PON testing.pdf
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This document discusses fiber optic testing equipment and methods for different phases of fiber to the premises (FTTP) network deployment and maintenance. It recommends using optical time domain reflectometers (OTDRs) with multiple wavelengths to characterize fibers and locate faults. Centralized testing during construction can validate the network before activating services. Maintenance involves verifying power levels and continuity to troubleshoot issues without visiting customer sites using monitoring systems. Centralized and automated testing helps ensure high quality fiber connections and networks.
PON testing.pdf
- 1. XG(S)-PON 10G-EPON US B-PON G-PON E-PON RFoG US B-PON G-PON E-PON DS NG-PON2 US RF Overlay/ DOCSIS DS XG(S)-PON 10G-EPON DS NG-PON2 DS Window for in-service OTDR test (typ. 1625 / 1650nm) PtP WDM RFoG US (nm) λ Build & Construction Phase Requirements What to look for What to use Connector end face verification Dirty or damaged fiber connector end faces Inspection Scope FiberChek/P5000i Feeder & distribution fiber characterization (mixed fiber types, splices, connectors) Fiber lengths are as laid out in the design spec Bends Splice loss under 0.1dB OTDR (Real-time when splicing) Bi-Dir IL/ORL/OTDR (for commissioning) FiberComplete Commissioning the end-to-end PON once splitters and drop boxes connected in order to prove the final build is within network equipment specifications. (ONT/ONU to OLT direction) Excessive splitter losses Good inter-connections at Splitters, Drop Terminals & Patch Panels PON OTDR SmartOTDR with FTTH-SLM Documentation and reporting Test fails, missing or duplicated results Instrument / Cloud StrataSync Test Process Automation (TPA) Suite Construction Phase: Centralized Test Alternate centralized approach to commission the end-to-end PON as it is built out. (OLT to ONT/ONU direction) As above plus ODN Insertion Loss PON Test System ONMSi or SmartOTU Number of ports Insertion loss 2 3 dB 4 6 dB 8 9 dB 16 12 dB 32 15 dB 64 18 dB 128 21 dB Network Activation Phase Requirements What to look for What to use Connector end face verification Dirty or damaged fiber connector end faces Inspection Scope FiberChek/P5000i Downstream power measurement G-PON / XGS-PON Bad DS power level Selective power meter OLP-37X V2 Downstream power measurement G-PON / XGS-PON Drop fiber certification Splitter continuity check (to OLT) ONT/ONU connectivity check Bad DS power levels Confirm no bends, breaks or excessive losses within the drop fiber Confirm drop fiber is connected to a splitter port and there is continuity to the OLT Confirm drop fiber into premises is good and ONT/ONU is connected Optical Fiber Meter Optimeter Accurately measure downstream & upstream power with multi- wavelength selective power meter G-PON / XGS-PON / NG-PON2 Bad US/DS power levels ONT/ONU is alive and responding to OLT PON Power Meters OLP-87 OLP-88 Activation verification (PON-ID) ONT/ONU connected to correct port of OLT TRUE-PON Tester with G-PON data analysis OLP-88 Documentation and reporting Test fails, missing or duplicated results Instrument / Cloud StrataSync Network Activation Phase: Centralized Test Verify tech install or self install is complete to trigger service activation Fiber Continuity to the premises Verify reflector installation in the home PON Test System ONMSi or SmartOTU Service Activation Phase Requirements What to look for What to use Verify PON service delivery independently of ONT/ONU G-PON or XGS-PON connection Is the PON network connection good Does OLT respond Can ONT/ONU get an IP address PON throughput speed test PON network & in-premises service tester NSC-100 In-premises service distribution test (Ethernet & WiFi connections) IP address allocated. Ethernet & WiFi throughput speeds WiFi channel & signal strength PON network & in-premises service tester NSC-100 Documentation and reporting Test fails, missing or duplicated results Instrument / Cloud StrataSync Maintenance & Troubleshooting Phase Requirements What to look for What to use Connector end face verification Dirty or damaged fiber connector end faces Inspection Scope FiberChek/P5000i Downstream power measurement G-PON / XGS-PON Bad DS power level Selective power meter OLP-37X V2 Downstream power measurement G-PON / XGS-PON Drop fiber certification Splitter continuity check (to OLT) ONT/ONU connectivity check Bad DS power levels Confirm no bends, breaks or excessive losses within the drop fiber Confirm drop fiber is connected to a splitter port and there is continuity to the OLT Confirm drop fiber into premises is good and ONT/ONU is connected Optical Fiber Meter Optimeter Accurately measure downstream & upstream power with multi-wavelength selective power meter G-PON / XGS-PON / NG-PON2 Bad US/DS power levels. ONT/ONU is alive and responding to OLT Through mode PON power meter OLP-87 OLP-88 Verify PON service delivery independently of ONT/ONU G-PON or XGS-PON connection Is the PON network connection good Does OLT respond Can ONT/ONU get an IP address PON throughput speed test PON service meter NSC-100 In-premises service distribution test (Ethernet & WiFi connections) IP address allocated Ethernet & WiFi throughput speeds WiFi channel & signal strength PON service meter NSC-100 Check fiber continuity with In-Service 1625/1650nm PON OTDR or fiber meter (ONT/ONU to OLT direction) Excessive splitter losses Good inter-connections at Splitters, Drop Terminals, Patch Panels Locate fiber breaks PON OTDR or Optical Fiber Meter SmartOTDR with FTTH-SLM Optimeter Check fiber continuity with In-Service 1650nm OTDR (OLT to ONT/ONU direction) Fiber continuity to premises Verify reflector installation in home Locate fiber breaks Fiber Monitoring ONMSi G-PON XGS-PON (sym) NG-PON2 GE-PON 10G-EPON 100G-EPON Standards ITU-T G.984 (2003) ITU-T G.987.1 (2016) ITU-T G.989 (2015) IEEE 802.3ah (2004) IEEE 802.3av (2009) IEEE 802.3ca (2019 TBD) DS / US Data Rates 2.4 / 1.2 GBps 10 / 10 GBps 40 (4x10) / 40 (4x10) GBps 1.25 / 1.25 GBps 10 / 10 GBps Up to 100 / 100 GBps Splitting Ratio up to 1:64 (128) up to 1:128 (256) up to 1:128 (256) up to 1:64 up to 1:128 TBD Fiber Type G.652 G.652 / G.657 (for new inst.) G.652 / G.657 (for new inst.) G.652 G.652 / G.657 (for new inst.) G.652 / G.657 (for new inst.) Max Loss 32 dB 35 dB 35 dB 29 dB 29 dB TBD Co-existence N/A YES with G-PON YES with G-PON and XGS-PON N/A Yes with GE-PON YES with GE-PON and 10G-EPON Tips • Feeder & distribution fibers: OTDR uni-directional test as a minimum, better to test bi-directionally as this gives more accurate results and finds more items (potential faults) that might be hidden by OTDR dead zones. Look for solutions that fully automate the process and use only a single test port in order to significantly reduce test and report generation times • Use a minimum of 2 wavelengths for bend detection, typically 1310 & 1550nm, preferably a third at 1625 or 1650nm as this improves bend detection and future proofs the network for NG- PON2, also gives you a solution that can be used for in-service troubleshooting once the PON is activated. • 1490nm OTDR testing yields no better results than 1550nm test. Tip: • Alien device = CPE not approved by Service Provider, not fully under OLT control (e.g. basic media converter) typically not an ONT/ONU (e.g. media converter) which will disrupt PON service/traffic Through Mode & Upstream Burst Mode • Wavelength selectivity allows independent and simultaneous measurement of multiple PON services • Through mode, insert a PON power meter into a network to measure both upstream and downstream power levels, instrument must have low IL • Must support burst mode measurement because upstream wavelengths use TDM G-PON Data Analysis • G-PON & XGS-PON contain network specific information (PON-ID) that can be used to enable service activation test & troubleshooting G-PON data analysis enables • Verification of ONU/ONT activation process • Identification of OLT Port and ONU/ONT serial number • Detection of Rogue ONUs/ONTs and Alien devices • In-service measurement of ODN Insertion Loss Note: Cascaded splitters always induce a higher loss than a single splitter (for the same split ratio) Contamination is one of the main causes of optical network failure. Just one particle of dust can cause permanent damage and interrupt traffic. Inspection is the only way to determine if fiber optic connectors need to be cleaned or replaced before coupling. 1260 1280 1290 1330 1480 1500 1524 1544 1550 1598 1603 1625 1650 1575 – 1581 CO . . . . . . . . . . . . . . Central Office NOC . . . . . . . . . . . . . Network Operation Center FTTH . . . . . . . . . . . . . Fiber To The Home PON . . . . . . . . . . . . . Passive Optical Network DS . . . . . . . . . . . . . . Downstream US . . . . . . . . . . . . . . Upstream B-PON . . . . . . . . . . . . Broadband Passive Optical Network E-PON . . . . . . . . . . . . Ethernet Passive Optical Network (IEEE) 10G-EPON . . . . . . . . . . 10 Gigabit Ethernet PON (IEEE) G-PON . . . . . . . . . . . Gigabit Passive Optical Network (ITU-T) XGS-PON . . . . . . . . . . 10 Gigabit Symmetrical PON (ITU-T) NG-PON2 . . . . . . . . . . Next Generation PON (ITU-T) ODN . . . . . . . . . . . . . Optical Distribution Network OLT . . . . . . . . . . . . . . Optical Line Terminal ONT . . . . . . . . . . . . . Optical Network Terminal (ITU-T) ONU . . . . . . . . . . . . . Optical Network Unit (IEEE) IBYC . . . . . . . . . . . . . Inspect Before You Connect IL . . . . . . . . . . . . . . . Insertion Loss ORL . . . . . . . . . . . . . Optical Return Loss OTDR . . . . . . . . . . . . . Optical Time Domain Reflectometer RFoG . . . . . . . . . . . . . Radio Frequency Over Glass (DOCSIS) RF Overlay . . . . . . . . . . Radio Frequency Overlay TDM . . . . . . . . . . . . . Time Division Multiplexing WDM . . . . . . . . . . . . . Wavelength Division Multiplexing CEx . . . . . . . . . . . . . . Coexistence Element WM . . . . . . . . . . . . . Wavelength Multiplexer Automated objective assessment, with clear pass/fail information, based on industry standards (such as IEC 61300- 3-35) verses subjective assessment is the only way to ensure high quality and reliable connections and avoid damage to expensive equipment (laser Tx/Rx, switches & routers). FTTH-SLM (SmartLink Mapper) is an OTDR software application dedicated to FTTH/PON OTDR testing, to characterize each section of the network as well as passive components such as splitters, connectors and splices. It dynamically adjusts the testing parameters and automatically performs multiple measurements to achieve the optimum test results. All the information gathered is displayed as a single icon-based view and a combined OTDR trace. Note: Insertion loss is the same for both types of splitter (1xN & 2xN) but OTDR testing output to input result is different — loss for 2xN is 1.5dB lower than loss shown in the table Tips • To verify DS power level only, meter must be wavelength selective if there is RFoG, Video Overlay or Co-existence of multiple PON services (Note: you cannot use a broadband power meter in those situations) • To verify DS and US power levels for the ONT/ONU and that the device is responding to the OLT you need a through mode PON power meter Tips • Emulate an ONT to prove the PON network delivery is good and validate service delivery to the premises (PON interface) • Test Ethernet and WiFi service distribution to prevent future call backs Tips • OTDR test using filtered 1625 or 1650nm so you don’t disrupt live services to other customers • Use a PON OTDR which utilises a multiple pulse acquisition technique with a dedicated test app in order to test through splitters (single or cascaded) and locate faults on any section of the PON • From the field; check for fiber continuity from premises to the CO (ONT/ONU to OLT) with PON OTDR or fiber meter • Centrally; check for fiber continuity from the CO to the premises (OLT to ONT/ONU) with monitoring tools Splitter port losses PON Standards: Evolution and Deployment PON Spectrum: Wavelength Allocation and Co-existence Plan Acronyms and Abbreviations Centralized PON Construction Qualification: Centralized PON Test is used to characterize, validate and map end to end PON networks remotely from the CO to the termination point. The network is tested as it’s built creating a baseline to allow automatic location of faults or damage, saving many hours of test set up, test acquisition and documentation. Centralized PON Network Monitoring with a Switched OTDR: Optical test heads can automatically monitor and locate problems in PON networks. This system checks for fiber continuity from the CO to the customer and is the only way to know whether problems stem from the physical infrastructure (fiber, splitter, connector) or the equipment (OLT, ONU, ONT) without visiting the premises. Test Process Automation (TPA) allows your team to deliver expert-level test results and close projects on the first try, every time. TPA is a closed loop test system that optimizes workflows, eliminates manual, error prone work and automates immediate data reporting for job close out, team progress updates and network health analytics. Execute jobs efficiently to ensure high quality network builds, rapid turn-up/activation and enhanced operational visibility. Inspect Before You Connect (IBYC) PON Power Meter & PON Data Analysis Simplifying OTDR with FTTH-SLM Central Office, Head End or Exchange Build & Construction Service Activation Network Activation Maintenance & Troubleshooting StrataSync Test Process Automation Suite for Field Test Efficiency PON Test System Input Outputs I1 I1 I2 O2 O2 O3 O3 1 x N Optical Splitter Dirty Fail: Clean & Re-inspect Instrument Available OLT GPON DS US 10G-EPON OLT RFoG OLT Through-Mode OPM NG-PON2 OLT (TWDM) WDM WDM OLT ONT 1xn 1xn ONT ONT 1 ONT n Tech calls for trace with mobile device The peak of ONT 1 is missing 1310 nm 1490 nm Switch In-Service OTDR 1650 nm Analysis & Reporting Data Management Job Execution Job Definition Instrument Configuration StrataSync Fail: Replace Connector Pass: All good — Move on Damaged T-BERD/MTS FiberComplete ONMSi & SmartOTU RF Video G-PON OLT XGS-PON OLT 4/8λ 4/8λ NG-PON2 OLT (TWDM) WM GPON ONT NG- PON2 ONT NG- PON2 ONT XGS- PON ONT CEx Patch Panel Splitter 1 Splitter 2 FiberChek Fiber Inspection OLP-37X V2 or OLP-87/88 VoIP Router Rack Server Laptop STB TV Clean 2 x N Optical Splitter X Splitter NG-PON2 NG-PON2 10G-EPON RFoG G-PON Central Office CEx SmartOTDR & FTTH-SLM Optimeter Network & Service Companion NSC-100 Drop Terminals Modem To learn more, visit viavisolutions.com/ponsolutions, or scan © 2019 VIAVI Solutions Inc. Product specifications and descriptions in this document are subject to change without notice. pon-po-fop-tm-ae 30162962 904 0621 Understanding Passive Optical Network Testing