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QSFP-40G-ER4-C
40GBASE-ER4 QSFP+ SMF Module Cisco Compatible
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QSFP-40G-ER4-C is a QSFP transceiver designed to deliver a 40G Ethernet data rate, featuring an LC connector and engineered for extended-range transmission over single-mode fiber. It is specifically built to meet the demanding requirements of data centers, telecom environments, and enterprise networks, ensuring high-performance connectivity over distances up to 40 km.
QSFP-40G-ER4-C’s compact QSFP form factor makes it ideal for high-density networking applications, with physical dimensions optimized for modern equipment chassis. It supports Ethernet protocols and leverages precise optical engineering—with wavelengths centered around 1310 nm—to provide a reliable and efficient solution for next-generation network interconnects.
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| QSFP-40G-ER4-C |  QSFP-40G-SR-BD-C |  QSFP-4X10G-LRL-S-C |  QSFP-40G-SR4-C |  FET-40G-C | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP | QSFP | QSFP | QSFP | QSFP+ |
| Data Rate | 40G | 40G | 4x10G (40G) | 40G | 40G |
| Connector Type | LC | LC | LC | MPO | LC |
| Wavelength | 1310 nm | 850 nm | 1310 nm | 850nm | 1310 nm |
| Transmission Distance | Extended-Range | Short-Range | Long-Range | Short-Range | Long-Range |
| Fiber Type | Single-mode | Multi-mode | Single-mode | Multi-mode | Single-mode |
| Max Distance | 40 km | 100 m | 10 km | 100m (OM3)/150m (OM4) | 10 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet, Fibre Channel |
| Network Interface | Fiber | Fiber | Ethernet | Ethernet | Fiber |
| Power Consumption | N/A | N/A | 3.0 W | 4.2W | 3.8 W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | N/A | N/A | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco | N/A | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista |
| Product Name | QSFP-40G-ER4-C | QSFP-40G-SR-BD-C | QSFP-4X10G-LRL-S-C | QSFP-40G-SR4-C | FET-40G-C |
| Height | N/A | N/A | 0.47 inches | N/A | 0.73 inches |
| Width | N/A | N/A | 0.94 inches | N/A | 2.85 inches |
| Depth | N/A | N/A | 1.5 inches | N/A | 1.48 inches |
| Weight | N/A | N/A | 0.1 lbs | N/A | 0.11 lbs |
Phenomenal 40KM reach. This ER4 module is stable and robust, offering a massive power budget for our longest 40G fiber links. Seamless Cisco integration.
Exceptional ER4 signal integrity. This module is a dependable choice for our long-range transport network. Consistent performance with zero maintenance required since deployment.
Reliable and high-performing ER4 optic. It delivers professional-grade stability over extreme distances. Full hardware compatibility and high throughput ensured for our network backbone.
Outstanding 40KM reach for 40G links. The signal clarity is amazing even at maximum distance. A solid, cost-effective solution for regional connectivity expansion.
Professional 40G ER4 transceiver for our long spans. Recognized immediately by our Cisco core switches. Rock-solid performance under heavy load. Truly impressive hardware.
The QSFP-40G-ER4-C is a Cisco-compatible 40GBASE-ER4 QSFP+ transceiver designed for long-reach single-mode fiber (SMF) links up to 40 km.
Yes, the QSFP-40G-ER4-C is 100% Cisco-compatible, supporting full interoperability with Cisco Nexus, Catalyst, and UCS platforms.
This module supports up to 40 km link budget over single-mode fiber with standard SMF and compliant optical budgets.
The QSFP-40G-ER4-C is optimized for single-mode fiber (SMF) only and is not qualified for multimode fiber (MMF).
It employs four wavelengths around 1310 nm (nominal 1295.56, 1300.05, 1304.58, 1309.14 nm) for parallel 10G lanes.
Yes, the module includes IEEE 802.3ae-compliant DDM for real-time monitoring of optical power, temperature, voltage, and bias current.
Typical power consumption is ≤3.5 W, ensuring energy efficiency in high-density 40G deployments.
The module operates from 0°C to 70°C (commercial) with an extended option of –40°C to 85°C for harsh environments.
Yes, the QSFP+ form factor supports hot-plug functionality for seamless installation and removal under power.
It supports a data rate of 40.0 Gbps aggregated across four 10 Gbps lanes in compliance with IEEE 802.3ba.
Align the module with the QSFP+ port, push until it clicks, and verify link LED status for successful installation.
Yes, it meets Multi-Source Agreement (MSA) standards for broad interoperability across MSA-compliant 40G ports.
Yes, the module is fully compliant with RoHS Directive 2011/65/EU for hazardous substance restriction.
Common use cases include data center interconnects, metro networks, and high-speed backbone links up to 40 km.
Yes, it can be used with standard CWDM multiplexers and demultiplexers for cost-effective wavelength management.
The module includes a one-year limited warranty with optional extensions for complete peace of mind.