DIN EN 61746-1:2011-10
Calibration of optical time-domain reflectometers (OTDR) - Part 1: OTDR for single-mode fibres (IEC 61746-1:2009); German version EN 61746-1:2011 / Note: DIN EN 61746 (2005-10) remains valid alongside this standard until 2014-01-02.