• Cisco QDD-2X100-CWDM4-S QSFP-DD transceiver with blue sound wave logo
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Cisco

Cisco QDD-2X100-CWDM4-S | 2x100G breakout | QSFP-DD | 100G CWDM4 x2 | 1271–1331 nm | 2 km SMF | dual CS (dual‑LC compatible)

QDD-2X100-CWDM4-S

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Description

QSFP-DD 200G optical transceiver that breaks out to two independent 100G CWDM4 links. Ideal for reclaiming port density while connecting two 100G endpoints from a single 200G host port. Supports CWDM4 optics per 100G channel over single-mode fiber up to 2 km. Dual CS front connector presents two duplex optical circuits for simple patching or CS-to-dual-LC harnesses. Requires platform support for 2x100G breakout.

Features

- Consolidates two 100G links into one QSFP-DD port
- Standards-based 100G CWDM4 interoperability per leg
- Long reach up to 2 km over cost-effective SMF
- Dual CS front connector simplifies high-density patching
- Supports DOM for proactive monitoring
- Optimizes spine/leaf and aggregation breakouts

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

- Form factor: QSFP-DD (200G host)
- Breakout mode: 2x 100G
- Optical standard (each 100G): 100G CWDM4 (MSA)
- Wavelengths (per 100G): 1271, 1291, 1311, 1331 nm
- Reach: up to 2 km over G.652 SMF
- Front connector: dual CS (supports two duplex LC circuits via CS harness)
- Host interface: 8x 25G electrical lanes
- FEC: RS-FEC (KP4) on host recommended/required
- Digital diagnostics (DOM/DDM): supported
- Management: CMIS compliant
- Operating temperature: 0 to 70 °C
- Breakout support required on the switch/router QSFP-DD port

FAQs

Q: Can each 100G leg interoperate with a standard 100G CWDM4 optic at the far end?
A: Yes. Each breakout leg behaves as a native 100G CWDM4 interface and links to a standard 100G CWDM4 transceiver over SMF.

Q: What fiber and connectors do I need?
A: Use SMF with a dual CS patch. You can also use a CS-to-dual-LC harness to connect to two standard LC-based 100G CWDM4 ports.

Q: Does this require special configuration?
A: Your QSFP-DD port must support 2x100G breakout mode. Enable breakout in the platform OS where applicable.

Q: Is host-side FEC required?
A: RS-FEC (KP4) on the host is recommended/required for CWDM4 links to meet error performance.

Q: Can I run it as a single 200G link?
A: No. This module is designed specifically for 2x100G breakout operation.

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