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2. 3) PSM4 MSA group: “100G PSM4 specification version 2,” Sep. 2014
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4. 6) SFF Committee: “INF-8438i Specification for Quad small form-factor pluggable (QSFP) transceiver specification,” revision 1.0, Nov. 2006
5. 7) SFF Committee: “SFF-8665 Specification for QSFP+ 28 Gb/s 4x pluggable transceiver solution (QSFP28),” Revision 1.9, Jun. 2015