What is SFP-10G-SR, SFP-10G-SR-S, SFP-10G-SR-X?

SFP-10G-SR, SFP-10G-SR-S, and SFP-10G-SR-X are SFP+ transceivers designed for 10GBASE-SR connections. They share similar product descriptions and are frequently used in Cisco switches and other networking equipment for very short reach applications. However, selecting the right 10G SFP+ SR module can be confusing for IT managers. Which option is the best fit? What are the similarities? And are there any differences between these 10G SFP+ SR modules?

What is SFP-10G-SR?

SFP-10G-SR is a designation commonly associated with Cisco. It refers to a 10GBASE-SR SFP+ Module designed to support a link length of up to 26m on standard Fiber Distributed Data Interface (FDDI)-grade Multimode Fiber (MMF). This module serves as a hot-swappable input/output device, enabling a 10 Gigabit Ethernet port to establish a connection with a fiber optic network. Additionally, SFP-10G-SR is utilized as a replacement model for compatible 10GBase-SR SFP+ Transceivers, which offer similar function and performance and are provided by various third-party suppliers and stores.

What is SFP-10G-SR-S?

Similar to SFP-10G-SR, SFP-10G-SR-S serves as a part number for Cisco’s S-Class 10GBASE-SR SFP+ Module. The primary distinction between the two lies in their features. Cisco’s S-class optics is a cost-effective option tailored for 10G and 40G applications in enterprise and data center settings. This class is particularly suitable for non-temperature controlled environments, such as rugged/industrial (RGD) setups, optics on platforms requiring an extended operating temperature range (EXT), and those needing TAA compliance.

Another significant difference is the pricing. SFP-10G-SR-S comes with an appealing price point due to the omission of several non-essential features present in SFP-10G-SR.

Furthermore, SFP-10G-SR-S is utilized as a replacement model for compatible low-cost 10GBase-SR SFP+ Transceivers, offering similar function and performance. These transceivers are provided by various third-party vendors and suppliers and are commonly used with selected Cisco switches.

What is SFP-10G-SR-X?

SFP-10G-SR-X is another part number commonly used for Cisco’s 10GBASE-SR SFP+ transceiver. As per Cisco, this module supports multi-rate capabilities, including 10GBASE-SR, 10GBASE-SW, and OTU2/OTU2e, catering to extended operating temperature ranges. Notably, SFP-10G-SR-X distinguishes itself from SFP-10G-SR by its support for OTU2/OTU2e. The OTU2/2e Digital Wrapper IP Core facilitates a 10G/s client transport rate over the Optical Transport Network (OTN).

Furthermore, SFP-10G-SR-X serves as a replacement model for compatible 10GBase-SR SFP+ Transceivers, featuring similar functions and specifications. These alternatives are offered by various third-party providers and retailers.

SFP-10G-SR vs SFP-10G-SR-S vs SFP-10G-SR-X, What is the Similarity and difference?

Let’s now compare the detailed specifications of these transceivers. The figure below outlines the key specifications for the 10GBASE-SR SFP+ modules.

SFP-10G-SR vs SFP-10G-SR-S vs SFP-10G-SR-X

SFP-10G-SR-S vs SFP-10G-SR: Similarities

Here’s a simplified list of their shared features:

  • Product Specification: SFP-10G-SR-S and SFP-10G-SR have identical product specifications.
  • 10GBASE-SR Compliance: Both adhere to the 10GBASE-SR standard.
  • Link Length Support: They support 26m link length on standard FDDI-grade multimode fiber, and up to 300m link lengths over OM3 and 400m link lengths over OM4 cables.
  • Hot-Swappable: Cisco SFP-10G-SR transceivers are hot-swappable I/O devices, allowing seamless connections to fiber optic networks.
  • Compatibility: They can be directly inserted into Cisco SFP+ based transceiver ports without host network system shutdown.
  • MSA Compliance: Both are compliant with the Multi-Source Agreement (MSA) standard.
  • Efficiency: Hot-swappable feature simplifies moves, add-ons, and exchanges for quick network adjustments.

SFP-10G-SR-S vs SFP-10G-SR: Difference

  • Purpose and Features
    SFP-10G-SR-S: Designed for 10G applications in enterprise and data centers, omitting unnecessary features for cost-effectiveness.
    SFP-10G-SR: Provides a broader range of features and compatibility.
  • Price Difference
    SFP-10G-SR-S: Offers a more attractive price due to the streamlined feature set.
    SFP-10G-SR: May have a higher price due to its comprehensive feature package.
  • TAA Certification
    SFP-10G-SR-S: Not TAA certified.
    SFP-10G-SR: TAA compliant for government and public sector use.
  • Protocols
    SFP-10G-SR-S: Supports Ethernet protocols only, excluding OTN and WAN-PHY.
    SFP-10G-SR: Offers compatibility with a wider range of protocols including Ethernet, OTN, and WAN-PHY.
  • Applications
    SFP-10G-SR-S: Primarily tailored for enterprise and data center applications.
    SFP-10G-SR: Provides versatility for various applications.

SFP-10G-SR-S vs SFP-10G-SR-X: Difference

  • SFP-10G-SR-S offers limited temperature tolerance and exclusively supports Ethernet. S-Class optics are well-suited for standard applications, providing cost savings compared to other Cisco transceivers.
  • SFP-10G-SR-X boasts an extended operating temperature range of -40°C to 85°C (-40°F to 365°F). In contrast, standard transceivers typically operate within temperatures ranging from approximately 0°C to 70°C (32°F to 158°F).

FAQs about SFP-10G-SR, SFP-10G-SR-S and SFP-10G-SR-X

Q: What does -X signify in SFP-10G-SR-X?
A: The -X indicates extended temperature capability, allowing operation under a broader temperature range, from -40°C to 85°C (-40°F to 365°F). There are no other significant deviations from standard versions, and the -X designation is typically used when dealing with extreme temperature conditions.

In contrast, standard transceivers are typically designed for operating temperatures ranging from approximately 0°C to 70°C (32°F to 158°F).

Q: What are Cisco “S-Class” transceivers and how are they different?
A: “S-Class” transceivers are a specific category introduced by Cisco to offer a cost-effective option with streamlined features. These transceivers are designed for enterprise and data center applications where essential functionalities are prioritized.

Key attributes of S-Class transceivers:

  • Ethernet Support Only: S-Class transceivers exclusively support Ethernet connectivity.
  • No OTN or WAN-PHY: They lack support for Optical Transfer Network (OTN) or Wide Area Network Physics (WAN-PHY) standards.
  • Temperature Tolerances: S-Class transceivers have reduced operating temperature tolerances.
  • TAA Compliance: They might not comply with Trade Agreements Act (TAA) standards.

In essence, S-Class transceivers are a budget-conscious choice for standard enterprise and data center applications. They provide the necessary connectivity without unnecessary additional features. It’s important to choose them when their specific limitations align with your requirements, helping you save on costs compared to other Cisco transceiver options.

Q: Can SFP-10G-SR Modules Support GE?
A:10GBASE-SR SFP modules can potentially support GE speeds. However, compatibility may vary based on the properties of the host system port. While it might not work on Cisco Catalyst switches in most cases, some systems allow configuring a 10G port to operate in GE mode, with support from the transceiver module.

Q: Which Patch Cable Should I Use for SFP-10G-SR?
A: For the 10GBASE-SR SFP module with an LC duplex connector operating over 850nm for short reach, the ideal choice is a multimode LC-LC fiber patch cable. This cable type supports a link length of 26 meters on standard multimode fiber (MMF). If you’re using laser-optimized OM3 MMF, the reach can be extended up to 300 meters, and with OM4 MMF, it can reach up to 400 meters.

Q: Is the SFP-10G-SR Transceiver Supported on Switches From Different Vendors?
A: The compatibility of the SFP-10G-SR transceiver depends on the vendor’s policy. Most host system vendors accept MSA-compatible transceivers in their systems, as these adhere to industry guidelines. While the 10GBASE-SR SFP module will work on systems compliant with MSA, it might not be supported on systems using proprietary algorithms that differ from MSA guidelines.

Q: Do I need to buy Cisco Branded or Cisco Compatible SFP+ Modules?
A: For authentic SFP+ Modules, it’s advisable to buy directly from Cisco or authorized distributors. But, if you’re budget-conscious and quality-conscious, explore third-party compatible SFP+ transceivers from reputable suppliers like us. The most important thing is, not all SFP+ modules automatically work with Cisco switch SFP+ ports. Compatibility should be confirmed before installation.


The comparison highlights that SFP-10G-SR, SFP-10G-SR-S, and SFP-10G-SR-X are all 10GBASE-SR SFP+ transceivers, differing mainly in operating temperature and supported data rates. While sharing core features, they exhibit minor specification variations. Both SFP-10G-SR and SFP-10G-SR-S are competitively priced compared to SFP-10G-SR-X, making SFP-10G-SR-S an economical choice for many customers. Bonelinks provides high-quality 3rd party 10GBASE-SR SFP+ transceivers that are fully compatible with SFP-10G-SR, SFP-10G-SR-S, and SFP-10G-SR-X, offering cost-effective solutions.

Echo Huang

Echo Huang is an expert wordsmith and marketing professional at Bonelinks with more than 8 years of experience in high technology businesses – fiber optics, IoT, and telecommunication. She is very glad to share industry knowledge and communicate with others.

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