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ITU-T K.12 2010 Edition, May 1, 2010
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Characteristics of gas discharge tubes for the protection of telecommunications installations
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This Recommendation:

a) gives the characteristics of gas discharge tubes used in accordance with [b-ITU-T K.11] and [b-ITU-T K.46] for the protection of exchange and outdoor equipment, subscriber or customer equipment and telecommunication lines against overvoltages;

b) deals with gas discharge tubes having two or three electrodes;

c) does not deal with mountings and their effect on tube characteristics (see [ITU-T K.65]); characteristics apply to gas discharge tubes as a component, mounted only in the ways described for the tests;

d) does not deal with mechanical dimensions;

e) does not deal with quality assurance requirements;

f) does not deal with gas discharge tubes which are connected to electrical power systems.