1. BS EN 61280-2-9:2009 Fibre optic communication subsystem test procedures -Part 2-9: Digital systems - Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems

2. BS EN 61280-4-1:2009 Fibre optic communication subsystem test procedures - Part 4–1: Installed cable plant - Multimode attenuation measurement

3. BS EN 61280-4-2:2014 Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-mode attenuation and optical return loss measurement

4. BS EN 61284:1998 IEC 61284:1997 Overhead lines -requirements and tests for fittings

5. BS EN 61285:2015 Industrial-process control - Safety of analyzer houses

6. BS EN 61287-1:2014 Railway applications - Power converters installed on board rolling stock - Part 1: Characteristics and test methods

7. BS EN 61290-1-1:2015 Optical amplifiers - Test methods - Part 1-1: Power and gain parameters - Optical spectrum analyzer method

8. BS EN 61290-1-3:2015 Optical amplifiers -Test methods - Part 1-3: Power and gain parameters - Optical power meter method

9. BS EN 61290-10-1:2009 Optical amplifiers - Test methods - Part 10-1: Multichannel parameters - Pulse method using an optical switch and optical spectrum analyzer

10. BS EN 61290-10-4:2007 Optical amplifiers - Tested methods - Part 10-4: Multichannel parameters - Interpolated source subtraction method using an optical spectrum analyzer