Cisco QSFP-100G-SR-S | 100G QSFP28 Transceiver, Single-Mode 850nm, 100m MMF, LC

Q: What is the difference between QSFP-100G-SR-S and QSFP-100G-SR4-S?
A: The QSFP-100G-SR-S is a 100GBASE-SR1 module using a duplex LC connector and single wavelength (850nm) with PAM4 modulation, while the SR4 variant uses an MPO connector with 4 parallel channels of 25Gbps each over 12-fiber ribbon cable. The SR-S model is designed for duplex fiber infrastructure reuse.

Q: Can this transceiver be used with existing 10G or 40G fiber infrastructure?
A: Yes, the QSFP-100G-SR-S supports duplex LC connectors, allowing organizations to leverage existing duplex multimode fiber infrastructure originally deployed for 10G or 40G connectivity when migrating to 100G Ethernet without requiring new MPO cabling.

Q: What Cisco platforms support the QSFP-100G-SR-S module?
A: This module is compatible with Cisco switches and routers featuring QSFP-100G ports, including Nexus 9000 series data center switches, Catalyst 9000 series enterprise switches, and ASR 9000 series routers. Always consult the Cisco 100 Gigabit Ethernet Transceiver Modules Compatibility Matrix for your specific platform.

Q: Does the QSFP-100G-SR-S support breakout configurations?
A: Yes, the QSFP-100G-SR-S can interoperate with IEEE 400GBASE-SR4 transceivers via fiber breakout cables, enabling flexible connectivity options in mixed-speed network environments and migration paths to 400G infrastructure.

Q: What are the typical use cases for this transceiver?
A: The QSFP-100G-SR-S is ideal for short-reach 100G connectivity within data centers, high-performance computing clusters, enterprise campus core and distribution layers, and top-of-rack to aggregation switch connections where multimode fiber is already deployed.