Cisco QSFP 100GBASE-ER4 Optical Transceiver — Long-Haul Single-Mode Fiber Module for Data Center Interconnects and Core Networks

Designed for enterprise-grade and data-center networks, the Cisco QSFP Module delivers scalable, high-performance 100 Gbps Ethernet with ER4 long-haul capability. This transceiver is built to integrate seamlessly into existing Cisco devices and many third-party switches that support QSFP optics, offering hot-plug deployment, robust error performance, and energy-efficient operation. The module uses single-mode fiber with G.652 specifications and LC duplex connectors, enabling reliable links across data centers, metro networks, and service provider backbones. Whether you're expanding a campus core, upgrading a data-center spine, or enabling high-capacity uplinks, this 100GBASE-ER4 module helps you maximize bandwidth without compromising latency or reliability. Built with Cisco’s quality standards and backed by support resources, it ensures compatibility and consistent performance with a wide range of optical equipment.

• Performance and long-haul capability: Delivers up to 100 Gbps of aggregate data rate using the 100GBASE-ER4 specification, with each of the four 25 Gbps lanes optimized for robust long-haul operation over single-mode fiber. This enables distances up to 40 km (subject to fiber quality and network design), making it ideal for data center interconnects, core/backbone links, and regional deployments. The ER4 approach minimizes the need for intermediate regeneration while maintaining high signal integrity across significant spans.
• Ease of integration and wide compatibility: The module is a plug-in QSFP form factor that fits standard QSFP slots on Cisco devices and many third-party platforms that support QSFP optics, enabling straightforward upgrades with minimal downtime. Its LC duplex connectors align with common fiber installation practices, simplifying patching and reducing the risk of misconnection during installation. This makes it an excellent choice for mixed-vendor environments where performance consistency matters.
• Fiber and optics specification: Optimized for single-mode G.652 optical fiber, ensuring low attenuation and wide compatibility with existing fiber plants. The module uses 1310 nm operational wavelengths, which are standard for ER4 transceivers, delivering reliable performance in metropolitan and long-haul links while providing robust noise immunity and stable signal quality.
• Quality, reliability, and monitoring: Built to Cisco’s rigorous standards, the QSFP module is designed for continuous operation in data centers and enterprise networks. It often supports digital diagnostic monitoring (DDM) for real-time status checks on optical power, temperature, and other parameters, enabling proactive maintenance and quick fault isolation to minimize downtime.
• Operational efficiency and density: Engineered for high-density deployments, this QSFP transceiver enables scalable rack-space utilization and streamlined cabling. It supports plug-and-play operation with familiar management and monitoring interfaces, helping network teams accelerate deployment, reduce maintenance windows, and optimize total cost of ownership.

Technical Details of Cisco QSFP Module

• Form Factor: QSFP
• Module Type: 100GBASE-ER4 transceiver
• Interface: QSFP plug-in module, optimized for high-bandwidth optical networking
• Connector Type: LC Duplex
• Fiber Type: Single-mode (G.652)
• Wavelength: 1310 nm (ER4 standard)
• Data Rate: 100 Gbps (aggregate)
• Distance: Up to 40 km on appropriate single-mode fiber
• Compatible with Cisco devices and other compatible QSFP-capable platforms

How to Install Cisco QSFP Module

• Power down the host device or ensure you are operating in a maintenance window as recommended by your network policy, and verify that you have an ESD-safe workspace.
• Open the device’s service panel and locate the QSFP slot that supports optical transceiver modules compatible with your chassis and line card; verify slot availability and hot-swapping guidelines in your hardware manual.
• Remove the protective caps from both the QSFP module and the corresponding fiber connectors, handling components by the body to avoid touching optical interfaces.
• Align the Cisco QSFP Module with the slot and gently insert it until it clicks into place securely; ensure the captive latch engages to prevent movement during operation.
• Connect the LC duplex fiber pair to the module’s optical port, ensuring the connectors are fully seated and the fiber is properly terminated with the correct cradle or patch panel arrangement.
• Power up the device and verify the link status indicators. Use the device’s management interface to confirm the transceiver is recognized and that signal parameters (rate, wavelength, and link) are reporting correctly.
• Configure the network to enable 100GBASE-ER4 interfaces as needed in your routing or switching software, and validate throughput with a traffic generator or monitoring tool to confirm expected performance.

Frequently asked questions

• Q: What does 100GBASE-ER4 mean for this Cisco QSFP Module?

  A: 100GBASE-ER4 refers to a 100 Gbps Ethernet transceiver that uses four 25 Gbps optical lanes over single-mode fiber to achieve long-haul connectivity. This module is designed for high-capacity links up to tens of kilometers, depending on fiber plant quality and network design.

• Q: What connector and fiber type are used?

  A: The module features an LC Duplex connector and is designed for single-mode fiber, specifically compatible with G.652 specifications, enabling high-performance, long-distance links with low attenuation suitable for data centers and carrier networks.

• Q: Is this transceiver compatible with non-Cisco devices?

  A: The module is described as a QSFP transceiver intended for Cisco devices and other QSFP-capable platforms. Compatibility depends on the host hardware's support for 100GBASE-ER4 and the corresponding firmware. Always verify with the device’s compatibility matrix before deployment.

• Q: What should I expect in terms of installation and maintenance?

  A: Expect a straightforward, hot-pluggable installation into a supported QSFP slot, with LC fiber connections and standard fiber patching practices. Regular monitoring via digital diagnostics (if supported) and routine fiber maintenance will help sustain optimal performance and long-term reliability.

• Q: How can I verify the performance after installation?

  A: Use the network device’s status indicators and management interface to confirm the transceiver is detected, link is up, and the interface reports the correct 100 Gbps rate. Sanity tests with a traffic generator or performance monitoring tool can validate throughput, latency, and BER against your design expectations.