How to Select the Optimal SFP-10G-SR Module for Diverse Networking Environments

Updated on Oct 22, 2021 by

The SFP-10G-SR, a Cisco part number, is a budget-friendly, low-power 10G SFP+ module designed for short-reach links. This article is a concise FAQ resource for beginners learning about 10G SFP+ SR modules.

Gigabit Ethernet Support

The 10GBASE-SR SFP+ transceiver modules can theoretically support 1Gbps Gigabit Ethernet (GE) speeds, but the feasibility also depends on the configuration properties of the ports on the network equipment being used. For Cisco Catalyst series switches, these modules mostly do not permit operation at speeds lower than their original design speed, which is 10Gbps. However, on some network devices, administrators can adjust 10Gbps ports to operate at 1Gbps Gigabit Ethernet speeds through configuration, under which circumstances the 10GBASE-SR SFP+ modules may be supported.

Comparing Different 10G Module Types

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

The widely-used Cisco optical modules SFP-10G-SR-S and SFP-10G-SR-X are models of the 10GBASE-SR SFP+ transceivers. The "SFP-10G-SR-S" represents Cisco's "S-Class" standard-grade optical modules, which are tailored for applications that require only common enterprise and data center features.

  • SFP-10G-SR-S modules have more limited temperature adaptability and provide support solely for Ethernet, making them a cost-effective choice for most standard scenarios.

  • SFP-10G-SR-X modules extend the operational temperature range, maintaining stability under more extreme temperature conditions (from -40°C to 85°C, or -40°F to 185°F). This contrasts with the typical temperature limits of general optical modules (approximately 0°C to 70°C, or 32°F to 158°F), making the "SFP-10G-SR-X" module more suitable for scenarios where there is significant variation in environmental temperatures.

SFP-10G-SR vs FET-10G

Hardware-wise, SFP-10G-SR and FET-10G transceivers are fundamentally the same, yet they're distinguished by their distinct firmware. The FET-10G flaunts specialized coding meant to seamlessly integrate with the Nexus 2000, Nexus 5000, and Nexus 7000 series switches. This specialized coding ensures that the FET-10G is identifiable and operational solely with these specific Cisco Nexus families.

Optimal Choices for 10G Connections

DAC vs SFP-10G-SR vs 10GBASE-T

When existing infrastructure includes copper cabling, or when the devices to be interconnected only offer 10G copper ports, 10GBASE-T SFP+ modules become a necessary choice. For shorter runs, particularly within or between racks, which generally span 0 to 50 meters, Direct Attach Cables (DAC) or Active Optical Cables (AOC) present more budget-friendly alternatives. However, for connections that exceed the 50-meter mark, the use of an SFP-10G-SR transceiver paired with a fiber patch cable is required to ensure adequate link performance and reach.

Patch Cables Selection

The 10GBASE-SR SFP module utilizes an LC duplex connection and supports 850nm multimode fibers. For best performance, it should be used with an LC-LC multimode fiber patch cable. While the standard connection spans 26 meters, utilizing OM3 fiber extends the reach to 300 meters, and OM4 fiber pushes it to 400 meters.

Compatibility and Support

The compatibility of the SFP-10G-SR module largely depends on the host system's acceptance of third-party transceivers. Most vendors conform to the Multi-Source Agreement (MSA), which means they will accept MSA-compliant modules like the 10GBASE-SR. However, systems employing proprietary protection algorithms may not support SFP-10G-SR modules that do not match their specific requirements.

FS Transceiver Compatibility on Cisco Switch

Choosing Cost-Effective SFP-10G-SR Modules

OEM SFP-10G-SR modules, supplied by established brands like Cisco, Juniper, or Intel, can be significantly more expensive due to branding and markups, often costing over 10 times the manufacturing price. However, compatible modules that adhere to the same specs and MSA standards offer equivalent performance at a fraction of the cost, making them a popular alternative among users. Prices for compatible SFP-10G-SR modules can differ between suppliers, but choosing cost-effective options like FS.com's SFP-10G-SR is a smart decision, providing reliable functionality without the premium expense.

FS SFP-10G-SR Module


Overall, with a comprehensive understanding of the capabilities, models, and compatibility factors, network administrators and designers can make informed decisions when implementing or expanding their 10G network infrastructure, balancing performance requirementswith budget constraints.

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