Table data were obtained by calculating the number of cables using formula, rounding Rounding up to the next round number should provide acceptable results, the higher the cable count, the better correlation with the target pathway cable fill ratio, however, rounding down can also be used for all calculations in order to be on the conservative side. In all such cases, it is recommended to recalculate the rounded up values to check their correlation with the two other pathway cable fill ratio criteria. Values one should take into account that at low cable counts (up to three), rounding up can provide results with a high degree of error and even unacceptable results (when rounding up, for example, to two cables can give sum of the cable diameters exceeding the pathway internal dimensions). Formulae provided above with simple transformations can be used for reversed calculation of a number of cables that can be placed in an enclosed pathway with a given internal size at a required fill ratio (assuming all cables are identical): In that case, the pathway cable fill ratio is used as a fill criterion/factor in determining the maximum number of cables. Practical value than the calculation of an actual pathway cable fill ratio. In real life, the number of cables that can be placed in an enclosed pathway is of more The most common scenario is when all cables installed in a pathway are identical in that case the above fill ratio formulae can be simplified:īecause cable distribution pattern is different for different combinations of cable and pathway sizes, there are three cable pathway fill factors commonly used by the telecommunications industry as a de facto standard: – cross-sectional area of pathway internal space: – cross-sectional area of an individual cable: The enclosed pathway fill ratio is a mathematical ratio of an integrated cross-sectional area of all cables within the pathway to the cross-sectional area of the pathway’s internal space: This assumption is made to facilitate calculations and establish unambiguous and straightforward criterion. It does not include allowances for the spaces between cables and that cables may take quite complicated routes different from straight lines. Length-access pathways are equipped with some form of a lid or cover that may be fixed to the base with hinges or be of a removable type.Īn enclosed pathway cable fill ratio is a factor, expressed as a percentage or fraction, used to characterize the degree of pathway filling with its content (e.g., cable).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |