A marginal pass suggests you are close to the limit, something which many customers will question and possibly reject. The problem is that ANSI/TIA-1152 and IEC 61935-1 state that a marginal pass simply results in an overall pass condition. It has met the requirements of the standard. If you want to reject marginal results, you will need to specifically state that in your test specification. Read about #2 Dumb Thing neglecting marginal test results
ansi tia 1152 pdf download
This poster is a quick reference guide for Twisted Pair Cabling Measurements and documents all the relevant measurement requirements in ANSI/TIA-568.2-D and 1152-A with detailed illustrations and straightforward explanations.
The TIA Standard 1152-A was ratified in autumn 2016. It specifies the parameters and accuracy required to certify structured cabling according to ANSI/TIA performance categories up to CAT8. The corresponding IEC standard 61935-1, 5th edition, was ratified in 2019. It specifies the parameters and accuracy required to certify structured cabling to ISO/IEC Performance Classes up to Class II. He also distinguishes between Class I and Class II for the accuracy of measurements up to 2000 MHz.
Resistance unbalance tests are optional tests per definition by the measurement standards (ANSI/TIA 1152-A and ISO/IEC 11801 3rd ed.) and will at some point be interesting for high power PoE applications up to 100W. At current, the IEEE organisation is in the process to define 100W PoE (IEEE 802.3bt) and the international standards organisation is working the technical report TR29125 for remote powering to support above IEEE 802.3bt. Once those standards become relevant in the field, field testing of resistance unbalance will make sense in applications where high power PoE up to 100W will be used.
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