FIELD: information technology.
SUBSTANCE: invention relates mainly to data processing centers and server rooms. The rack units are equipped with optical machine-readable tags. The label is photographed together with the section of the guide of the corresponding unit. If the photo of the guide section shows the edge of the guide closest to the mounting holes of the unit, then it is decided that the unit with this identifier is free.
EFFECT: use of the invention makes it possible to increase the reliability of localization of free space in telecommunication racks.
3 cl
