EFB-Elektronik LC-LC Duplex Fiber Optic Patch Cable, OS2 Single-Mode 9/125, 5m, LSZH 2.0mm, Yellow

The EFB-Elektronik O0350.5 is a 5 m duplex LC-to-LC single-mode OS2 (9/125 µm) fibre patch cable with a 2.0 mm LSZH jacket in yellow, for connecting LR/LX single-mode optics in switches, routers, media converters and patch panels.

Duplex means two fibres in one cord: one transmits and one receives, which is what almost every SFP module and media converter expects. The LSZH (Low Smoke Zero Halogen) jacket gives off little smoke and no halogen gases in a fire, which is why it is the usual choice for offices, server rooms and shared spaces.

• 1 × duplex fibre patch cable LC-LC, 5 m
• 2 × duplex clips
• 1 × individual measurement report
• 1 × information sheet
• Resealable EFB poly bag

• Single-mode OS2 is what long-reach optics expect: SFP, SFP+, SFP28 and QSFP modules marked LX, LR, ER or ZR (1310/1550 nm). The distance limit comes from the transceiver, not from this 5 m cord.
• UPC polish (flat end face): it mates with standard UPC single-mode ports and couplers, which is what most data and enterprise SFP optics use.
• LC: the small-form-factor connector used by SFP, SFP+, SFP28 and QSFP transceivers and most modern patch panels
• Colour code: yellow is the usual jacket colour for single-mode fibre, so the run is easy to tell apart in a shared rack.
• Handling: keep the dust caps on until you plug in, clean the end faces before mating, and route the cable without sharp bends or tight ties — most "dead" fibre links are a dirty connector or a kinked cord, not a faulty cable.

• Multimode SR/SX transceivers (850 nm) — they need OM3/OM4 multimode cable; single-mode cable will not give a reliable link with them.
• APC ports or couplers (green, 8° angled) — UPC and APC end faces must never be mated: it adds heavy loss and can damage both end faces.
• Copper RJ45 ports — fibre needs an optical transceiver or a media converter at each end.