Panduit FHC39N-08H-10A HD Flex™ MPO-LC Fiber Cassette

The Panduit FHC39N-08H-10A is a 4-to-1 breakout fiber cassette engineered for high-density single-mode connectivity in structured datacenter cabling. This HD Flex™ cassette converts one 8-fiber MPO trunk interface into four duplex LC connections, enabling modular fiber deployment with OS2 9/125μm performance over distances up to 10 km at 10 Gb/s or 2 km at 40 Gb/s. Method A polarity follows TIA-568 straight-through pin assignments, simplifying trunk-to-equipment patching in spine-leaf and top-of-rack switch deployments. The cassette ships with integrated shutter-equipped LC adapters that block contamination when ports are unpopulated, reducing insertion loss variability and field cleaning labor. At 55 mm wide and 12 mm high, the polycarbonate housing fits HD Flex enclosures and standard 19-inch fiber panels, delivering 8-fiber connectivity in less than half the footprint of discrete bulkhead adapters.

Key Features

• MPO-to-4×LC Breakout Architecture: One 8-fiber MPO male interface fans out to four duplex LC adapters, consolidating trunk cable management and reducing patch-cord clutter in high-port-count installations.
• OS2 Single-Mode Fiber: 9/125 μm core/cladding diameter supports 10GBASE-LR, 40GBASE-LR4, and 100GBASE-LR4 transmission over extended distances, meeting datacenter backbone and inter-building link requirements.
• Method A Polarity: Straight-through key-up-to-key-up MPO pin mapping aligns with TIA-568-C.0 Annex A, ensuring plug-and-play compatibility with standard pre-terminated trunk assemblies and eliminating field re-termination.
• Integrated LC Shutter Adapters: Four blue duplex LC adapters feature spring-loaded shutters that close automatically when connectors are removed, blocking airborne particles and finger contact that cause insertion loss degradation.
• High-Density Modular Design: Cassette form factor allows field-swappable configuration changes—swap MPO-LC cassettes for MPO-MPO or alternate fiber counts without rewiring trunk cables or replacing enclosures.
• Black Housing and Connectors: Color-coded black polycarbonate shell and MPO boot provide instant single-mode identification, reducing cross-connection errors in mixed multi-mode/single-mode environments.
• Compact 55 mm Width: Four-port cassette occupies the same panel space as two traditional duplex SC adapters, increasing port density by 2× in retrofit applications constrained by existing rack real estate.
• Polycarbonate Construction: UL 94 V-0 flame-rated engineering thermoplastic resists impact damage during installation and provides dimensional stability across -40°C to +85°C operating range.

The FHC39N-08H-10A addresses structured cabling challenges in disaggregated datacenter architectures where switch-to-server leaf connections and spine uplinks demand repeatable low-loss performance with minimal installation time. Pre-terminated MPO trunk cables ship from the factory with insertion loss tested and documented, eliminating field fusion splicing and the associated labor, equipment, and certification costs. When combined with HD Flex enclosures, installers pull a single 8-fiber or 12-fiber trunk from the MDA to each rack, then break out connections at the cassette level—changing a 96-fiber backbone deployment from a two-week fusion splice project to a same-day plug-in task. Method A polarity ensures the transmit fiber on the MPO trunk's pin 1 reaches the LC adapter's transmit port without crossing, matching the pin assignment convention used by Cisco, Juniper, Arista, and Dell switch modules. The integrated LC shutters remain closed until a patch cord is inserted, preventing dust accumulation inside the ceramic ferrule bore—the primary cause of insertion loss above 0.5 dB in production networks. In facilities with positive-pressure cooling or dusty OT environments, shutter adapters cut cleaning cycles from quarterly to annual, reducing truck rolls and downtime windows.

Deployment typically follows a two-tier model: HD Flex enclosures mount in the main distribution area or end-of-row cabinet, housing 8 to 12 cassettes per 1U panel for 32 to 48 LC connections. Installers route factory pre-terminated 8-fiber or 12-fiber MPO trunk bundles through overhead ladder rack or underfloor conduit, terminate the MPO ends into cassette rear interfaces, and label the front LC ports per TIA-606-B. At the equipment side, standard duplex LC patch cords (1–3 meters) connect cassette ports to switch SFP+ or QSFP28 transceivers, eliminating the 15-meter minimum bend radius and trunk-handling challenges of direct MPO-to-transceiver patching. This architecture supports pay-as-you-grow expansion: initial deployment might populate 4 cassettes (16 LC ports) in a 12-position panel, with the remaining 8 slots reserved for future server additions—each new cassette adds 4 connections in under 60 seconds without disrupting live circuits. The OS2 fiber spec ensures compliance with 10 km reach requirements for inter-building links and provides 4× margin over the 300-meter typical reach in intra-building horizontal runs, future-proofing installations for 25G/100G transceiver upgrades that assume 2 dB total channel loss budget.

The FHC39N-08H-10A ships in cartons of 10 cassettes, each individually packaged with the MPO interface and four LC adapters pre-installed and dust caps applied to all ports. The cassette latches into HD Flex panels without tools, and the black MPO connector keys into the rear housing with audible click confirmation, preventing incomplete seating that causes intermittent link loss. The blue LC adapters accept both PC and UPC polish connectors, though OS2 deployments standardize on UPC (ultra-physical contact) to meet the <0.35 dB insertion loss target for 10GBASE-LR links. For installations requiring APC (angled physical contact) connectors to suppress back-reflection in DWDM or long-haul applications, Panduit offers APC-equipped variants under separate model numbers—consult factory documentation to match cassette polarity, connector angle, and fiber count to your trunk cable specification. This cassette is not compatible with OM3 or OM4 multi-mode fiber; for 40G/100G SR4 multi-mode applications, specify Panduit's OM4-rated MPO-LC cassettes with aqua-colored housing.