25m MTP to MTP Trunk Fiber Cable, OS2 12 Fiber Single Mode Type A, MTP/APC Female, Plenum OFNP, Yellow

The CableLeader FB125-9BXX is an OS2 single mode MTP trunk cable carrying 12 Corning SMF-28 Ultra fibers between two MTP/APC connectors. One trunk replaces six duplex patch cables in the backbone, collapsing pathway congestion in cable trays and conduits while keeping every fiber factory-terminated and tested. The 3.0 mm single-tube yellow jacket keeps the outside diameter small enough for high-density routing through vertical managers and overhead raceway.

Both ends are US Conec MTP Elite female (unpinned) connectors with green housings, the color code identifying APC polish. The 8-degree angled ferrule directs reflected light out of the transmission path, which holds return loss at 60 dB minimum — the level single mode backbone links demand, since back-reflection budgets tighten as link counts and speeds grow. Insertion loss is limited to 0.35 dB maximum per connector, verified on every assembly at both 1310 nm and 1550 nm.

Polarity is Type A, the straight-through scheme in which fiber position 1 at one connector arrives at position 1 at the other. Type A trunks are the workhorse of TIA-568 Method A structured cabling, where polarity is corrected at the cassette or patch cord stage rather than inside the trunk. Both connectors are keyed, and the key-up to key-down adapter orientation completes the standard Type A mating.

APC and UPC are not interchangeable: the green-housing APC connectors on this trunk mate only with APC ports and cassettes, never with blue flat-polish UPC hardware. Forcing an APC ferrule against a UPC ferrule leaves an air gap and can permanently damage both end-faces. The OFNP plenum listing under UL file E489140, plus RoHS compliance, clears the cable for air-handling spaces and every lower fire-rating class.

The fiber itself is Corning SMF-28 Ultra with G657A1 bend tolerance, so the trunk withstands the tight routing of loaded trays and cabinet entries without attenuation penalties, while staying fully compatible with conventional G652D plant. Installers pull the trunk between zones, land each end in an MTP adapter panel or cassette, and the 12-fiber backbone is live without field termination or splicing.

Compatibility & Ordering Information — FB125-9BXX mates with pinned MTP/MPO APC connectors through key-up/key-down adapters, and feeds single mode MTP-LC cassettes, MTP adapter panels, and fiber enclosures from major structured cabling systems. Confirm gender before ordering: both ends are female and pair with pinned cassette or trunk connectors. The family is offered in lengths from 5 m through 30 m. For direct transceiver-to-transceiver links requiring flipped polarity, see the Type B trunk family FB127-9BXX; for MTP-to-LC fan-out, see the FB126-9CXX single mode breakout.

Product Comparison: Single Mode OS2 Trunk vs Multimode OM4 Trunk

Both are 12-fiber MTP trunk constructions; the fiber class decides reach, optics cost, and which transceivers the backbone can serve. The table summarizes the decision:

Select the OS2 single mode trunk for long backbone runs and single mode optics — it will not become the limiting factor as speeds rise.
Select an OM4 multimode trunk when links stay short and SR4-class optics keep the electronics budget down. The fiber class must match the transceivers on both ends.

FAQ

What is the difference between Type A and Type B MTP trunk cables?

Type A is straight-through: fiber position 1 at one end arrives at position 1 at the other. Type B is flipped: position 1 arrives at position 12. Type A trunks suit structured cabling where cassettes or patch cords handle the polarity correction; Type B trunks connect two parallel-optics transceivers directly. This cable is Type A — pick it for cassette-based backbone, not for direct transceiver-to-transceiver links.

Is this trunk compatible with MTP-LC cassettes?

Yes, provided the cassette side is single mode APC with pinned (male) MTP connectors. This trunk is female on both ends, which is the standard gender for trunks feeding pinned cassette ports through key-up/key-down adapters. Do not pair it with UPC cassettes: the green APC connectors mate only with APC hardware.

What do 12 fiber and OS2 mean for this cable?

The trunk carries 12 individual single mode fibers — six duplex channels — inside one 3.0 mm jacket, terminated in a single 12-fiber MTP connector at each end. OS2 designates low-water-peak single mode cabling operating at 1310/1550 nm, the fiber class used for long backbone runs. The glass is Corning SMF-28 Ultra with G657A1 bend tolerance.

How do I install an MTP trunk between two cassettes?

Pull the trunk through the pathway using its packaging protection, then push each MTP connector into the cassette or adapter until it clicks — termination is factory-done, so no splicing or polishing is needed. Match three things at each end: APC to APC polish, female cable to pinned cassette connector, and key-up to key-down adapter orientation for Type A polarity.

Which trunk should I choose, single mode OS2 or multimode OM4?

Choose OS2 single mode when links run long distances between rooms or buildings, or when the electronics use single mode optics such as PSM4 or LR4. Choose OM4 multimode when links stay within a data hall and the transceivers are SR4-class, which typically cost less. The fiber must match the optics on both ends — single mode and multimode are never interchangeable on the same link.