This part of IEC 60876 applies to fibre optic switches possessing all of the following general features: ?C they are passive in that they contain no optoelectronic or other transducing elements; ?C they have one or more ports for the transmission of optical power and two or more states in which power may be routed or blocked between these ports; ?C the ports are optical fibres or optical fibre connectors. This standard establishes uniform requirements for: ?C fibre optic switch requirements; ?C quality assessment procedures.