 © I EC 201 –5– I NTRODUCTI ON Software defin ed n etworking (SDN ) techn olog y i s widel y recog n i zed as a prom isin g sol ution for flexibl e an d efficien t provision i ng of networks by vi rtu alizi n g their infrastructures, wh ich resu l ts i n cost-effecti ve reali zati on of h ig h capacity, l ow energ y consum ption an d even low latency SDN techn ol og y wi l l rem ain h i g hl y i nfl u en ti al over g l obal i ndustries, societies, an d th e en vironm ent for m an y years to com e Optical fibre com m un ication tech nol og y h as offered sufficient transport capacity wi th a fixed ph ysical topol og y H owever, recen t tech n olog ical prog ress i n optical networki ng enables ph ysical reconfig u rati on of optical paths by troll i n g m ul tipl e d yn am ic m odu les such as wavelen gth divisi on m u lti plexi ng (WDM) devices an d swi tch in g devices Here, th e key is to have an in term ediate control ler that controls an d m ain tai ns th e m u ltiple dyn am ic m odu l es in an in teg rated fash i on , accordin g to th e u pper l ayer control l er of th e SDN I n order to realize such a reconfig urabl e an d/or d yn am ical l y switch abl e optical n etwork infrastructures at a h ardware level in a cost-effecti ve, reliabl e, scal abl e an d low-carbon m anner, it is im portan t to in i ti ate, in a tim el y m ann er and to a wide extent, conceptual and tech nical discussi ons, particu larl y on th e interm ediate control ler for fu ture stan dardi zati on It is very im portan t for i ndustries to identify requ irem ents for network arch itecture an d devices/com pon en ts i n a tim el y m ann er, and to im prove th e tech n ol og y devel opm ent an d in vestm ent effici enci es The obj ective of th is part of I EC 62343 is to tribu te to th e standardi zation of basic requ irem ents of the d yn am ic optical path networks usi ng th e i nterm edi ate trol ler –6– I EC 62343-6-1 0:201 © I EC 201 DYNAMIC MODULES – Part 6-1 0: Design guide – Intermediate controller for multiple dynamic module systems Scope This part of I EC 62343, wh ich is a Tech n ical Report, discu sses th e ration al e, conceptu al defin i tion, an d m in im um list of functions for an i nterm ediate trol ler th at del ivers a d yn am ic trol sig n al to m ul ti pl e d yn am ic m odu l es These m odu les are inclu ded in an optical-swi tchbased n etwork node, accordi n g to th e u pper layer troller of software-defi n ed optical networki ng Normative references There are n o n orm ati ve references i n th is docum ent Terms, definitions and abbreviated terms 3.1 Terms and definitions No term s and defi n iti ons are l isted i n th is docum ent I SO an d I EC m n tain term in olog ical databases for use in stan dardi zati on at th e fol l owing addresses: • I EC Electropedi a: avai labl e at h ttp://www el ectropedia org / • I SO On l in e browsin g platform : avai l abl e at http://www iso org /obp 3.2 Abbreviated terms AWG C/D/C-ROADM I/F IP m I /F MCOS OCM ODU OXC PLC ROADM Rx SDN TPA Tx Tx/Rx arrayed waveg ui de gratin g colourl ess/direction l ess/con ten tion less reconfi g u rabl e m ultipl exin g i nterface i ntern et protocol m odu le side i n terface m ulticast optical swi tch optical ch ann el m oni tor optical data u n it optical cross n ect plan ar l i gh twave circu it reconfi g urable optical add-drop m u ltiplexing receiver software defin ed n etworki ng transpon der ag greg ator transm itter transcei ver optical add-drop I EC 62343-6-1 0:201 © I EC 201 WDM WSS WXC –7– wavelen gth di vision m u ltiplexi ng wavelen gth selective switch wavelen gth cross nect Background of the software defined networking and its control plane for optical nodes Optical n etworks are evol vi n g from static li nk services to flexi ble l ink services to provide future d yn am ic transport services Software defin ed networki ng (SDN ) is on e of th e n etwork arch itectures th at en able fl exible and d yn am ic n etwork control Th e basic idea of SDN is to separate th e control pl an e from the data pl an e, al l owin g consol idati on of hardware infrastructure to save th e overh ead associated with per-service deploym en t of a cl osed set of resources su ch as com pu tation, storag e, and n etwork For opticall y switched n etworks such as col ourl ess/direction l ess/conten tion l ess reconfi gu rable optical add-drop m ul tipl exin g (C/D/C-ROADM) based m esh n etworks to be d yn am icall y controlled throu gh SDN , th e control schem e sh oul d be desi gn ed to be as sim ple as possi ble, as they associate wi th com pl ex config urati ons of m ul tipl e d yn am ic m odul es I n particu lar, com m on trol i n terface is a key for reali zi n g the control pl an e for such an opti call y swi tch ed n ode; th u s, these in terfaces shou l d be properl y defi n ed from not on l y th e software, bu t also th e h ardware aspect Su ch an interface en ables qu ick n etwork bu i l din g wi th ou t h ardware restricti ons Research activities on high-performance node systems where intermediate controller plays key role 5.1 Photonic network with OpenFlow® controller There are several kin ds of h i gh-perform ance n ode system s for recen t h i gh-speed com m unicati on system s, such as th e in tern et protocol (I P) rou ter in th e field of data com m u nicati on an d th e reconfig urabl e optical add-drop m u lti plexi ng (ROADM) system i n transport system s A h ig h-perform ance n ode system itself is su pported on an ag il e control basis OpenFlow® is the first standard com m unication in terface defin ed between th e trol l in g an d forwardin g plane of an SDN arch itecture Th e OpenFl ow® trol ler is a well org an i zed n etwork control m eth od th at enabl es th e real ization of flexi bl e n etwork control The OpenFl ow® trol ler, wh ich h an dl es th e OpenFlow® protocol , was in itiated by the Open Networking Fou ndation that grew ou t of work at Stanford U n i versity Several ven dors are alread y supporti ng Open Fl ow® to be featu red i n m u lti-ven dor in teroperabi lity, scalabi li ty and support of diverse en vironm ents As a resu l t, network users can m ake an i ndepen dent control en vironm ent from n etwork confi g u rations The techn ical docum en ts are alread y avai lable for practical use [1 ] 5.2 Dynamic optical path network with a network controller D yn am ic optical path switch ing system s can provi de an end-to-en d conn ecti on i n a n etwork with h u ge-capaci ty l i nks I n a network configu ration havi n g optical switches m u tu all y n ected in a m esh config urati on in a transport n etwork, the optical li nk services are d yn am ical l y provision ed i n an end-to-en d m ann er I n th is case, en erg y sum pti on wou ld be m uch sm all er com pared to h i gh -en d rou ter ch ains Th e N ati onal I nsti tu te of Advanced I n dustri al Sci ence and Techn ol og y (AI ST) proposes to call such networks d yn am ic optical path n etworks [2] Of course, th is system requ ires an addi tion al control plan e n etwork; th erefore, th e n ecessary com m unicati on capacity for the control pl ane network is prepared I n th is n etwork, d ynam ic m odu l es in system s can be troll ed by a si ng le network control ler havi n g a j oin t control interface to th e control pl an e Th is si ng l e l ink on th e trol pl an e needs to be well-org an ized _ OpenFl ow® i s th e trad em ark of a product su ppl i ed by Open Networki n g Fou n dati on Thi s i nform ati on i s g i ven for th e ven i en ce of users of thi s docum en t an d d oes n ot sti tu te an en dorsem ent by I EC of th e produ ct n am ed Equi val ent produ cts m ay be u sed i f they can be shown to l ead to the sam e resu l ts N u m bers i n sq uare brackets refer to the Bi bl i og raph y –8– 5.3 I EC 62343-6-1 0:201 © I EC 201 Control interface of the Photonic Layer-2 Future ph oton ic n odes th at i ncorporate tech nol ogi es such as dig i tal coh erent optical transcei vers and flexible-grid WDM can create optical paths wi th arbi trary ban dwi dths over a larg e d yn am ic ran ge of arou nd 30 dB, rang in g from G bit/s to Tbit/s This can en able th e flexible an d efficient u ti li zation of fibre capacity i n the sm art ph oton ic cloud For effici en tl y trol l in g th e h ypoth etical network and syn th etic of each ph oton ic node, com m on in terface of th e n ode sh ou l d be prepared The Task Force Grou p of th e Photon ic I nternet Forum is alread y prom oti ng flexi bl e trol sch em es for optical n etwork nodes [3] This forum tri es to increase th e n um ber of the h ypoth etical n etwork l ayer an d exten d the d yn am ic ran g e of slice capacity, owi n g to th e flexi bl e spectral arrang em ent an d su b-waveleng th path Intermediate controller for multiple dynamic module systems 6.1 6.1 Description of the controller Controller of multiple dynamic modules for a network node For confi guri n g a si n g le network n ode as a hi g h-perform ance n ode system , the control part shou ld be a sing l e i nterface to the network control plan e The control i n terface is a n etwork trol l er that u nifies m u ltiple d yn am ic m odu les wi th various h ardware/software com pon en ts to m ake it behave as a si ng l e network n ode Th is concept h el ps i n bu i l din g u p th e optical network system in a way th at sim plifies th e en tire hardware config urati on Fig u re sh ows a conceptu al block of th e trol i nterface for m u lti ple d yn am ic m odu les an d n etwork devices From a network confi gurati on poi nt of view, three l ayers (th e appl ication l ayer, control layer, an d i nfrastructure layer) work as a coordi nated network A l arg e am ou nt of com m unicati on equ i pm ent, such as opti cal transport system s, is distri bu ted i n th e infrastructu re l ayer, an d system confi g urati on in th e infrastructure layer has an im pact on the adjacent layer Th e interm ediate control ler h as th e role of wrappi ng u p several network devices an d d yn am ic m odu les i n the system Thus, th e interm edi ate control ler provides a sim plifi ed com m u nication en vironm ent to the system , and i t can be a wrap-u p control port of th e h ig h-perform ance n ode system IEC Figure – Conceptual block of the control interface for multiple dynamic modules and network devices Optical com m unicati on system s, such as h ig h-perform ance n ode system s, em ploy a vari ety of m odu les an d com pon en ts An interm ediate controll er is requ ired i n the system for control l in g th e entire set of com ponen ts Th e controller sh ou ld work as a sin g le trol in terface to vey control sig n als to m u ltiple d yn am ic m odu l es, su ch as OXC, WSS, an d WXC, because a si n g le resou rce m an agem en t system sen ds out th e n etwork config u ration order to the I EC 62343-6-1 0:201 © I EC 201 –9– system Th erefore, the system sh ould h ave a proper reception bl ock of th e control si g nal of th e d yn am ic m odu les, wh ich is th e role of th e in term ediate trol ler Typical l y, th e control ler has several fu ncti ons in a system For a h i g h-perform ance node system i n a transport system , th e i nterm edi ate control lers control the followin g dyn am ic m odu l es i n th e system : – – – – – OXC (optical cross conn ect) ; WSS (waveleng th sel ecti ve swi tch ) ; WXC (wavelen gth cross n ect) ; MCOS (m ul ticast optical swi tch) ; OCM (optical ch ann el m on itor) These m odu l es also h ave som e specific i nterfaces, an d th eir specificati ons are avail able in IEC stan dard docum en ts 6.1 Structure of the intermediate controller The in term ediate troll er is located between m u ltiple d yn am ic m odu l es and specific n etwork services i n th e control l ayer for m ulti ple d yn am i c m odu les and n etwork devices Fi g ure shows th e structure of th e trol interface I t sists of a control side i nterface (I /F) for the network control plan e, m odu le side I /Fs (m I /Fs) for various d yn am ic optical m odul es, an d a prog ram m able block th at h as reconfi g urabl e l ogic fu nctions as a hardware abstraction layer The trol side I /F can be a si n gl e in terface to the n etwork control plane Th e l ogical and ph ysical defin itions of I /Fs are consistent wi th the on-g oi ng stan dardi zati on of the n etwork trol pl ane for SDN an d d yn am ic optical path n etwork Th is control i nterface provides wrapup functi ons for m u ltiple d yn am ic m odu le system s, an d several types of d ynam ic m odu l es of m ulti-layer an d m u lti-level system s are trol l ed un iform l y from th e n etwork control plan e IEC Figure – Basic block of the control interface for multiple dynamic modules The trol side i nterface is a gateway port to the n etwork trol plane, an d i t works as a com m and sen der/receiver to th e control plane Several ph ysical layers can be set to th is port such as Eth er port, a n etwork in terface card, and a transceiver for the trol plan e The program m abl e bl ock is located between th e trol-si de I /F an d th e m odu le side I /F I t is also known as a h ardware abstracti on layer I t i nterprets trol com m ands from th e network trol pl an e to the d yn am ic optical m odu l es, an d th e block refers to th e i nform ation shared wi th the network trol plan e and th e d yn am ic optical m odu l es I t has a m em ory an d look-up table as prog ram m ed resources Mon itored inform ation of th e m odu les i s also available for sharin g throu g h th e in terface to th e control pl ane Th is prog ram m abl e block provides th e functi on of wrappi ng m u lti ple optical m odu les usin g h ardware resou rce i nform ati on This block needs to store th e fol lowi ng inform ati on: – 10 – I EC 62343-6-1 0:201 © I EC 201 a) config urati on i nform ation: – constrai n t i nform ation (n etl ist) ; – com m and inform ati on (interpreter) ; – i ntern al l ink inform ation (l ook-u p table between control si de I /F an d m odu le side I /F) b) n ecti on inform ation; c) m onitori ng inform ation Confi g uration inform ation an d nection i nform ati on are n ecessary for the trol si de I /F However, th ese two aspects are com pl etel y different trol targets from th e system viewpoint, an d th is difference sh ou ld be wel l-org ani zed Fi gu re shows th e difference between the n ecti on inform ati on an d the config urati on i nform ation based on typical optical fibre n ecti on for ROADM These aspects are described in fu rth er detail in IEC Figure – Difference between connection information and configuration information The m odu l e-si de I /Fs are specifi ed as conn ecti on in terfaces to the devices, especiall y for dyn am ic optical m odu l es with proper device dri vers I n essence, the d yn am ic optical m odu les are optical com pon en ts provi di ng th e optical path-swi tch i n g function Exam pl e m odu l es are OXC, WSS, WXC, transpon der wi th wavelen gth-tu n eable fu nctions, optical data un i t (ODU ) , an d m on itor m odules such as OCM Standardized d yn am ic optical m odu les i n I EC en able the use of l og ical an d ph ysical defin itions of m odu le si de I /Fs 6.2 Functions In term s of function categ ori zati on , th e i nterm ediate trol ler for m ul ti ple d yn am ic m odu l e system s h as three im portan t functions: wrappin g , m n ten ance, an d com m unication Paragraph describes each function in the en tire n ode system in detai l The control interface provides a wrap-u p fu ncti on for m u lti ple optical m odu les Wrappin g can be perform ed i n two ways; hori zon tal l y and verti call y On e of the ways to organ i ze m u ltiple optical m odu les, such as a large n u m ber of WSSs wi th a larg e n um ber of ports, is hori zon tal integration, wh ere the trol interface m akes a sin g le conn ecti on to th e control in terfaces The secon d way is vertical i ntegration , wh ere vari ous kinds of d yn am ic m odu les, su ch as OXC or WXC, are wrapped together I n th e case of vertical integration , i nterpretation of com m ands for each d yn am ic m odul e sh ou ld be real ized, wh ere th e interpreted com m ands can be sent ou t to th e d yn am ic optical m odu l es from th e network control pl an e I EC 62343-6-1 0:201 © I EC 201 – 11 – For m aintenance of th e control ler, the control i n terface can keep the n ection and constrain t i nform ati on of d yn am ic m odu l es and th eir m on i tori n g statu s wi th th e n etwork trol plan e Th ese i nform ati on blocks can be used for provisi on in g an d m on itorin g purposes Typicall y, a look-u p table is set to th is block alon g wi th com pu ti ng an d in tell i g ence fu nction s, wh ich can be option al The com m unication fu nction is for transm issi on and reception of inform ati on to an d from the trol pl an e Conn ecti on inform ati on, constrain t i nform ation, an d m on itori ng status shou ld be shared throu gh th is com m unicati on fu ncti on, an d exam ples of inform ation shared throu g h th is functi on are m odu l e diti ons, al arm s, an d reports Fi gure shows th e fu nction coverage of th e in term ediate controll er Th is fu nction h as stri ct relati on to th e processing speed Proper tim i ng of the process n eeds to be set i n the trol l er IEC Figure – Function coverag e of the intermediate controller 6.3 Shared information between the control interface and the network control plane Paragraph descri bes necessary inform ation to be stored in the prog ram m abl e block Th e trol in terface an d th e n etwork control pl an e need to use config urati on, conn ection, an d m onitoring inform ati on Config urati on i nform ation i nclu des th e foll owi n g : – – – constrai n t inform ation ; com m and inform ation; i ntern al l ink i nform ati on Constrai nt inform ation has l im itation diti ons for d yn am ic m odu l es and restricted n ecti on pattern in th e controller For m aking an y special conn ection th at is out of th e sequ ence on th e process, th is i nform ation is u sed as disorder type Th e com m and i nform ati on is for transl ati n g an inh eren t com m and of th e m odu l e to a specific n etwork com m and Th is inform ation provi des a way to control m ul ti-vendor types of m odu l es The in tern al l ink inform ation is for fixed n ecti on of th e m odu le for a data plane in the system An y m odu l e characteristic, such as wavelen gth characteristics an d differences, can be stored in th e intern al li nk i nform ati on Con nection inform ation is prim aril y for networki ng of the optical ci rcu i ts i n the node system I n oth er words, th is i nform ation correspon ds to th e optical path havi n g data plan e nections Mon itori ng i nform ati on is g iven by perform ance m on i torin g i n th e system , and i t can be stored in th e prog ram m abl e block Shared i nform ation with descri ptions is descri bed i n Tabl e – 12 – I EC 62343-6-1 0:201 © I EC 201 Table – Shared information in the intermediate controller Category Confi g u rati on i nform ati on Information Example Con strai n t Li m i tati on or restri cti on for di ti ons/con necti on pattern s Com m and Com m and tran sl ati on of th e m odu l e I ntern al l i nk I n i ti al necti ons i n the system Con necti on i nform ati on - Mai n l y for n etworki ng of th e opti cal paths Mon i tori n g i nform ati on - Perform an ce m oni tori n g i n th e system Example of multi-degree ROADM systems An exam ple of a m ul tipl e d yn am ic m odu l e system has th e foll owi n g three bl ocks: an optical swi tch block, a wavel en gth swi tch block, an d an optical transcei vers an d el ectrical swi tches block Fig ure sh ows an exam pl e of a si n g le n ode of the m u ltiple d yn am ic m odul e system I t consists of an optical switch fu ncti on part, i nclu di ng an optical m esh n etwork, transcei ver for optical fibre transm issi on , WSS, an d TPA All d yn am ic m odul es i n the s ystem are control led throug h a u n ified i nterface, wh ich is an i nterm edi ate trol l er IEC Figure – Example of a multiple dynamic module system There are several types of m ulti-degree ROADM system s Fi g ure sh ows a config uration exam ple of 4-deg ree ROADM node arch itecture I t consists of arrayed -wavegu ide grati ngs, power spl i tters, wavelen gth selecti ve switch es (WSSs) , an d transcei vers (Tx/Rx) Th e sing l e interm ediate controll er for th ese com pon en ts can set in th e n ode system s A s ing l e m ultidegree ROADM system can be trol l ed by usin g the trol l er I EC 62343-6-1 0:201 © I EC 201 – 13 – IEC Figure – Example of 4-degree ROADM node architecture Fi gu re sh ows architecture for ROADMs wi th colourl ess an d n on-di recti on al capabil ity [4] This type of arch i tectu re provi des fu l l i ntercon nection am on g fibre rou tes, as well as ful l intercon n ection to add/drop ports Fig ure sh ows an exam pl e of a com pact pl an ar lig h twave circuit (PLC) -based tran spon der ag greg ator (TPA) to real i ze an y col our an d an y directi on config uration [5] The TPA can assi gn an y wavelen gth an d an y in pu t/ou tpu t fi bre wi thout si gn al ten ti on I m plem ented d yn am ic m odu les such as WSS, transcei vers, and cl i ent-side fibre cross nects are targ ets of th e trol IEC Figure – 3-degree ROADM node with colourless, non-directional add/drop ports – 14 – I EC 62343-6-1 0:201 © I EC 201 IEC Figure – Compact PLC-based transponder aggregator for colourless and directionless ROADM Conclusion I n dividu al trol of each of these d yn am ic m odu l es an d n etwork devices by u sin g a network trol pl ane is n ecessary to real i ze h i g h-perform ance node system s wi th a u n ifi ed sig n al or disag g reg ated si g nal im plem en tations This docum ent expl ained th e ceptual defin ition of an interm ediate controller th at trols m ul ti ple dyn am ic m odu l es an d n etwork devices alon g wi th tech nical tren ds I EC 62343-6-1 0:201 © I EC 201 – 15 – Bibliograph y [1 ] Open N etworkin g Fou ndati on, h ttps://www open n etworki n g org / [2] J un ya Ku rum ida, et al , "First dem onstration of u ltra-low-en erg y h i erarch ical m ul ti g ran u lar optical path n etwork d yn am ical l y trol led throu g h N SI -CS for video rel ated appl ications, " ECOC 201 PD [3] Ken-ich i Kitayam a, et al , "Ph oton ic network vision 2020 – Toward sm art ph otonic clou d", J ourn al of Ligh twave Tech n olog y, Vol 32, no 6, Au g ust 5, 201 [4] Sheryl L Woodward, et al , "I ntra-node tenti on in a d yn am ic, col orless, nondirection al ROADM, " OFC/N FOEC 201 0, PDPC8 [vi ewed 201 7-02-28] Available at: http://ieeexpl ore i eee org /docu m ent/5465769/ [5] Toshi o Watan abe, et al , "Com pact PLC-based transponder ag greg ator for colorl ess an d directi onl ess ROADM ", OFC/NFOEC 201 , OTu D3 [vi ewed 201 7-02-28] Avai lable at: https://www osapublish in g org/abstract cfm ?uri =OFC-201 -OTuD3 [6] I EC TR 62343-6-4, Dynamic modules – Design guides: Part 6-4: Reconfigurable optical add/drop multiplexer _ INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varembé PO Box 31 CH-1 21 Geneva 20 Switzerland Tel: + 41 22 91 02 1 Fax: + 41 22 91 03 00 info@iec.ch www.iec.ch