The small form-factor pluggable 1.25G SFP is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. SFP modules are designed to support SONET, Gigabit Ethernet, Fibre Channel, and other communications standards. Most SFP transceivers are used for Gigabit Ethernet. SFP if the next generation of GBIC and about half the size of the GBIC. All SFP tansceiver may come with DOM (Digital Optical Monitoring) also called DDM (Digital Diagnostic Monitoring). This enables the end user to monitor the temperature, voltage use, Tx power and Rx power of the SFP optics. Most modern switches have this functionality built in. SFP transceivers can be made both in commercial grade 0~70C and industrial grade -40~85C.