This CFP Multi-Source Agreement (MSA) defines the CFP4 form factor of an optical transceiver which can support 40Gbit/s and 100Gbit/s interfaces for Ethernet, ITU-T OTN and other applications. Specifications provided in this document are given as a “delta” to the CFP MSA Hardware Specification Rev.1.4 or the CFP2 Hardware Specification Rev. 1.0.