IEC 62149-4:2010 covers the performance specification for 1 300 nm fibre optic transceiver modules used for the ISO/IEC 8802-3 Gigabit Ethernet application. The performance standard contains a definition of the product performance requirements together with a series of sets of tests and measurements with clearly defined conditions, severities, and pass/fail criteria. The tests are intended to be run on a 'once-off' basis to prove any product's ability to satisfy the performance standard's requirements. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision that includes changes and additions to the performance tables reflecting new technology.