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ČSN EN 50289-1-9-ed.2 (347819)
Communication cables - Specifications for test methods - Part 1-9: Electrical test methods - Unbalance attenuation (transverse conversion loss TCL transverse conversion transfer loss TCTL)
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STANDARD published on 1.9.2017
The information about the standard:
Designation standards: ČSN EN 50289-1-9-ed.2
Classification mark: 347819
Catalog number: 502671
Publication date standards: 1.9.2017
SKU: NS-693151
The number of pages: 24
Approximate weight : 72 g (0.16 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
The category - similar standards:
Annotation of standard text ČSN EN 50289-1-9-ed.2 (347819):
This European Standard details the test methods to determine the attenuation of converted differential-mode signals into common-mode signals, and vice versa, due to balance characteristics of cables used in analogue and digital communication systems by using the transmission measurement method. The unbalance attenuation is measured in, respectively converted to, standard operational conditions. If not otherwise specified, e.g. by product specifications, the standard operational conditions are a differential-mode which is matched with its nominal characteristic impedance (e.g. 100 Ohm) and a common-mode which is loaded with 50 Ohm. The difference between the (image) unbalance attenuation (matched conditions in the differential and common-mode) to the operational (Betriebs) unbalance attenuation (matched conditions in differential-mode and 50 Ohm reference load in the common-mode) is small provided the common-mode impedance Zcom is in the range of 25 Ohm to 75 Ohm. For cables having a nominal impedance of 100 Ohm, the value of the common-mode impedance Zcom is about 75 Ohm for up to 25 pair- count unscreened pair cables, 50 Ohm for common screened pair cables and more than 25 pair- count unscreened pair cables, and 25 Ohm for individually screened pair cables. The impedance of the common-mode circuit Zcom can be measured more precisely either with a time domain reflectometer (TDR) or a network analyser. The two conductors of the pair are connected together at both ends and the impedance is measured between these conductors and the return path. This European Standard is bound to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application
Preview of the standard ČSN EN 50289-1-9-ed.2 (347819)
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