This part of IEC 61756 covers general information on the subject of fibre management system (FMS) interfaces. It includes references, document structure details, definitions and the rules under which a FMS interface is created. This interface standard defines a fibre management system which is part of an optical network. It provides facilities for the direct exchange of optical signals between the incoming and outgoing fibre optic cables. In order to comply with the standard, the optical functionality, physical, geometrical and mechanical requirements shall be met.