Communication cables - Part 4-1: General considerations for the use of cables; Environmental conditions and safety aspects; German version EN 50290-4-1:2001— 13 стр.
Optical amplifiers - Part 5-2: Qualification specifications; Reliability qualification for optical fibre amplifiers (IEC 61291-5-2:2002); German version EN 61291-5-2:2002— 25 стр.
Environmental testing - Part 2: Tests, Test Kb: Salt mist, cyclic (sodium chloride solution) (IEC 60068-2-52:1996); German version EN 60068-2-52:1996— 9 стр.