StarTech SMDOS2LCLC20M 20M LC to LC OS2 Single-Mode Fiber Patch Cable

Overview

The StarTech SMDOS2LCLC20M is a 20-meter (65.6 ft) LC to LC single-mode OS2 fiber patch cable rated for up to 100Gbps — a practical backbone run for structured cabling environments, data centers, and security infrastructure where copper simply can't cover the distance without signal degradation. With a 9/125µm fiber core, UPC-polished connectors, and a Low Smoke Zero Halogen (LSZH) jacket, this cable is built for installations that demand both performance and compliance. If you're linking NVRs to core switches, interconnecting IDF-to-MDF runs, or extending fiber between security closets, this is the cable to reach for when the run hits the 20-meter mark.

Key Features

• 100Gbps Maximum Data Rate: OS2 single-mode fiber supports speeds up to 100Gbps over the full 20-meter run — future-proofs your backbone against bandwidth growth as camera counts and resolution increase. You won't be re-pulling cable because you outgrew the medium.
• 9/125µm OS2 Single-Mode Fiber: The 9µm core is the right choice for long-distance, high-bandwidth runs. Unlike OM3/OM4 multimode, OS2 uses a laser light source that travels with far less dispersion, meaning reliable signal integrity over distances that would degrade multimode links.
• 0.3dB Insertion Loss: Low insertion loss keeps your optical power budget in check — critical when you're daisy-chaining patch panels or aggregating multiple fiber runs through breakout cassettes. Every fraction of a dB you save at the connector is headroom preserved for the actual fiber span.
• 55dB Return Loss (UPC Polish): UPC (Ultra Physical Contact) polishing delivers a 55dB return loss, which means reflected signal is attenuated to a negligible level. This matters for high-speed transceivers that are sensitive to back-reflection — it protects transceiver longevity and prevents link instability in 10G/25G/100G environments.
• Wavelength Range 1260nm–1625nm: Compatible with the full OS2 operating wavelength spectrum (O, E, S, C, L bands), so this cable works with a wide range of SFP, SFP+, SFP28, and QSFP28 transceivers without wavelength mismatch concerns.
• LSZH (Low Smoke Zero Halogen) Jacket: The 2mm OD LSZH jacket meets fire safety requirements for plenum and riser spaces where cable bundles are common. In a fire, LSZH jackets don't release the toxic halogen gases that PVC jackets do — a code requirement in many commercial building installations and a specification that matters to facilities managers and AHJs.
• Operating Range -20°C to 60°C: Handles the thermal range of most indoor telecom rooms, security closets, and equipment rooms. Not rated for outdoor direct burial or extreme cold exposure, but fully adequate for the controlled-environment runs this cable is designed for.
• Compact 2mm Cable OD: The slim 2mm outer diameter keeps routing clean in high-density patch panels and cable managers — easier to bend around corners, easier to dress in tight racks, and less bulk when running multiple cables in a shared tray.

Integration and Compatibility

The SMDOS2LCLC20M terminates in standard LC duplex connectors on both ends, compatible with the LC ports found on virtually all enterprise SFP/SFP+/SFP28 transceivers from Cisco, Juniper, Arista, HPE, and others. The OS2 single-mode designation pairs with single-mode transceivers only — do not use this cable with multimode SFPs (OM1/OM2/OM3/OM4 transceivers), as core size mismatch will produce unacceptable insertion loss. Verify that both endpoints are equipped with single-mode LC transceivers before deploying. The 1260–1625nm wavelength range accommodates CWDM and DWDM applications where wavelength-specific transceivers are in use, making this cable usable in multiplexed fiber architectures as well as point-to-point links. For network switch uplink runs or connections within a IP camera backbone, this cable handles the fiber segment between devices cleanly. If you're planning structured fiber runs, review our fiber optic cable category for companion lengths and connector types. For the switching infrastructure on either end, the PoE switch lineup covers the access-layer devices that feed those fiber uplinks.

Frequently Asked Questions

Q: Can the SMDOS2LCLC20M be used with multimode (OM3/OM4) transceivers?

A: No. This is an OS2 single-mode cable with a 9/125µm fiber core. Multimode transceivers use a 50µm or 62.5µm core and a different light source. Mixing them causes severe insertion loss and link failure. Always match OS2 cable with single-mode LC transceivers only.

Q: What connectors are on each end of this cable?

A: Both ends terminate in LC UPC (Ultra Physical Contact) connectors. The UPC polish provides a 55dB return loss, which is appropriate for high-speed data links up to 100Gbps.

Q: Is the LSZH jacket suitable for plenum or riser installation?

A: LSZH (Low Smoke Zero Halogen) reduces toxic gas emission in a fire and is required in many commercial and institutional installations. Always verify your local building code and AHJ requirements — LSZH does not automatically equate to a UL-listed plenum (CMP) or riser (CMR) rating. Confirm code compliance for your specific installation environment.

Q: What is the maximum data rate supported by this cable?

A: The SMDOS2LCLC20M supports a maximum data transfer rate of 100Gbps, making it compatible with 1G, 10G, 25G, 40G, and 100G transceiver speeds over this 20-meter run.

Q: What is the operating temperature range for this cable?

A: The operating temperature range is -20°C to 60°C (-4°F to 140°F), which covers standard indoor telecom room and security closet environments. It is not rated for outdoor or extreme cold applications.

Q: What is the cable outer diameter and how does it affect installation in dense patch environments?

A: The cable OD is 2mm. This slim profile makes it easier to route through high-density patch panels, cable managers, and tight conduit runs compared to thicker 3mm jacketed cables, with less strain on adjacent connectors.

James Everett

The SMDOS2LCLC20M is the cable I reach for when a run is too long for copper but short enough that the 20-meter LC-to-LC span covers it cleanly — particularly in IDF-to-patch-panel segments within a security or enterprise network closet. The 0.3dB insertion loss spec is the number that matters most here: at that level, you're not eating into optical power budgets on high-speed transceivers, and you're not stacking loss across a multi-segment fiber path.

Technical Highlights:

• 100Gbps Rated: OS2 single-mode at 9/125µm supports 100G transport — this cable won't be the limiting factor if you upgrade transceivers from 10G to 25G or 100G down the line.
• 55dB Return Loss (UPC): UPC polish at 55dB return loss is the right spec for standard single-mode links; it keeps back-reflection from destabilizing laser transceivers, which is a real concern at 10G and above.
• LSZH 2mm Jacket: The slim 2mm OD LSZH jacket satisfies low-toxicity fire safety requirements while keeping cable bundles manageable in rack environments — both a compliance checkbox and a practical installation advantage.

Deployment Considerations:

• Confirm both endpoint devices are equipped with OS2 single-mode LC transceivers before pulling this cable — the 9/125µm core is incompatible with OM3/OM4 multimode ports, and the mismatch won't always produce an obvious error, just a degraded or failed link.
• The humidity rating of 40–70% RH means this cable is calibrated for controlled indoor environments; avoid installing it in spaces with condensation risk or wide humidity swings without a protective conduit or enclosure.

For a data center or security operations center where fiber runs between IDF patch panels and core aggregation switches are landing in the 15–25 meter range, the SMDOS2LCLC20M is a clean, compliant choice — specifically where LSZH is a code requirement and 100G-readiness is a planning consideration.