SC to ST Fiber Patch Cable - Single Mode OS2 9/125μm Duplex

Some lengths are marked down to clear stock. Marked-down lengths are final sale and won't be restocked: orders can't be cancelled once placed, and the cord isn't eligible for return, exchange, or refund. Please check the length and the specifications below before you order, and get in touch first if you have any questions.

SC and ST are the two connectors of the older fiber plant, and a lot of buildings have both: ST on the enclosures and media converters from the first fiber install, SC on the patch panels and equipment that came later. This cord joins them, with a pair of SC/UPC push-pull connectors on one end and a pair of ST/UPC bayonet connectors on the other, so an SC panel or transceiver can reach an ST port or panel directly, without a hybrid adapter or re-terminating either end.

It's OS2 single-mode fiber, 9/125 µm, in a duplex configuration for a transmit and receive pair. Each cord is tested and the end-faces are checked by interferometer before it ships.

Features

• SC/UPC to ST/UPC. Push-pull SC on one end, twist-lock ST bayonet on the other, both flat-polished UPC.
• OS2 single-mode, 9/125 µm. For 1310 and 1550 nm links, from a patch panel jumper to a campus or metro span.
• Duplex. Two fibers for a matched transmit and receive pair.
• Low insertion loss. 0.15 dB typical and 0.30 dB maximum per connector.
• Return loss 50 dB or better, the standard UPC figure.
• 2.5 mm ceramic ferrules on both ends, checked by 3D interferometry for end-face geometry.
• Bayonet ST coupling. Push, quarter-turn, and it's locked; it won't pull out of a panel by accident.
• ETL Listed for the US and Canada (Intertek 4009521), and RoHS compliant.
• Twelve lengths from 1 to 30 m.

Where It Fits

It suits connecting an SC patch panel or media converter to an existing ST enclosure, linking older switches and converters with ST ports to SC equipment, building-to-building links terminated on ST at one end and SC at the other, phased upgrades where the fiber plant stays on ST while the panels move to SC, and any single-mode link between an SC port and an ST port.

Good to Know

Both ends are UPC, so this cord is for blue SC ports and standard ST ports; if the SC side is a green SC/APC port, on an FTTH outlet or PON gear for example, you need a different cord. The two ST connectors aren't keyed to each other the way a duplex SC clip is, so polarity is set by which ST plug goes into which port: if the link doesn't come up, swap the two ST ends and try again before troubleshooting anything else. Both ferrules are 2.5 mm, so one 2.5 mm one-click cleaner covers both ends; keep dust caps on until the moment you plug in, and clean both the connector and the port before mating, because a fingerprint on a single-mode ferrule costs more than the whole cord's loss budget. To seat an ST, line up the key on the plug with the slot on the port, push in against the spring, and turn clockwise until it stops; a half-seated ST is the most common cause of a "bad" fiber link. If the equipment side is LC rather than SC, look at the LC/UPC to ST/UPC cord. For runs longer than 30 m, or where the cord will be pulled through a tray or conduit, ask about a 3.0 mm jacket or an OFNR-rated cable.

Specifications