3m SC to SC Single Mode Fiber Patch Cable, OS2 9/125 Duplex Corning, LSZH/OFNR, Yellow

The CableLeader FB134-96XX is an OS2 single mode duplex patch cable terminated with SC/UPC connectors on both ends. Inside the yellow zipcord jacket run two Corning 9/125 um G657A1 fibers, wired straight through for duplex transmit-and-receive links. The square-bodied SC push-pull format is standard on single mode patch panels, carrier ONT hardware, media converters, and building-entrance frames, making an all-SC cable the direct link where both devices expose SC ports.

Both ends carry duplex SC/UPC connectors — a 2.5 mm ferrule in a square housing that seats with a positive click and holds position under vibration. SC dominates older and carrier-supplied single mode equipment: ISP ONT units, OLT distribution frames, and media converters routinely present SC/UPC receptacles. Each ferrule is polished to UPC grade, correct for data links, and factory-tested to 0.30 dB max insertion loss and 55 dB min return loss at 1310/1550 nm.

The G657A1 fiber grade is the working difference between this cable and older single mode cordage. Rated bend insensitive, it tolerates the tight routing radii found in cable managers, vertical rings, and wall enclosures without the attenuation spikes standard G652D fiber shows under the same treatment. G657A1 remains fully compatible with G652D infrastructure, so this patch cable drops into existing OS2 structured cabling, splice trays, and outside-plant terminations without link-budget surprises.

The jacket is LSZH/OFNR rated under UL file E510298. Low-smoke zero-halogen material limits toxic emissions in enclosed equipment rooms and plenum-adjacent pathways, while the OFNR riser rating permits vertical runs between floors. The 2.0 mm x 4.1 mm duplex zipcord profile keeps each fiber in its own aramid-reinforced sub-unit while staying flexible for panel-side dressing. RoHS compliance covers restricted-substance procurement requirements.

Deployment concentrates in SC-terminated single mode plant. ISP and telecom installers patch OLT frames and ONT units inside fiber distribution frames; enterprise teams link SC horizontal cabling to SC-port switches and converters; and FTTH integrators complete data-side SC/UPC links at the customer premises. Where the downstream equipment is LC instead, a hybrid LC-SC cable is the correct choice; where GPON or RF video demands angled polish, an SC/APC version applies.

Compatibility & Ordering Information — FB134-96XX mates with any standards-compliant SC/UPC single mode port, including SC media converters and ONT units from TP-Link, Ubiquiti, and carrier-supplied hardware, plus SC ports on switches, transport gear, and adapter panels. The family is offered from 1 m through 10 m; select the variant covering the panel-to-equipment distance plus a service loop. For LC-to-SC links see the FB132-92XX family; for LC-to-LC links see the FB131-91XX family; SC/APC versions for GPON and RF applications are listed separately in the CableLeader fiber optic cables catalog.

Product Comparison: SC-SC vs LC-SC Single Mode Patch Cable

Both cables use identical Corning OS2 9/125 G657A1 fiber and UPC polish; the difference is the connector on the far end and the equipment each links. The table summarizes the decision:

Select the SC-SC version when both ports are SC.
Select the LC-SC version (FB132 family) when one port is LC and one is SC.

FAQ

What is the difference between SC-SC and LC-SC single mode cables?

An SC-SC cable is SC on both ends; an LC-SC cable is LC on one end and SC on the other. Both use the same OS2 9/125 fiber and perform identically — 0.30 dB max insertion loss per connector. Choose SC-SC when both ports are SC, such as panel-to-media-converter links; choose LC-SC when one device is LC.

Is this cable compatible with my ONT or media converter?

Yes, if the equipment has SC/UPC ports (blue). Both ends are SC/UPC, correct for data ONT ports, single mode media converters, and SC patch panels. If your carrier hardware uses SC/APC (green, angled polish, common in GPON/RF), you need an APC version instead — mating APC to UPC damages ferrules and causes high loss.

What do OS2 and 9/125 mean, and is this single or multimode?

This is single mode. OS2 is the standard designation for low-water-peak single mode cabling, and 9/125 describes the glass: a 9 um core inside a 125 um cladding carrying one light mode at 1310/1550 nm. Single mode spans kilometers; do not mix it with multimode SR optics or aqua OM3/OM4 cabling on the same link.

How do I connect an SC connector correctly?

Align the SC connector's key with the receptacle slot and push straight in until it clicks — the push-pull latch seats automatically. To remove, pull the outer housing back, do not tug the cable. Avoid touching the ferrule endface, and leave a small service loop so the connector is never under tension.

Which single mode cable should I buy if both my ports are SC?

Choose an SC-SC single mode cable like this one when both devices have SC/UPC ports — it links them directly without adapter couplers that add loss. If one device is LC, choose the LC-SC (FB132) family; if both are LC, choose the LC-LC (FB131) family. Match the polish: UPC for data, APC for GPON/RF.