Existing and new industry standard MSA (multi-sourced agreement) optical transceiver modules (e.g., QSFP, OSFP) are plugged into cages with heat sinks attached that are mounted in servers and switches generally designed for front to back cooling. The following descriptions and images describe side cooling methods to enable an airflow path through new MSA module cages and shells, while utilizing the same module paddle cards containing opto-electronics.
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Leigh, Kevin; Ganta, Sunil; and Norton, John, "Side-cooling of pluggable optical transceiver modules", Technical Disclosure Commons, (March 24, 2017)