BS/EN 60794-1-1-2016 pdf download.Optical fibre cables Part 1-1 : Generic specification General.
Optical fibre cables, containing optical fibres and possibly electrical conductors, consist of the following types:
— indoor cables:
— patch cords;
— premises cabling;
— cables for installation in ducts and lashed aerial cables;
— cables for direct burial:
— cables for installation in tunnels:
— aerial cables;
— drop cables;
— underwater cables for lakes, river crossings and coastal applications;
— microduct cabling;
— cables for utility rights of way such as sewers, gas pipes and water pipes;
— overhead cables (power lines):
— optical cables for rapid/multiple deployment;
— other optical fibre cable types not listed above.
6 Materials
6.1 Optical fibre
6.1.1 General
Optical fibres shall meet the requirements of IEC 60793-2. Annex A gives guidance on application performance standards.
6.1.2 Attenuation coefficient
The maximum cabled Fibre attenuation coefficient shall conform to Annex A. Particular values may be agreed between the customer and supplier.
The attenuation coefficient shall be measured in accordance with IEC 60793-1-40.
6.1.3 Attenuation uniformity — Attenuation discontinuities
The local attenuation shall not have point discontinuities in excess of 0,10 dB for single-mode fibre and 0,20 dB for multimode fibre, when measured in accordance with IEC 60793-1 40.
If the primary coated fibres are coloured for identification, the coloured coating shall be readily identifiable throughout the lifetime of the cable and shall be a reasonable match to IEC 60304. Refer to 7.2 for the specification of fibre colour coding.
6.1.6 Polarization mode dispersion (PMD)
Cabled single-mode fibre PMD shall be characterized on a statistical basis, not on an individual fibre basis, as described in IEC TR 6 1282-3. Measurements on individual cabled fibres shall be performed in accordance with IEC 60793-1-48. Measurements on uncabled fibre can be used to generate cabled fibre statistics when the design and processes are stable and the relationship between the PMD coefficients of uncabled and cabled fibre are known
The manufacturer shall supply a PMD link design value, PMD0, that serves as a statistical upper bound PMD coefficient of the concatenated optical fibre cables within a possible optical link. Unless otherwise specified in the detail specification, the PMD0 value shall be less than 0,5 ps/’km with a probability of 10 that this value be exceeded for a numerical concatenation of at least 20 cables.
6.2 Electrical conductors
The characteristics of any electrical conductors shall be in accordance with the relevant IEC
standards
6.3 Other materials
Material used in the construction of optical fibre cables shall be compatible with the physical and optical properties of the fibres and shall be in accordance with the relevant IEC standards.
6.4 Environmental requirements
When requested, information shall be provided on the overall environmental impact of the cable and cable material. This information should include manufacturing, cable handling and environmental impact during the lifetime of the cable. Examples of relevant information are the minimisation or replacement of harmful materials and improvements in waste disposal. Relevant standards include ISO 14001 and ISO 14064-1.
7 Cable construction
7.1 General
The construction, dimensions, weight, mechanical, optical, electrical and climatic properties of each type of optical fibre cable shall be as stated in the relevant specification
Unless otherwise specified, fibres shall be uniquely identified by a scheme agreed between manufacturer and customer.
As per 6.1.5, colours shall be a reasonable match to IEC 60304. Other colours or schemes may be used, as agreed.
7.2.2 Unit colour coding
If required as a part of the unique fibre identification scheme, units shall be uniquely identified.
If colours are used, they shall be a reasonable match to IEC 60304. If other methods, such as a print string, positional identification, threads, etc. are used, they shall conform to the intent of the identification scheme.
7.2.3 Sheath colour coding
Sheath colour coding, if used, shall be as agreed between manufacturer and customer.
8 Measuring methods
8.1 General
Not all tests are applicable to all cables.
Intrinsic characteristics of optical fibres are not normally measured by cable manufacturers. The relevant values are provided by optical fibre manufacturers, available as unitary or statistical values. For practical reasons, the core diameter of single-mode fibres is not specified. Mode field diameter is the relevant specification parameter.
Test results shall follow the rule of rounding half away from zero”, when the results recorded display more than the significant number of digits required in the acceptance criteria (see 3.18).
Guidance on selecting fibres for testing is given in Annex B.
8.2 MeasurIng methods for dimensions
The dimensions of the optical fibres, electrical conductors and cables shall be determined by subjecting samples to tests selected from Table 1. The tests applied, acceptance criteria and number of samples shall be as specified in the relevant specification.BS/EN 60794-1-1-2016 pdf download.