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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : K.20
Title : Resistibility of telecommunication switching equipment to
overvoltages and overcurrents
Study Group : V - Protection against Electromagnetic Effects
Version : Revised
Date of adoption : 1991
Notes :
Recommendation K.20 seeks to establish fundamental testing methods and
criteria for the resistibility of telecommunication switching
equipment to overvoltages and overcurrents. It should be read in
conjunction with the CCITT Manual, Protection of telecommunication
lines and equipment against lightning discharges and
Recommendation K.11 which deals with the general economic and
technical aspects of protection. The methods may be varied in the
light of particular local circumstances and technical developments.
Recommendation K.20 relates to telephone exchanges and similar
telecommunication switching centres and is concerned mainly with test
conditions to be applied to points intended for the connection of
2-wire subscriber lines. Ports carrying more complex circuits or more
concentrated traffic (such as junctions or multi-channel circuits) may
be tested either in accordance with Recommendation K.20 or in
accordance with other Recommendations such as K.15 and K.17, as
considered appropriate.
The tests are type tests and, although they are applicable to a
complete switching centre, it is recognized that they may be applied
to individual items of equipment during development and design work.
In making the tests, it is necessary to take account of any switching
conditions, either in the unit under test or elsewhere, which may
affect the results.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).