资料介绍
ITU-KINTERNATIONAL TELECOMMUNICATION UNION
ITU-T
TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU
K.21
(07/2003)
SERIES K: PROTECTION AGAINST INTERFERENCE
Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents
ITU-T Recommendation K.21
ITU-T Recommendation K.21 Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents
Summary This Recommendation specifies resistibility requirements and test procedures for telecommunication equipment which is installed in or on a customer premises building. Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction from adjacent a.c. power lines or railway systems, earth
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