Add constants for use in interrogating various fiber and copper connectors most often used with network interfaces. The SFF-8472 standard defines the information that can be retrieved from an optic or a copper cable plugged into a NIC, most often referred to as SFP+. Examples of values that can be read include the cable vendor's name, part number, date of manufacture as well as running data such as temperature, voltage and tx and rx power. Copious comments on how to use these values with an I2C interface are given in the header file itself. Discussed with: gnn