2014UNE-EN 61746-2:2011/AC:2014 Calibration of optical time-domain reflectometers (OTDR) - Part 2: OTDR for multimode fibres (Endorsed by AENOR in November of 2014.)
2011UNE-EN 61746-2:2011 Calibration of optical time-domain reflectometers (OTDR) -- Part 2: OTDR for multimode fibres (Endorsed by AENOR in May of 2011.)