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FET-40G-C
40G Fabric Extender Transceiver Cisco Compatible
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FET-40G-C is a high-performance QSFP+ transceiver module engineered to deliver 40G data rates over fiber, featuring LC duplex connectors and optimized for long-range transmission up to 10 km on single-mode fiber. Designed with essential protocols like Ethernet and Fibre Channel in mind, it offers a compact form factor that meets modern data center, enterprise, and telecom network requirements.
Engineered for demanding network environments, FET-40G-C provides reliable, low-latency performance while conforming to strict physical dimensions and operating conditions. Its precise design—featuring standardized dimensions, a 3.3V input voltage, and an operating temperature range from 0 to 70°C—ensures seamless compatibility with leading networking platforms including Cisco, Juniper, Huawei, and Arista.
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 FET-40G-C |  QSFP-40G-ER4-C |  QSFP-40GE-LR4-C |  QSFP-40G-CSR4-C |  QSFP-40G-SR4-C | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP+ | QSFP | QSFP | QSFP | QSFP |
| Data Rate | 40G | 40G | 40G | 40G | 40G |
| Connector Type | LC | LC | LC | LC | MPO |
| Wavelength | 1310 nm | 1310 nm | 1310 nm | N/A | 850nm |
| Transmission Distance | Long-Range | Extended-Range | Long-Range | Short-Range | Short-Range |
| Fiber Type | Single-mode | Single-mode | Single-mode | N/A | Multi-mode |
| Max Distance | 10 km | 40 km | 10 km | N/A | 100m (OM3)/150m (OM4) |
| Supported Protocols | Ethernet, Fibre Channel | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Fiber | Fiber | Ethernet | Ethernet | Ethernet |
| Power Consumption | 3.8 W | N/A | 3.0 W | N/A | 4.2W |
| 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 | 3.3V | N/A | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco, Juniper, Huawei, Arista | Cisco | Cisco, Juniper, Huawei, Arista | Cisco | Cisco / Juniper / Huawei / Arista |
| Product Name | FET-40G-C | QSFP-40G-ER4-C | QSFP-40GE-LR4-C | QSFP-40G-CSR4-C | QSFP-40G-SR4-C |
| Height | 0.73 inches | N/A | 0.2 inches | N/A | N/A |
| Width | 2.85 inches | N/A | 0.55 inches | N/A | N/A |
| Depth | 1.48 inches | N/A | 0.375 inches | N/A | N/A |
| Weight | 0.11 lbs | N/A | 0.15 lbs | N/A | N/A |
Perfect for our Cisco Fabric Extender links. This FET-40G is recognized correctly and provides stable connectivity between our Nexus switches. Very reliable.
Consistent 40G performance for our FEX architecture. This module is robust and was recognized instantly. A dependable and cost-effective alternative for data centers.
Exceptional build quality. This FET-40G transceiver delivers rock-solid performance for our fabric extensions. No issues with signal integrity or latency. Highly recommended.
Reliable and high-performing module for Fabric Extenders. Seamlessly compatible with our Cisco gear. It provided the high-speed link we needed without any hassle.
Professional-grade FET-40G. It delivers stable signaling and full hardware compatibility. Extremely satisfied with the performance and durability of this transceiver in our production.
The FET-40G-C is a Cisco-compatible QSFP+ transceiver designed for 40 GbE fabric extension over multimode fiber, delivering high-density, low-latency connectivity in data center networks.
Yes. The FET-40G-C is fully interoperable with Cisco Nexus and Catalyst series switches, supporting native 40 GbE QSFP+ ports without firmware upgrades or vendor locks.
The FET-40G-C uses the industry-standard QSFP+ (Quad Small Form-Factor Pluggable Plus) form factor in compliance with the SFF-8436 specification.
It requires a 12-fiber MPO/MTP connector, supporting parallel multimode fiber links for 40 GbE transmission.