IEC 62148-18:2014 covers the 40-Gbit/s serial physical interface specification of transmitter and receiver components for use with the LC connector interface. The purpose of this standard is to adequately specify the physical requirements of optical transmitters and receivers that will enable mechanical interchangeability of transmitters and receivers complying with this standard both at the PCB level and for any panel-mounting requirement. Keywords: 40-Gbit/s serial physical interface specification, LC connector