JUMPER, LC-ST, DUPLEX, MM, 62.5/125 m,3M

LC-ST Duplex Multimode Fiber Jumper Cable – 3 Meter, 62.5/125µm

The Jumper, LC-ST, Duplex, MM, 62.5/125µm, 3M is a hybrid fiber optic patch cord designed to bridge the gap between legacy and modern network equipment. With an LC connector on one end, an ST connector on the other end, a duplex (two-fiber) design, and a 3-meter (approximately 10 feet) length, this cable is ideal for connecting older switches, media converters, and patch panels with ST ports to newer equipment with LC ports. The 62.5/125µm core size was the original multimode standard and remains common in older installations, educational facilities, and government buildings. This hybrid jumper is an essential cable management accessory for organizations that are gradually migrating from legacy infrastructure to modern equipment while maintaining compatibility with existing network accessories and fiber plant.

LC and ST Connectors

This hybrid cable features two different connector types, each optimized for specific applications. The LC (Lucent Connector) is a small form factor connector with a push-pull latching mechanism that is widely used in modern data centers and high-density applications. Its compact size allows for twice the port density compared to SC or ST connectors. The ST (Straight Tip) connector features a bayonet-style twist-lock coupling that provides a secure, vibration-resistant connection commonly found on older network equipment, media converters, and industrial switches. Both connectors feature ceramic ferrules for precise fiber alignment and low signal loss. The duplex design combines two fibers (one transmit, one receive) in a single zip-cord jacket, simplifying cable runs and maintaining proper polarity across the hybrid connection.

62.5/125µm Multimode Performance

This cable uses 62.5/125µm multimode fiber (core/cladding diameter), which was the industry standard for decades and remains functional in many existing installations. While it offers lower bandwidth over distance compared to modern 50/125µm fiber, 62.5/125µm fiber is perfectly adequate for many applications including Fast Ethernet (100Base-FX) up to 2 kilometers, Gigabit Ethernet (1000Base-SX) up to 220 meters, and 10-Gigabit Ethernet (10GBase-SR) up to 33 meters. The 3-meter length is ideal for short connections between adjacent equipment racks, from a patch panel to active equipment, or connecting devices that are located near each other. Typical applications include connecting legacy ST-based backbone fibers to new LC-based distribution switches, patching between older and newer fiber panels during a technology refresh, and linking media converters with different port types.

Durable Construction and Easy Installation

The cable features a PVC (OFNR) jacket rated for indoor use, including riser applications between floors. It is flexible enough for routing through cable management trays, raceways, or under floors without kinking. The duplex design allows for easy polarity tracking, with the two fibers typically marked by A and B indicators. Installation is straightforward: insert the LC connector into a compatible port until it clicks, insert the ST connector into its port and twist to lock, ensure the transmit fiber connects to the receive port on each device (maintaining proper polarity across the hybrid connection), and secure the cable with hook-and-loop straps without over-tightening. In workspaces with headsets, phones, and other office accessories, fiber jumpers like this provide interference-free connectivity that is immune to electromagnetic noise.

Why Choose Hybrid LC-ST Jumpers

Hybrid jumpers are essential for organizations that are in the process of migrating from legacy to modern equipment. Rather than replacing all legacy equipment at once or using bulky adapters that add additional connection points and signal loss, a hybrid jumper provides a direct, low-loss connection between devices with different port types. This specific jumper is intended for organizations that still have 62.5/125µm fiber infrastructure with ST connectors but are adding or replacing equipment that uses LC connectors. The LC connector's small size allows for higher density on new equipment, while the ST connector maintains compatibility with the existing fiber plant. This approach allows for gradual network upgrades without stranding existing investments in fiber cabling.

Best Practices for Installation and Use

To get the most from your hybrid fiber jumper, keep both connector types clean by using a fiber optic cleaning pen or lint-free wipes with isopropyl alcohol before each connection. Pay special attention to polarity when using hybrid jumpers: ensure that the transmit fiber on the LC side connects to the receive fiber on the ST side, and vice versa. The duplex cable's A and B markings will help you maintain correct polarity. Avoid mixing 62.5/125µm with 50/125µm fiber on the same link, as the core size mismatch will cause significant signal loss. Do not exceed the minimum bend radius, which is typically 10-15 times the cable diameter. Use appropriate cable management hardware and protect connectors with dust caps when not in use. Label both ends of each jumper to identify cable runs and maintain polarity documentation.

Complementary Products for a Complete Migration Setup

To complete your network migration, pair this LC-ST jumper with LC fiber adapters, ST fiber adapters, fiber patch panels of both connector types, cable management rings, and cleaning accessories. For longer runs, consider bulk 62.5/125µm fiber cable with field-installable connectors. For connections to other hybrid combinations, explore our LC-SC, LC-LC, or ST-ST jumpers in various lengths. Explore our full range of network accessories, cable management accessories, and fiber optic solutions on FindHeadsets to support all your headsets, phones, and office technology infrastructure needs, whether legacy, modern, or somewhere in between.