SFP-10G-LR-S Cisco Transceiver

The Cisco SFP-10G-LR-S Transceiver is a high-performance 10 Gigabit Ethernet optical module designed for reliable, long-distance network connections over single-mode fiber. As part of Cisco’s S-Class optical transceiver portfolio, the SFP-10G-LR-S provides a practical solution for organizations that need stable 10Gbps connectivity without requiring the additional multi-protocol features found in some higher-tier Cisco optics. With a transmission distance of up to 10 kilometers, a nominal wavelength of 1310 nm, and an SFP+ form factor, this network module is well suited to enterprise networks, campus environments, data centers, aggregation links, and fiber connections between network equipment located in different buildings.

Cisco SFP-10G-LR-S Transceiver

The SFP-10G-LR-S is based on the 10GBASE-LR optical standard and operates over standard G.652 single-mode fiber (SMF). It provides a 10 Gigabit Ethernet connection while maintaining the compact, hot-swappable SFP+ design commonly used across Cisco networking platforms. The module uses a duplex LC fiber interface, allowing separate transmit and receive paths through a standard duplex single-mode fiber connection. Its optical system operates around the 1310 nm wavelength range and is engineered to provide reliable transmission over distances up to 10 km. This makes the Cisco SFP-10G-LR-S particularly useful when copper connections, DAC cables, or short-range multimode optics cannot cover the required distance.

Another important characteristic of the SFP-10G-LR-S is its S-Class positioning. Cisco developed S-Class optics primarily for common enterprise and data center Ethernet applications where advanced features are not required. The SFP 10G LR S therefore focuses on 10 Gigabit Ethernet connectivity rather than additional protocols such as Fibre Channel over Ethernet (FCoE). For standard 10GbE links, this can make the SFP-10G-LR-S a practical alternative to the regular SFP-10G-LR. Its combination of 10 km reach, single-mode fiber support, compact SFP+ design, and Cisco platform compatibility makes it a strong option for building dependable fiber uplinks and backbone connections.

Applications of the SFP-10G-LR-S

The SFP-10G-LR-S is commonly used wherever a high-speed 10GbE connection must extend beyond the practical limits of copper or multimode fiber. One typical application is connecting network switches between different floors or buildings within a campus. It can also be deployed between access, distribution, and core switches, depending on the network architecture and supported hardware.

Data centers may use SFP 10G LR S modules for long-distance switch-to-switch connections, while enterprise networks can use them to connect server rooms, network closets, or remote facilities through existing single-mode fiber infrastructure. Because the module supports distances of up to 10 km, it is also suitable for metropolitan or multi-building environments where two network endpoints are physically separated but still require a dedicated high-bandwidth Ethernet link.

SFP-10G-LR-S Connector and Interface

The Cisco SFP-10G-LR-S does not provide conventional Ethernet ports such as RJ45. Instead, it plugs directly into a compatible SFP+ slot on a Cisco switch, router, or other supported networking platform. On the optical side, the module uses a duplex LC connector. One fiber strand carries transmitted optical signals while the other carries received signals, so a standard duplex single-mode LC fiber cable is normally required. The module operates at 1310 nm and is designed for standard G.652 single-mode fiber. Before installation, it is important to verify that the network device supports the SFP-10G-LR-S and that the optical module at the opposite end uses a compatible wavelength, fiber type, and Ethernet standard.

Why Choose SFP-10G-LR-S for a 10GbE Fiber Link?

One of the main advantages of the SFP-10G-LR-S is that it provides significantly greater reach than short-range 10GBASE-SR optics. An SR module is intended primarily for multimode fiber and shorter data center or building links, whereas the SFP-10G-LR-S can transmit 10 Gigabit Ethernet up to 10 km over single-mode fiber.

This difference becomes important when designing a network across a large campus or connecting buildings. Instead of introducing additional switches or repeaters simply because of distance, network administrators can use an LR optical link to create a direct 10Gbps connection between compatible devices.

The SFP+ form factor also helps maintain high port density. Multiple SFP 10G LR S modules can be installed in compatible Cisco switches without requiring large external media converters. Since the transceiver is hot-swappable, installation and replacement can generally be performed without powering down the entire networking platform, subject to the operating procedures of the host device.

SFP-10G-LR-S Optical Power and Link Planning

Distance alone should not be the only consideration when designing a fiber connection with the SFP-10G-LR-S. Optical power budget, connector loss, splice loss, fiber quality, and patch-panel insertion loss can all affect link performance.

For the SFP 10G LR S, Cisco specifies transmit power between approximately -8.2 dBm and +0.5 dBm, while receiver specifications extend from a maximum of +0.5 dBm to a minimum of -14.4 dBm. These values provide the optical operating parameters engineers can use when calculating whether a proposed fiber path is suitable.

For shorter links, excessive received optical power should also be considered when designing an optical network. For longer links approaching 10 km, engineers should calculate the total loss introduced by the fiber, connectors, splices, and patch panels. Checking actual Tx and Rx optical levels through Digital Optical Monitoring, where supported by the host platform, can also help troubleshoot fiber attenuation and link-quality issues.

SFP-10G-LR-S vs Similar Cisco Transceivers

Cisco offers several 10GbE SFP+ optical modules designed for different distances and fiber environments. The most appropriate model depends primarily on fiber type, transmission distance, operating environment, and required network features.

The SFP-10G-LR and SFP-10G-LR-S are especially easy to confuse because both provide 10GBASE-LR connectivity at 1310 nm and support up to 10 km over standard single-mode fiber. The key consideration is feature support: SFP-10G-LR-S is an S-Class Ethernet-focused optic and does not support FCoE. Therefore, if the application is simply a standard 10 Gigabit Ethernet fiber connection, SFP-10G-LR-S can be an appropriate choice.

The SFP-10G-SR-S is better suited to shorter connections where multimode fiber is already installed, while the SFP-10G-ER-S is designed for significantly longer single-mode links of up to 40 km.

Technical Specifications of Cisco SFP-10G-LR-S

Benefits of Using an Original Cisco SFP-10G-LR-S

Using a Cisco optical transceiver in a supported Cisco platform can simplify network deployment and operational management. Compatibility between the host device and transceiver is particularly important in enterprise networks because the switch or router must correctly recognize the module and support its operating parameters.

The SFP-10G-LR-S also provides a straightforward migration path when an organization needs to upgrade an existing single-mode fiber connection to 10GbE. If suitable G.652 fiber is already installed between locations, the network may be upgraded without replacing the entire fiber infrastructure, provided the link budget and endpoints meet the required specifications.

What to Check Before Buying an SFP-10G-LR-S

Before purchasing an SFP-10G-LR-S, first verify that the Cisco switch or router has an SFP+ interface and officially supports the transceiver. An SFP+ module cannot simply be assumed to operate in every slot that physically looks similar.

The second consideration is fiber type. SFP-10G-LR-S is intended for single-mode fiber, so it should not be selected as a direct replacement for an SR transceiver used on multimode cabling without checking the fiber infrastructure.

Finally, confirm the required distance and features. If your connection is below 10 km and requires standard 10 Gigabit Ethernet over SMF, the SFP 10G LR S is a strong candidate. If the link requires FCoE or other functionality outside the S-Class feature set, another Cisco transceiver such as the SFP-10G-LR may be more appropriate.

FAQ About Cisco SFP-10G-LR-S

1. What is the maximum distance of SFP-10G-LR-S?

The SFP-10G-LR-S supports 10 Gigabit Ethernet connections up to 10 kilometers over standard G.652 single-mode fiber.

2. What wavelength does SFP-10G-LR-S use?

It uses a nominal optical wavelength of 1310 nm, with Cisco specifying an operating wavelength range of 1260 to 1355 nm.

3. Is SFP-10G-LR-S a single-mode or multimode transceiver?

It is designed for single-mode fiber (SMF).

4. What connector does SFP-10G-LR-S use?

The module uses a duplex LC optical connector.

5. Is SFP-10G-LR-S a 10Gbps module?

Yes. It is a 10GBASE-LR SFP+ transceiver designed for 10 Gigabit Ethernet connectivity.

6. What is the difference between SFP-10G-LR-S and SFP-10G-LR?

Both support 10GBASE-LR connections over single-mode fiber up to 10 km. However, SFP 10G LR S belongs to Cisco’s S-Class portfolio and does not support FCoE, while the regular SFP-10G-LR supports FCoE.

7. Can SFP-10G-LR-S be used for a 1 km connection?

Yes. A 1 km single-mode fiber link is within its maximum 10 km reach, assuming the optical link budget and other connection parameters are within specification.

8. Can SFP 10G LR S work over multimode fiber?

The module is specified for standard G.652 single-mode fiber. For conventional 10GbE multimode deployments, an SR-series transceiver is generally the appropriate option.

9. Is SFP-10G-LR-S hot-swappable?

Yes. Its SFP+ form factor supports hot-swappable installation in compatible networking equipment.

10. Does SFP-10G-LR-S support FCoE?

No. Cisco specifically states that SFP 10G LR S does not support Fibre Channel over Ethernet.

Buy Cisco SFP-10G-LR-S from ITMan

ITMan supplies the Cisco SFP-10G-LR-S Transceiver for businesses, data centers, network integrators, and IT environments requiring dependable 10GbE fiber connectivity. Whether you are building a new fiber backbone or upgrading an existing Cisco network, selecting the correct optical transceiver helps ensure reliable performance and compatibility.

If you are unsure whether the SFP 10G LR S is compatible with your Cisco switch or your existing fiber connection, you can contact ITMan with the device model and network requirements before ordering.

Conclusion

The Cisco SFP-10G-LR-S is a practical 10GBASE-LR optical transceiver for organizations that need high-speed Ethernet connectivity across single-mode fiber. With a maximum link distance of 10 km, 1310 nm wavelength, duplex LC interface, SFP+ form factor, and support for standard G.652 SMF, it is well suited to campus networks, enterprise backbones, data centers, and inter-building connections.

For applications focused specifically on standard 10 Gigabit Ethernet, the SFP-10G-LR-S offers the essential characteristics required for a reliable long-range fiber link without unnecessary protocol features. Available from ITMan, it is a suitable choice for upgrading or expanding Cisco-based 10GbE network infrastructure.