Cisco QDD-400G-FR4-S 400G Optical Transceiver – Refurb

The Cisco QDD-400G-FR4-S is a high-speed 400G QSFP-DD optical transceiver designed for long-reach single-mode fiber applications. Operating on CWDM wavelengths (1271nm, 1291nm, 1311nm, and 1331nm), it supports transmission distances of up to 2km, making it ideal for data center interconnects, enterprise backbones, and service provider networks.

Built for efficiency and interoperability, this module supports PAM4 modulation with low power consumption and advanced digital diagnostics. Its compact QSFP-DD form factor enables high port density, ensuring scalable and future-ready networking for organizations managing heavy data traffic.

✔ Key Features & Benefits

✔ 400G High-Speed Connectivity – Supports ultra-fast data transfer rates to meet growing enterprise and service provider demands.
✔ Long-Reach Performance – Provides reliable connectivity up to 2km over single-mode fiber.
✔ Compact QSFP-DD Design – Enables dense, scalable deployments without requiring extra rack space.
✔ Standards Compliance – Fully compliant with QSFP-DD MSA and designed for seamless integration into Cisco systems.
✔ Low Power Consumption – Operates under 9W, reducing operational costs and heat generation in large deployments.

✔ Ideal Uses

✔ Data centers requiring ultra-high-speed backbone links.
✔ Enterprise networks supporting cloud-scale workloads.
✔ Service providers delivering scalable metro and core connectivity.
✔ High-performance computing clusters demanding stable 400G links.

✔ Specifications

✔ Condition: Refurbished device with minor scratches and scuffs. Device has been extensively tested and is fully functional.
✔ Brand: Cisco
✔ Model: QDD-400G-FR4-S
✔ Type: 400G QSFP-DD Optical Transceiver
✔ Form Factor: QSFP-DD
✔ Data Rate: 400Gbps
✔ Wavelengths: 1271nm, 1291nm, 1311nm, 1331nm
✔ Fiber Type: Single-Mode Fiber (SMF, G.652/9µm)
✔ Connector: Duplex LC/UPC
✔ Transmission Distance: Up to 2km
✔ Transmitter Type: CWDM EML
✔ Receiver Type: PIN
✔ TX Power: -3.2 to +4.4 dBm
✔ Receiver Sensitivity: ≥ -7.2 dBm
✔ Receiver Overload: 4.4 dBm
✔ Power Budget: 4 dB
✔ Modulation (Electrical): 8 × 50G PAM4
✔ Modulation (Optical): 4 × 100G PAM4
✔ DSP: Integrated TX and RX
✔ FEC: Not Inbuilt (Host-based FEC required)
✔ DDM/DOM: Supported
✔ Extinction Ratio: >3.5 dB
✔ Power Consumption: ≤9W
✔ Packaging Technology: COB
✔ Operating Temperature: 0°C to 70°C (32°F to 158°F)
✔ Warranty: 3 Month Carry-in Warranty
✔ What’s in the Box: 1 × Cisco QDD-400G-FR4-S Transceiver Module