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These transceivers interoperate with 400-Gbps breakout optics. For example, the QDD-400G-DR4 interconnects with four QSFP-100G-DR transceivers. The QSFP-100G-DR transceivers interconnect in single links (QSFP-100G-DR to QSFP-100G-DR or to QSFP-100G-FR) and interoperate at the shortest link length. The QSFP-100G-DR transceivers are not compatible with earlier-generation 100-Gbps transceivers (for example, QSFP-100G-CWDM4 and QSFP-100G-LR4).