10G_GPON技術(shù)基礎(chǔ)

1、HUAWEI TECHNOLOGIES CO., LTDHuawei Confidential Security Level: 2021-11-1810G GPON10G GPON技術(shù)基礎(chǔ)技術(shù)基礎(chǔ)HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 2目錄GPON技術(shù)回顧技術(shù)回顧10G GPON標(biāo)準(zhǔn)和進(jìn)展標(biāo)準(zhǔn)和進(jìn)展10G GPON技術(shù)基礎(chǔ)技術(shù)基礎(chǔ)10G GPON演進(jìn)演進(jìn)HUAWEI TECHNOLOGIES CO., LTD.HUAWEI Confidential Page 3ITU-T G.984.3GPON TC層規(guī)格要求GTC復(fù)用結(jié)構(gòu)

2、及協(xié)議棧介紹GTC幀結(jié)構(gòu)介紹ONU注冊(cè)激活流程DBA規(guī)格要求告警和性能ITU-T G-984.1/2/3/4產(chǎn)品開(kāi)發(fā)簡(jiǎn)單產(chǎn)品開(kāi)發(fā)簡(jiǎn)單產(chǎn)品兼容性強(qiáng)產(chǎn)品兼容性強(qiáng)ITU-T G.984.1GPON網(wǎng)絡(luò)參數(shù)說(shuō)明保護(hù)倒換組網(wǎng)要求ITU-T G.984.4OMCI消息結(jié)構(gòu)介紹OMCI設(shè)備管理框架OMCI實(shí)現(xiàn)原理簡(jiǎn)述ITU-T G.984.2PMD層規(guī)格要求2.488Gbps下行光接口參數(shù)規(guī)格要求1.244Gbps上行光接口參數(shù)規(guī)格要求物理層開(kāi)銷(xiāo)分配GPONGPON標(biāo)準(zhǔn)協(xié)議標(biāo)準(zhǔn)協(xié)議HUAWEI TECHNOLOGIES CO., LTD.HUAWEI Confidential Page 4 廣播方式：廣播方

3、式：GPONGPON的下行幀長(zhǎng)為固定的的下行幀長(zhǎng)為固定的125us125us，下行為廣播方式，所有的，下行為廣播方式，所有的ONUONU都能收到相同的數(shù)據(jù)，但是通過(guò)都能收到相同的數(shù)據(jù)，但是通過(guò)GEMPORT IDGEMPORT ID來(lái)區(qū)分不同的業(yè)務(wù)的數(shù)據(jù)，來(lái)區(qū)分不同的業(yè)務(wù)的數(shù)據(jù)，ONU ONU 通過(guò)過(guò)濾來(lái)接收屬于自己的數(shù)據(jù)。通過(guò)過(guò)濾來(lái)接收屬于自己的數(shù)據(jù)。GPONGPON原理原理-下行數(shù)據(jù)下行數(shù)據(jù)HUAWEI TECHNOLOGIES CO., LTD.HUAWEI Confidential Page 5 TDMATDMA方式：方式：GPONGPON的上行是通過(guò)的上行是通過(guò)TDMATDMA（時(shí)分

4、復(fù)用）的方式傳輸數(shù)據(jù)，上行鏈路（時(shí)分復(fù)用）的方式傳輸數(shù)據(jù)，上行鏈路被分成不同的時(shí)隙，根據(jù)下行幀的被分成不同的時(shí)隙，根據(jù)下行幀的upstream bandwidth mapupstream bandwidth map字段來(lái)給每個(gè)字段來(lái)給每個(gè)ONUONU分配上行時(shí)隙，這樣所有的分配上行時(shí)隙，這樣所有的ONUONU就可以按照一定的秩序發(fā)送自己的數(shù)據(jù)了，不會(huì)就可以按照一定的秩序發(fā)送自己的數(shù)據(jù)了，不會(huì)產(chǎn)生為了爭(zhēng)奪時(shí)隙而沖突。每幀共有產(chǎn)生為了爭(zhēng)奪時(shí)隙而沖突。每幀共有91209120個(gè)時(shí)隙。個(gè)時(shí)隙。GPONGPON原理原理-上行數(shù)據(jù)上行數(shù)據(jù)HUAWEI TECHNOLOGIES CO., LTD.HUAWE

5、I Confidential Page 6GPON GPON 協(xié)議棧協(xié)議棧HUAWEI TECHNOLOGIES CO., LTD.HUAWEI Confidential Page 7Physical Control Block Downstream (PCBd)PayloadAllocIDStartEndAllocIDStartEnd1100200 x300500T-CONT1(ONT 1)T-CONT x(ONT 2)Slot 100Slot 200Slot 300Slot 500PLOuPLOAMuPLSuDBRu xPayload xDBRu YPayload yUpstream Ba

6、ndwidth Map125usDownstream FramingUpstream FramingOLT ONT 1ONT 64GPONGPON幀結(jié)構(gòu)幀結(jié)構(gòu)AllocIDStartEndy501650 ONT 21 1x xy yT-CONT y(ONT 2)Slot 650Slot 501T-CONT x xT-CONT yHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 8目錄GPON技術(shù)回顧技術(shù)回顧10G GPON標(biāo)準(zhǔn)和進(jìn)展標(biāo)準(zhǔn)和進(jìn)展10G GPON技術(shù)基礎(chǔ)技術(shù)基礎(chǔ)10G GPON演進(jìn)演進(jìn)HUAWEI TECHNOLOGIES

7、CO., LTD.Huawei Confidential Page 9Page 9FSAN把下一代PON分成了兩個(gè)階段:NGA1是在TDMA PON的基礎(chǔ)上做更高的速度。其速率定義為10Gbps。NGA2是對(duì)NG-PON1一些更可能的技術(shù)升級(jí)和一些模糊目標(biāo)的探討。比如象：WDM PON, OFDM 等等。 NG-PON可以很好的應(yīng)用于FTTx，如企業(yè)用戶(hù)，個(gè)人用戶(hù)和移動(dòng)回傳等。10G GPON10G GPON的標(biāo)準(zhǔn)發(fā)展（的標(biāo)準(zhǔn)發(fā)展（1 1）HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 10Page 10GPONXGPON1NGA1N

8、GA22009201020112012 2.5G/10G2010.6 Publish10G GPON的標(biāo)準(zhǔn)發(fā)展（2）10G/2.5GODN reuseODN reuse is not obligation l ITU NGA1 XGPON1： 10G GPON Asymmetric： Published G.987.1&G.987.2 ; G.987.3&G. 988 was published in June 2010.l ITU NGA1 XGPON2： 10G GPON Symmetric： Discussion starts in 2010.Q1. One possib

9、ility is to overleap symmetric 10G GPON and directly migration to NGA2.l ITU NGA2： Start in 2010 Q1 and discuss the technology trend.XGPON2WDM-PON, Stacked， 40G, 10G/10GHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 11Page 1110G GPON的標(biāo)準(zhǔn)發(fā)展（3）XG-PON1: Asymmetric 10G/2.5G 10G GPONlG.987x is base

10、d on the GPON standard G.984x，and compatible with G.984.lG.987x inherits the GPON characteristic, and also supports the high quality & full service experience.lG.987x shares the same management mechanism, and can realizes easy upgrade from the current GPON OSS system;lG.987.1， G.987.2： Finished

11、in Oct. 2009;lG.987.3， G.988(G.OMCI)：Finished in June 2010.HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 1210G GPON產(chǎn)業(yè)鏈發(fā)展HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 1310G GPON10G GPON設(shè)備廠(chǎng)家現(xiàn)狀設(shè)備廠(chǎng)家現(xiàn)狀HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 14目錄GPON技術(shù)回顧技術(shù)回顧10G GPON標(biāo)準(zhǔn)和進(jìn)展標(biāo)準(zhǔn)和進(jìn)展

12、10G GPON技術(shù)基礎(chǔ)技術(shù)基礎(chǔ)10G GPON演進(jìn)演進(jìn)HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 15Page 1510G GPON10G GPON和和GPONGPON產(chǎn)品規(guī)格的主要差異產(chǎn)品規(guī)格的主要差異10G GPON（G.987）GPON（G.984）波長(zhǎng)范圍波長(zhǎng)范圍DS 15751580nm US 12601280nmDS 1480-1500nmUS 1260-1360nm速率速率DS 9.95328GbpsUS 2.48832GbpsDS 2.48832GbpsUS 1.24416Gbps/2.48832Gbps功率預(yù)算

13、功率預(yù)算29dB/31dB可擴(kuò)展至33dB/35dBClass A: 5-20dBClass B: 10-25dBClass C: 15-30dBClass C+: 17-32dB最大邏輯距離最大邏輯距離 60km（目前樣機(jī)規(guī)格為100km）60km最大距離差最大距離差 20km（目前樣機(jī)規(guī)格為40km）20km最大分支比最大分支比 1：64（目前樣機(jī)規(guī)格為1：256）1：64FEC下行：強(qiáng)FEC（強(qiáng)制實(shí)現(xiàn)，強(qiáng)制使用）上行：弱FEC（強(qiáng)制實(shí)現(xiàn)，可選使用）上下行FEC強(qiáng)度一致，都是強(qiáng)制實(shí)現(xiàn)，可選使用幀結(jié)構(gòu)幀結(jié)構(gòu)XGEMGEM認(rèn)證認(rèn)證OLT和ONU雙向認(rèn)證OLT對(duì)ONU單向認(rèn)證每每PON口支持口支

14、持TCONT數(shù)目數(shù)目2048（其中非FIX類(lèi)型的個(gè)數(shù)512）最大1024（其中非FIX類(lèi)型的個(gè)數(shù)512）HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 16Page 16GPON V.S. 10G GPON GPON V.S. 10G GPON 關(guān)鍵改進(jìn)點(diǎn)關(guān)鍵改進(jìn)點(diǎn)G-PMDhigher Data rateLonger distanceImproved Power budgetLarger Split ratioXG-PMDG-TCMore effective framingMore flexible DBAEnhanced Secu

15、rity featuresnecessary power saving featuresXG-TCGPON OMCIBackward compatibility with GPONAdaptive to future useGeneric OMCIIntegrated IOP specsGeneral requirementGeneral requirementWDM coexistence & smooth migrationG.984 seriesG.987 series200803p;200910amd1200303p;200803amd1200803p;200902amd1;2

16、00911amd2;200803p;200906amd1;200911amd2;201001p201001p?p PHY層的改進(jìn)體現(xiàn)了運(yùn)營(yíng)商對(duì)下一代PON設(shè)計(jì)的基本思路；pTC層的改進(jìn)提供了對(duì)下一代PON網(wǎng)絡(luò)的系統(tǒng)級(jí)適配；p管理層相對(duì)獨(dú)立，改動(dòng)影響較小。HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 17Page 17G.987.1 V.S. G.984.1 G.987.1 V.S. G.984.1 通過(guò)通過(guò)WDM overlayWDM overlay實(shí)現(xiàn)共存實(shí)現(xiàn)共存ONUONUONUONUXG-ONUGPON OLTXG-ONUXG

17、-ONUXG-ONUXG-OLTWDM1r1550 RF1550 RFGPON U/SXGPON U/SGPON D/SXGPON D/S12601280129013301480150015751580wavelength planWDM overlay G.984.5amd1p 對(duì)已部署的GPON ODN網(wǎng)絡(luò)無(wú)影響HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 18Page 18G.987.2 V.S. G.984.2 - G.987.2 V.S. G.984.2 - 更快，更多，更遠(yuǎn)更快，更多，更遠(yuǎn)ContentContentGP

18、ONGPON10G-PON10G-PON線(xiàn)路速率線(xiàn)路速率2.5G DS / 1.25G US10G DS / 2.5G or 5G US 精確線(xiàn)路速率精確線(xiàn)路速率2.48832 Gb/s D/S 9.95328 Gb/s D/S / 2.48832 Gb/s U/S 波長(zhǎng)范圍波長(zhǎng)范圍1480-1550nm DS1290-1330nm US1575-1580nm DS1260-1280nm US分光比分光比32/6464最大傳輸距離最大傳輸距離20 km (Logical: 60 km) 20km(Logical: 60 km) 最大差分距離最大差分距離20KmUp to 40km光功率預(yù)算光功

19、率預(yù)算ClassB: 10- 25dB Class B+: 13-28dBClassC: 15-30dB ClassC+: 17-32dB N1（14 29dB)N2（16 31dB) 可擴(kuò)展到 33/35dBHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 19Page 19G.987.3 V.S. G.984.3 - G.987.3 V.S. G.984.3 - 增強(qiáng)和改進(jìn)增強(qiáng)和改進(jìn)featuresfeaturesitemsitemsG.984.3G.984.3G.987.3G.987.3Whole lookWhole lookPr

20、otocol layeringGPON adaptation GTC framing PHYservice adaptation XGTC framing XGTC PHY adaptation PHY. See slide 10.Sub-layer functionsSub-layer functionsFEC D/S - RS(255,239) , mandatory implemented and optionally on;U/S RS(248, 232), optionally implemented and optionally on.D/S - RS(248, 216), man

21、datory implemented and mandatory on;U/S RS(248, 232), mandatory implemented and optionally on.scrambling8 bit scrambler: polynomial used is x7 + x6 + 158 bit scrambler: polynomial used is x58 + x39 + 1Basic TC Basic TC parametersparametersONU ID8 bit length; thus support up to 256 split ration. (See

22、 G.984.3 5.5.2) 10 bit length; thus support up to 1024 split ration. (See G.974.3 6.4.2) Alloc-ID12 bit length; thus support value range from 0 to 4095. (See G.984.3 5.5.3) 14 bit length; thus support value range from 0 to 16383 . (See G.987.3 6.4.3)GEM ID12 bit length; thus support value range from

23、 0 to 4095. (See G.984.3 5.5.5) 16 bit length; thus support value range from 0 to 65535 . (See G.987.3 6.4.4)DBADBATraffic descriptorOnly applied in U/SCould be applied in both U/S and D/SBandwidth allocation rulesConsecutive allocation;not require to cross the PHY frame boundary per burstNot recomm

24、end consecutive allocations;an ONU burst can cross the PHY frame boundary pTC層對(duì)比HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 20Page 20G.987.3 V.S. G.984.3 - G.987.3 V.S. G.984.3 - 增強(qiáng)和改進(jìn)增強(qiáng)和改進(jìn)FeaturesFeaturesItemsItemsG.984.3G.984.3G.987.3G.987.3FramingFramingD/S GTCn basic frame architecture

25、s are the samen fields are different in details n word alignment are required for simplifying processingn See slides 11 - 13 U/S GTCGEMServices mapping Services mapping into into GEM/XGEMGEM/XGEMn Native TDM; n Ethernet; n IP; n MPLS; n SDHn Ethernetn MPLSPLOAMPLOAMOverviewn enlarged size n integrit

26、y check enhancedn robustness enhancedD/S PLOAMSimplified message systems.U/S PLAOMSimplified message systems.SecuritySecurityEncryptionKey switchover changed.AuthenticationAuthentication enhanced.Power Power ManagementManagementNot a formal standardized contentPick up two modes for power saving, see

27、 slide.HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 21Page 21G.987.3 V.S. G.984.3 - G.987.3 V.S. G.984.3 - 分層對(duì)比分層對(duì)比p分層 通過(guò)增加一個(gè)新的子層實(shí)現(xiàn)一個(gè)更清晰的協(xié)議棧PLOAMOMCIGEMGTC Framing sublayerGPON PMDPLOAMOMCIGEMOMCI adapterGEM adapterDBA controlGPON PMDXG-PON adaptation layerXGTC PHY adaptation sublayerGTC Fr

28、aming sublayerHeaderGEM/XGEM payloadHeaderGTC/XGTC payloadUser dataGTC/XGTC payloadFEC data PSBdScrambled PHY frame payloadGTC/XGTC framePFEC data PFEC data POMCI adapterGEM adapterDBA controlGPON adaptation layerFEC codeword FEC codewordFEC codeword GEM/XGEM framing GTC/XGTC frame GTC/XGTC framing

29、FEC + scrambling + PHY headerGPON TC layerXG-PON TC layerHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 22Page 22G.987.3 V.S. G.984.3 G.987.3 V.S. G.984.3 幀結(jié)構(gòu)對(duì)比幀結(jié)構(gòu)對(duì)比p 下行GTC/XGTC幀結(jié)構(gòu)G.984.3 GTC D/S G.984.3 GTC D/S frame structureframe structureG.987.3 GTC D/S G.987.3 GTC D/S frame structurefram

30、e structurePCBdGTC PayloadPsync4bytePLOAMd13byteUS BWmapN 8byteAlloction struction 18byteIdent4byteAlloction struction28byte.Alloction structionN8byteBIP1bytePlend4bytePlend4byteUS BWmapN 8byteFEC Ind1bitREV1bitSuperframe counter30bitBlen12bitAlen12bitCRC8bitAlloc-ID12bitFlags12bitSStart2byteSStop2b

31、yteCRC1byteXGTC headerXGTC PayloadHLend4bytePLOAMdsP 48byteBWmapN*8byteAlloction struction 18byteAlloc-ID14bitFlags2bitStart time2byteGrant Size2byteBProfile2bitHEC13bitBWmapN 8byteBWMap length11bitPLOAM count8bitHEC13bitAlloction struction28byte.Alloction structionN8byteFWI1bitGTC headerGTC payload

32、125usHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 23Page 23p 上行幀結(jié)構(gòu)G.984.3 GTC U/S frame structureG.987.3 GTC U/S frame structureG.987.3 V.S. G.984.3 G.987.3 V.S. G.984.3 幀結(jié)構(gòu)對(duì)比幀結(jié)構(gòu)對(duì)比PreambleDelimiterBIP1byteONU-ID1byteInd1bytePLOAMu13 or 0byteDBRuGTC PayloadDBRuGTC PayloadAllocationAllocation

33、.DBA1|2byteCRC1byteBurst headerPLOuONU-ID10 bitInd9 bitBIP1 byteDBRuGTC PayloadDBRuGTC PayloadAllocationAllocation.BuffOcc3 byteCRC1 byteHEC13bitXGTCheaderXGTCTrailerPLOAMu0 or 48 byte burst i125us burst j burst kHUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 24Page 24p the fragmentation rule

34、 is the same as that of GPON except the pre-emption is not allowed;p the idle frame definition is different from GPONn carried in dedicated XGEM Port ID 0 xFFFF;n size equal to multiple of 4; n the content is not defined.pGEM/XGEM 幀結(jié)構(gòu)G.984.3 GEM frame G.984.3 GEM frame structurestructureG.987.3 GEM

35、frame G.987.3 GEM frame structurestructureG.987.3 V.S. G.984.3 G.987.3 V.S. G.984.3 幀結(jié)構(gòu)對(duì)比幀結(jié)構(gòu)對(duì)比XGEM PayloadXGEMheaderPLI14bitKey Index2bitXGEM Port -ID16bitOptions18bitLF1bitHEC13bitGEM PayloadL byteGEMheaderPLI12bitPort ID12bitPTI3bitHEC13bitPayloadheaderHUAWEI TECHNOLOGIES CO., LTD.Huawei Confident

36、ial Page 25Page 25p PLOAM消息G.984.3G.984.3G.987.3G.987.3StructureStructuresizesize13 bytes48 bytesrateratel D/S: One per frame;l U/S: One per burstl D/S: no more than one broadcast message; not more than one unicast message per ONU;l U/S: one per burst Channel robustnessChannel robustnessweakenhanced

37、 Message integrity checkMessage integrity checkCRC-8AES-CMACG.987.3 V.S. G.984.3 PLOAMG.987.3 V.S. G.984.3 PLOAM消息對(duì)比消息對(duì)比ONU IDMessage IDDataCRCOctets11101ONU IDMessage IDMessage contentMICSeqNoOctets1-2345-4041-48HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 26Page 26p 下行PLOAM消息FunctionsFunc

38、tionsG.984.3G.984.3G.987.3G.987.3PHY framing features PHY framing features configurationconfigurationnUpstream_OverheadnExtended_Burst_Length nProfileActivationActivationn Assign_ONU-ID n Ranging_Time n Deactivate_ONU-ID n Disable_Serial_ Number n Assign_Alloc-ID n POP-UPn Assign_ONU-ID n Ranging_Ti

39、me n Deactivate_ONU-ID n Disable_Serial_ Number n Assign_Alloc-ID Protection auto SwitchoverProtection auto Switchovern PSTn PSTEncryption Key relatedEncryption Key relatedn request_keyn Key_swithcing_timen Key_ControlPower savingPower savingn nonen Sleep_AllowAuthenticationAuthenticationn Request P

40、asswordn Request_RegistrationError controlError controln No message;n PEE.n noneOMCC build-upOMCC build-upn Configure Port-IDn noneGEM encryptionGEM encryptionnEncrypted_Port-IDnnoneG.987.3 V.S. G.984.3 PLOAMG.987.3 V.S. G.984.3 PLOAM消息對(duì)比消息對(duì)比HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 27Pa

41、ge 27p 上行PLOAM消息FunctionsG.984.3G.984.3G.987.3G.987.3Activationn Serial_Number_ONUn Serial_Number_ONU Encryption Key relatedn Encryption_Keyn Key_ReportAuthenticationn Passwordn RegistrationProtection auto switchovern PSTn PSTError controln No message;n REI.n noneTrouble shootingn Dying-Gaspn noneRo

42、bustness checkn ACKn ACKPower savingn nonenSleep requestG.987.3 V.S. G.984.3 PLOAMG.987.3 V.S. G.984.3 PLOAM消息對(duì)比消息對(duì)比HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 28Page 28p 增強(qiáng)安全特性FeaturesFeaturesG.984.3G.984.3G.987.3G.987.3Threat modelThreat modeln D/S transmission sniffingn D/S transmission

43、 sniffing n theft of servicen man in the middle attackEncryption algorithmEncryption algorithmn AES-128n AES-128Encryption Key updateEncryption Key updaten superframe counter is used for keeping sync since there is only D/S encryption requiredn its initiated by the OLT and there are several communic

44、ations between OLT and ONU, since the U/S encryption may be requiredUser Data protectionUser Data protectionn D/S Unicast (mandatory)n D/S Unicast (mandatory)n D/S multicast (optional)n U/S unicast (optional)Managing integrity Managing integrity protectionprotectionn PLOAM CRC8n OMCI CRC32n PLOAM AE

45、S-CMACn OMCI- AES-CMACAuthenticationAuthenticationn ONU authentication based on PSWD - optionaln mutual authentication thru OMCI - optional n ONU authentication based on Registration ID - mandatoryn mutual authentication thru OMCI - optional n mutual authentication based on 802.1x - optionalG.987.3

46、V.S. G.984.3 G.987.3 V.S. G.984.3 安全特性對(duì)比安全特性對(duì)比HUAWEI TECHNOLOGIES CO., LTD.Huawei Confidential Page 29Page 29Page 29ContentContentG.984.4 OMCIG.984.4 OMCIG.988 Generic OMCIG.988 Generic OMCIOMCC EstablishmentOMCC Establishmentn explicitly using the configure PORT-ID PLOAMn automatically generated af

47、ter the assign ONU-id PLOAM, see slideOMCI message integrity OMCI message integrity protectionprotectionn CRC-32 within OMCI AAL5 trailer, as specified in I.3165n 32-bits in OMCI MIC trailer. Generated from AES-CMAC, see slide OMCI encryptionOMCI encryptionn OLT explicitly issuing the encrypted_port-ID PLOAMn OLT implicitly issues OMCI me