Panduit FDCSA-24-10ASLH FlexCore 24-Fiber OM4+ LC/MPO-12 Cassette
The Panduit FDCSA-24-10ASLH is a front-access FlexCore ODF fiber cassette housing 24 Signature Core OM4+ multimode fibers in a breakout configuration: 12 LC duplex ports on the front panel transitioning to two MPO-12 male trunk connectors on the rear. Configured for Method A polarity (straight-through array mapping) with left-hand orientation, this cassette is engineered for ultra-low insertion loss and supports 40GBASE-SR4 and 100GBASE-SR10 Ethernet in spine-leaf data center architectures. The left-hand variant routes the MPO trunk connectors toward the left side of the ODF enclosure, critical for structured cable management in tightly packed rack environments where trunk routing direction determines whether you achieve clean service loops or create kink risk at bend-radius limits.
Key Features
- 24 Signature Core OM4+ fibers (50/125 µm) rated for 550-meter 10G, 150-meter 40G, and 100-meter 100G reach
- 12 LC duplex ports on front panel for patch cord access; 2x MPO-12 male connectors on rear for trunk integration
- Method A polarity (straight-through): fiber 1 on MPO pin 1 maps to fiber 1 on LC port 1 transmit — pair with Method B trunk cables or Method A cassettes at far end for correct TX/RX pairing
- Left-hand orientation: MPO trunks exit toward left edge of cassette, matching left-to-right trunk routing in FlexCore ODF frames
- Ultra-low insertion loss specification (≤0.35 dB typical per mated pair) minimizes optical budget consumption in multi-tier leaf-spine fabrics
- Black polycarbonate housing with numbered LC ports for fast identification during adds/moves/changes
- Front-access design: all LC connectors serviceable without removing cassette from ODF frame, reducing downtime during MAC work
- Complies with ISO/IEC 11801, ANSI/TIA-568-C.3, TIA-604-5 (FOCIS-5), TIA-604-10 (FOCIS-10), IEEE 802.3, ANSI T11.2 (Fibre Channel), and RoHS 2002/95/EC
OM4+ Signature Core fiber extends the useful life of multimode infrastructure by supporting both legacy 1G/10G applications and current 40G/100G speeds without requiring retermination. The 50 µm core diameter and optimized refractive index profile deliver effective modal bandwidth exceeding 4700 MHz·km at 850 nm, which translates to 150-meter 40GBASE-SR4 reach using MPO connectivity — adequate for most intra-building data center runs and sufficient for two-tier spine-leaf topologies in racks separated by hot/cold aisle configurations. The LC duplex breakout on the front panel provides backward compatibility with existing 10GBASE-SR server and switch ports, so you can deploy this cassette in a mixed-speed environment and light only the fiber pairs you need today while reserving the remainder for future 40G uplinks or storage fabric expansion. The ultra-low insertion loss specification is critical in 100G SR10 links, where IEEE 802.3ba allocates just 1.9 dB total channel loss; typical 0.35 dB IL per connection leaves budget for four mated pairs plus 130 meters of OM4 fiber, but sloppy connectors pushing 0.5 dB would cut your reach to under 100 meters. Panduit's factory-terminated MPO connectors use precision ferrules with <0.5° end-face angle and <50 nm surface finish, tested to IEC 61300-3-35 interference requirements, ensuring you stay within optical budget even in worst-case tolerance stack-ups across six cassette hops in a storage replication link.
The Method A polarity scheme (also called "straight-through" or "key-up-to-key-up") maps MPO pin 1 to LC port 1 transmit, pin 2 to port 1 receive, pin 3 to port 2 transmit, and so on in sequential order. This is the dominant polarity method in enterprise data centers because it simplifies troubleshooting: if you're lighting fiber pair 5 (pins 9 and 10 on the MPO array), you know you're terminating on LC port 5 without consulting a crossover table. To achieve correct transmit-to-receive pairing between two switches, you pair a Method A cassette at one end with a Method B trunk cable (which swaps pin 1↔12, 2↔11, etc. inside the cable assembly) or with another Method A cassette if your trunk cable is also Method A and you're using a crossover patch panel. The left-hand orientation refers to the physical position of the MPO trunk connectors on the rear of the cassette: they exit toward the left edge when the cassette is seated in a FlexCore ODF frame with LC ports facing you. This matters in high-density ODF frames holding eight or twelve cassettes side-by-side; if your trunk cable bundle enters the frame from the left side of the rack, left-hand cassettes in the leftmost slots give you the shortest, straightest trunk routing without forcing the MPO cables to cross over adjacent cassettes. Conversely, right-hand cassettes (like the FDCSA-24-10ASRH) suit rightmost slots in the same scenario. Mixing orientations within a frame is common: left-hand for slots 1-6, right-hand for slots 7-12, keeping all trunk cables pointing toward their respective entry points and avoiding the cable congestion that kills airflow in 45U racks running 15 kW per cabinet.
The cassette measures 292.8 mm wide by 11.7 mm high (1U height profile), fitting Panduit FlexCore ODF and OSF enclosures designed for front-access horizontal cable management. The polycarbonate shell is UL 94 V-0 rated for flame resistance and ships as a complete plug-and-play module: MPO trunks and LC adapters are pre-installed and factory-tested, so deployment is insert-cassette-and-plug-trunk rather than field-terminate-and-pray. Each LC adapter port is labeled 1 through 12 on the front panel; if you follow Panduit's recommended labeling scheme (cassette letter + port number, e.g., "C-7" for cassette C port 7), you can trace a fiber path from switch port to server NIC in under 30 seconds using a visual fault locator instead of burning an hour with a tone-and-probe kit. The two MPO-12 connectors on the rear are male (pins protruding), so they mate with female MPO trunk cables (pins recessed) — the industry-standard trunk configuration that protects the more fragile pin ferrule inside the cable connector rather than exposing it on the fixed cassette. If your existing trunk infrastructure uses male-to-male polarity-reversing cables (common in Cisco ACI leaf-spine fabrics), you'll need female-to-female MPO adapter couplers at the cassette interface or a one-time trunk cable swap to female; plan for this in your BOM if you're integrating into a multi-vendor environment where trunk polarity isn't standardized.
This cassette is RoHS 2002/95/EC compliant (lead-free, mercury-free, cadmium-free) and meets TIA-568-C.3 transmission performance requirements for OM4 multimode fiber, making it suitable for projects with government sustainability mandates or LEED certification requirements that specify low-halogen materials. The 10-pack carton quantity reflects data center deployment scale: a single 42U rack with two spine switches (each with 4x 40G uplinks) and 20 leaf switches (each with 2x 40G uplinks to spine, 16x 10G server downlinks) requires 24 spine uplink fibers + 40 leaf uplink fibers + 320 server downlink fibers = 384 fibers total, or sixteen 24-fiber cassettes — two cartons. Buying in 10-packs reduces per-unit cost and ensures you have spares on hand when a cassette takes a forklift strike during a rack move or when you need to add three servers on Saturday and discover your last cassette only has four unused LC ports. The FlexCore platform's front-access design means you can add or replace cassettes without disrupting adjacent modules or removing the ODF frame from the rack, a critical feature in 24/7 environments where "maintenance window" means "3 AM on Sunday" and your SLA allows 15 minutes of downtime per quarter.
