Part Number Change Notice for 400G Cable & Transceiver Modules

Sep 24, 2025 - Part Number Change Notice for 400G Cable & Transceiver Modules FS announces a part number change for the optical modules and cables listed below. This is solely a product part number change announcement - functionality remains completely unaffected when using the new part numbers. The updated numbering system is designed to streamline the customer ordering process. 1. Direct Attach Cables (DACs) & Active Optical Cables (AOCs) Former Part Number Upgraded Part Number Date QSFP-DD-PCxx (0.5m-3m) QDD-400G-PCxxx (0.5m-3m) Mar 22, 2024 QDD-ACxx (1m-5m) QDD-400G-ACxxx (1m-5m) QSFP-DD-AOxx (1m-100m) QDD-400G-AOxxx (1m-100m) Q112-PCxx (0.5m-1.5m) QSFP-400G-PCxxx (0.5m-1.5m) Q112-ACxx (1m-3m) QSFP-400G-ACxxx (1m-3m) OSFP400-QDDPCxxx (0.5m-2m) OSFPFL-400G-QDDPCxxx (0.5m-2m) Q-2Q56PCxx (0.5m-3m) QDD-400G-2QPCxxx (0.5m-3m) QDD-2Q56ACxx (1m-5m) QDD-400G-2QACxxx (1m-5m) QDD-2Q56AOxx (1m-30m) QDD-400G-2QAOxxx (1m-30m) O56-2Q200G-PCxxx (1m-30m) OSFP-400G-2QPCxxx (1m-30m) Mar 14, 2024 OSFP400-2Q56AOxxx (3m-30m) OSFP-400G-2QAOxxx (3m-30m) Q-4Q56PCxx (0.5m-3m) QDD-400G-4QPCxxx (0.5m-3m) Mar 22, 2024 QDD-4Q56ACxx (3m-5m) QDD-400G-4QACxxx (3m-5m) QDD-4Q56AOxx (1m-50m) QDD-400G-4QAOxxx (1m-50m) Q-4Q28ACxx (3m) QDD-400G-4Q4xNACxxx (3m) QDD-4Q28AOxx (1m-20m) QDD-400G-4Q4xNAOxxx (1m-20m) Q-8S56PCxx (0.5m-3m) QDD-400G-8SPCxxx (0.5m-3m) QDD-8S56AOxx (1m-70m) QDD-400G-8SAOxxx (1m-70m) 2. QSFP-DD Modules Former Part Number Upgraded Part Number Date QSFPDD-SR8-400G QDD-SR8-400G Jan 18, 2024 QSFPDD-LR8-400G QDD-LR8-400G QSFPDD-FR4-400G QDD-FR4-400G QSFPDD-LR4-400G QDD-LR4-400G QSFPDD-ER8-400G QDD-ER8-400G QSFPDD-DR4-400G QDD-DR4-400G QSFPDD-PLR4-400G QDD-PLR4-400G Mar 14, 2024 QSFPDD-XDR4-400G QDD-XDR4-400G 3. QSFP112 Modules Former Part Number Upgraded Part Number Date Q112-DR4-400G QSFP112-DR4-400G Mar 14, 2024 Q112-SR4-400G QSFP112-SR4-400G Q112-FR4-400G QSFP112-FR4-400G Q112-LR4-400G QSFP112-LR4-400G Q112-XDR4-400G QSFP112-XDR4-400G Mar 22, 2024 4. Transmission Modules Former Part Number Upgraded Part Number Date QSFPDD-ZR-400G QDD-ZR-400G Apr 14, 2025 QSFPDD-ZRP-400G QDD-ZRP-400G QDD-ZRP-400G-HT QDD-ZRPH-400G 5. Loopback Modules Former Part Number Upgraded Part Number Date QSFP-DD-LB QDD-LOOP-400G Jan 18, 2024 Customer Impact of Change and Recommended Action No functional changes - There is no change to the fit or function of the products. Customers may receive either label until the old inventory is depleted. No action required - No action is needed by customers. Questions? - Please Contact Us for any questions or concerns.

Sep 11, 2025 - For details, please click the attachment icon below to view or download for a good reading experience or resources.

Jun 20, 2025 - For details, please click the attachment icon below to view or download for a good reading experience or resources.

QSFP112-FR4-400G Test Report

Jun 11, 2025 - For details, please click the attachment icon below to view or download for a good reading experience or resources.

800G&400G Transceiver Acceptance Testing Guide

Oct 14, 2024 - For details, please click the attachment icon below to view or download for a good reading experience or resources.

May 28, 2024 - For details, please click the attachment icon below to view or download for a good reading experience or resources.

May 28, 2024 - For details, please click the attachment icon below to view or download for a good reading experience or resources.