K.Imp44-2012
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2014-01-20
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GUIDE ON THE USE OF THE OVERVOLTAGE
RESISTIBILITY RECOMMENDATIONS
Summary
The Resistibility Guide assists test laboratories in implementing the correct tests for ITU-T K.20, K.21, and
K.45 compliance testing. It will have four definitive sections:
1) introduction with general comments
2) definition of terms
3) general test plan flow charts
4) test circuit schematics
This guide will assist the lab engineers and technicians in developing the correct test plans for equipment
being submitted for ITU-T K.20, K.21 or K.45 compliance testing. It provides the proper sequence of testing
to be conducted, shows specific test sequence for single pair ports and multiple pair ports with and without
primary protection in both internal and external environments:
1) symmetric single pair ports,
2) coaxial ports,
3) power ports and
4) ac mains ports
This Guide also provides a practical example, using a Home Gateway application that is subject to
Recommendation ITU-T K.21. This application example contains ADSL port types, mains power port types,
FXO and FXS port types, Ethernet port types, and USB port types.
1 Introduction
The testing of equipment, particularly equipment with multiple external and internal ports, is complex and
lengthy. There are many tests per port and many combinations of external and internal ports to test. These
tests are performed with combinations of ports terminated and coupled to earth. The purpose of this
document is assist in laying out a test plan to ensure that adequate testing is performed to ensure compliance
with the required recommendation.
The present document is composed of 3 parts:
General remarks, definitions
General test plan
Test plan according to the family of equipment.
2 Scope
This recommendation applies to all equipment covered by the scopes of Recommendations ITU-T K.20,
K.21 and K.45 recommendations.
3 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
Recommendation ITU-T K.20, "Resistibility of telecommunication equipment installed in a
telecommunications centre to overvoltages and overcurrents".
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