Cisco QSFP-100G-FR-S Compatible QSFP28 100GBASE-FR Single Lambda 1310nm 2km DOM Duplex LC/UPC SMF Optical Transceiver Module

Overview

This module is a high-performance, MSA-compliant optical transceiver designed as a fully compatible and cost-effective equivalent to the Cisco QSFP-100G-FR-S. It operates according to the 100GBASE-FR standard, which utilizes advanced PAM4 modulation to transmit a full 100 Gbps data stream over a single wavelength (lambda). This single-lambda design significantly reduces complexity and cost compared to older multi-lane 100G standards like LR4.

Engineered for next-generation data center interconnects (DCI), enterprise core aggregation, and service provider networks, this transceiver uses a standard Duplex LC connector. It supports reliable, high-speed connectivity over single-mode fiber for link lengths up to 2 kilometers, providing a simple, point-to-point 100G solution without the need for parallel fiber infrastructure.

Key Features

• 100% compatible with Cisco switches and routers that support the QSFP-100G-FR-S module.
• Standard: Compliant with 100GBASE-FR and QSFP28 MSA.
• Single-Lambda Technology: Utilizes a single 100G PAM4 optical lane for reduced cost and complexity.
• Data Rate: 106.25 Gbps (53.125 Gbaud/s PAM4).
• Connector: Standard Duplex LC/UPC.
• Reach: Supports link lengths up to 2km on SMF (OS2).
• Wavelength: 1310nm EML laser.
• Built-in Digital Optical Monitoring (DOM/DDM) for comprehensive diagnostics.
• Hot-pluggable QSFP28 form factor.

Applications

The QSFP-100G-FR-S compatible module is ideal for:

• Point-to-point 100 Gigabit Ethernet links in data centers and enterprise networks.
• Data Center Interconnects (DCI) up to 2km.
• High-speed connections between core routers and switches.
• Service provider and campus network aggregation.

Specifications

Cross-Platform Compatibility

While programmed for seamless operation in Cisco equipment, this module’s adherence to 100GBASE-FR MSA standards ensures it can also function flawlessly in networking hardware from other major manufacturers that support this optical specification.

FAQ (Technical & Product Questions)

1. What is “Single Lambda” and how is it different from 100GBASE-LR4?

Single Lambda refers to transmitting the full 100G of data over a single wavelength (a single laser). This module uses PAM4 modulation to achieve this. In contrast, older standards like 100GBASE-LR4 use four separate 25G lasers on four different wavelengths (lambdas), which are optically combined (multiplexed) onto a single fiber. The single-lambda approach of 100GBASE-FR results in a simpler, more power-efficient, and more cost-effective transceiver.

2. Can I use a QSFP-100G-FR-S module to connect to a 100GBASE-LR4 module?

No, they are not interoperable. 100GBASE-FR uses single-lane 100G PAM4 signaling, while 100GBASE-LR4 uses four-lane 25G NRZ signaling. Even though both may use a Duplex LC connector, the underlying optical technology is completely different, and they cannot establish a link with each other.

3. Can this module be used for 4x25G breakout applications?

No. The QSFP-100G-FR-S is a single-lane, point-to-point interface. It cannot be split, or “broken out,” into multiple lower-speed links. For breakout applications, you would need a parallel optics module like the QSFP-100G-SR4 or QSFP-100G-PSM4.

4. What kind of fiber patch cable is required for this module?

This module requires a standard single-mode fiber (SMF) patch cable, preferably OS2 grade, with Duplex LC/UPC connectors on both ends. This is the same type of cabling commonly used for 10GBASE-LR or 100GBASE-LR4 transceivers.

5. What does the “-S” signify in the Cisco part number QSFP-100G-FR-S?

In Cisco’s nomenclature, the “-S” suffix often indicates an “S-Class” part. This typically means the module is optimized for standard enterprise and data center reach and environmental conditions, and may have a different feature set or qualification process compared to non-S-Class parts intended for more demanding Service Provider applications.