Sánchez Fuentes, RafaelHernández Gutiérrez, José AlbertoLarrabeiti López, David2017-06-052017-06-052014-02-19IEEE Communications Magazine, 2014, 52 (2), pp. S7-S13.0163-6804http://hdl.handle.net/10016/24627WDM-PONs have recently emerged to provide dedicated and separated point-to-point wavelengths to individual optical network units. In addition, the recently standardized Ethernet OAM capabilities under the IEEE 802.1ag standard and ITU-T Recommendation Y.1731, together with state-of-the-art optical timedomain reflectometry provide new link-layer and physical tools for the effective troubleshooting of WDM-PONs. This article proposes an integrated troubleshooting box (ITB) for the effective combination of both physical and link-layer information into an effective and efficient set of management procedures for WDM-PONs. We show its applicability in a number of realistic troubleshooting scenarios, including failure situations involving either the feeder fiber, one of its branches, or even Ethernet links after the ONU.7application/pdfeng© 2014 IEEECarrier gradesEfficient setsEthernet linkEthernet oamManagement proceduresOptical network unitsOptical time domain reflectometryPhysical toolEthernetPassive optical networksOptical fiber devicesPassive optical networksWavelength division multiplexingOptical fiber testingOptical fibersWavelength division multiplexingOptical fibre LANOptical linksresearch articleÓpticaTelecomunicacioneshttps://dx.doi.org/10.1109/MCOM.2014.6736739open accessS72S13IEEE Communications Magazine52AR/0000014710