ITU-T K.12-2010_1875: 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.
ITU-T K.12-2010 history
2010ITU-T K.12-2010 Characteristics of gas discharge tubes for the protection of telecommunications installations (Study Group 5)
2006ITU-T K.12-2006 Characteristics of gas discharge tubes (GDT) for the protection of telecommunications installations Study Group 5