Optical Transceivers: all of the various pluggable optical modules sold by FluxLight, Inc. both transmit and receive optical signals and so are referred to as optical transceivers. Each of these physical form-factors is defined in a standards document know as a Multi-Source Agreement, or MSA. Optical transceivers types can be generally grouped into those supporting transmission speeds on the order of 1Gbps and those designed to support rates in the range of 10Gbps. The 1Gbps optical transceivers form factors are known as GBICs and SFPs. Some of these devices support rates on the order of 100Mbps (Fast Ethernet and OC-3/STM-1) while others support rates of greater than 4Gbps (4G Fiber Channel and OC-48/STM-16). Optical transceivers form factors associated with 10Gbps transmission are: XFP, X2, XENPAK and SFP+.