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    EFM Repeaters

    Now in their sixth generation, Actelis® XR239 EFM Repeaters are the world’s first standards-based and most widely deployed 2-pair repeaters for 2Base-TL Ethernet in the First Mile (EFM) systems.

    Used with Actelis’ Ethernet over copper equipment, XR239 EFM Repeaters extend the reach of high-capacity Ethernet to cover over 98% of loop lengths. Actelis’ repeaters can be linked together and used to extend the reach of carrier Ethernet over copper services beyond 100Kft (19 miles, or more than 30km) using 0.5mm (AWG 24) cable.

    Actelis’ Ethernet over copper equipment already delivers the best performance over bonded EFM copper links. Our patented, award- winning EFMplus™ technology uses advanced signal processing to obtain the greatest rate, reach and reliability performance over voice- grade copper cabling. Actelis’ EFMplus delivers symmetrical service up to 100Mbps using 8-pair bonded links in excess of one mile, or 1.6km. Actelis’ XR239 EFM Repeaters extend the reach of EFM services by regenerating the signal between the carrier’s central office and customer premises. Supporting higher rates, the XR239 EFM Repeaters extend the distance to over 9.5 miles, or 15km, enabling more than 10Mbps per pair.


    Actelis’ XR239 EFM Repeaters are compliant with IEEE 802.3ah EFM standards as well as global and regional spectral requirements, including the ANSI T1.417-2003 standard for Spectrum Management for Loop Transmission Systems by Telcordia. Actelis’ XR239SE Repeater supports Dynamic Spectral Shaping (DSS) to ensure that it can be used in carrier EFM networks safely and reliably to significantly extend the reach of carrier Ethernet services and minimize any spectral interference well below regional spectral requirements.

    Environmentally Hardened for Outside Plant or Indoor Use
    Actelis’ XR239 EFM Repeaters are designed for deployment in outside plant or indoors. They occupy a single slot in any industry-standard 239 mechanics enclosure or common European carrier-grade enclosures, so the repeater can be deployed in existing electrical facilities. For outside plant deployments, Actelis’ XR239 EFM Repeaters come in an environmentally hardened case and support a variety of field installations, including cabinet, pole and building mounts. In these installation scenarios, the repeaters are line-powered from a remote PFU (Power Feeding Unit) directly connected to either an Actelis ML2300 or ML230 aggregation platform or ML600 EAD, and have no additional electrical or environmental requirements.

    The new XR239 Repeaters lower OpEx by simplifying and reducing installation time, especially in dual-side feeding configurations where it eliminates the need to rewire the enclosures being fed from the CPE side of the link, using a single type of XR239 product.

    Power Feeding Units
    Actelis’ new XR239 EFM Repeaters are remotely powered from a PFU-8D Power Feeding Unit. While feeding a span from a single side, Actelis’ PFU-8D supplies power up to 4 repeaters in a span across 8 pairs for a total of 16 repeaters. The PFU-8D can also feed spans from both sides (dual-side feeding), doubling the amount of repeaters per span, and as a result, the entire reach of the span.

    The PFU-8D offers improved performance as well as it is designed to support future single side Dynamic Rate Boost (DRB) functionality for further enhancing the XR239 links rate and reach performance.

    The PFU-8D is UL and NEBS Level 3 approved, meeting the most stringent carrier environmental and safety requirements. The PFU units can be attached to any Actelis ML600 system feeding up to 8 loops, and to any MLU-32 or MLU-64 front or rear access based system (ML2300, ML230) with the ability to concatenate up to 16 PFU-8 units (feeding up to 128 loops) per system.

    Operations, Administration and Maintenance (OAM) Features
    Extensive troubleshooting capabilities in Actelis’ MetaASSIST™ View topology provides simple troubleshooting and fault isolation in repeater links, including the option to perform loopbacks on a remote XR239 copper pair. Actelis’ XR239 EFM Repeaters fully support ITU-T G.991.2 Performance Monitoring and are transparent to the 802.3ah OAM and 991.2 EOC messages, including support for the OAM loopback, Remote Fault Indication (RFI) and Dying Gasp.

    XR239 EFM Repeater Highlights

      • For IEEE 802.3ah Ethernet in the First Mile (EFM) 2 Base-TL systems
      • Covers over 98% of loop lengths
      • Extend service reach over 25 miles (40km)
      • Delivers best performance over bonded EFM copper pairs
      • 45 Mbps per 8 pairs for over 10 miles (50kft/15km)
      • Fully standard and spectrally compliant, including proven compliance with ANSI T1.417-2003 standard
      • Environmentally hardened
      • Transparently forwards EFM OAM messages between CPE and CO equipment