Cisco 100GbE 100GBase LR4 QSFP+ Transceiver Module

Overview

The Cisco QSFP-100G-LR4-S= is a pluggable transceiver module designed to add 100 Gigabit Ethernet connectivity to compatible Cisco switches and routers. It supports long-reach 100GBase LR4 performance over single mode fiber, delivering data rates of 100 Gbps across distances up to 6.2 miles (10 km). This module is well suited for environments where bandwidth demands are increasing but space and power consumption must be carefully managed.

Using four optical wavelengths between 1295 nm and 1309 nm, it transmits high-speed data without requiring signal regeneration. Its hot-swappable design allows network administrators to replace or upgrade the module without powering down the chassis, minimizing downtime during maintenance or expansion.

Key features

• Hot-swappable QSFP+ transceiver that enables quick installation and replacement without disrupting network operations
• Supports single mode fiber with duplex LC connectors for reliable long-distance transmission
• Operates on four wavelengths to deliver 100 Gbps data rate over distances up to 10 km, ideal for extended network links
• Low power consumption of approximately 3.5 W helps maintain manageable thermal conditions in dense rack environments
• Compliance with IEEE 802.3 and ITU-T G.652 standards ensures interoperability with other standard-compliant optics and cabling
• Compact QSFP+ form factor supports high port density, making it suitable for spine-leaf fabrics, enterprise cores, and service provider networks

Key specs

• Data rate: 100 Gbps
• Distance: up to 10 km (6.2 miles)
• Wavelengths: 1295 nm to 1309 nm (four optical lanes)
• Connector type: duplex LC
• Power consumption: approximately 3.5 W
• Standards compliance: IEEE 802.3, ITU-T G.652
• Form factor: QSFP+

Connectivity and compatibility

This transceiver module is compatible with Cisco platforms that accept QSFP modules and adhere to IEEE 802.3 and ITU-T G.652 fiber specifications. It integrates seamlessly into existing network infrastructures that use single mode fiber and duplex LC connectors, providing a straightforward upgrade path for expanding 100 GbE links.

Its design supports high-density deployments in data centers and enterprise environments, making it a practical choice for network teams managing multilayer topologies and long-haul connections.

Ideal uses and environments

The module is a strong choice for data centers implementing spine-leaf architectures that require high-speed links across large halls. It also fits well in enterprise core networks connecting multiple campus buildings and in service provider networks delivering 100 GbE to remote aggregation sites. Its balance of long reach, power efficiency, and compact size makes it suitable for setups where space and thermal management are critical.