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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : K.11
Title : Principles of protection against overvoltages and overcurrents
Study Group : V - Protection against Electromagnetic Effects
Version : Revised
Date of adoption : 1991
Notes :
Current CCITT documents recognize lightning and faults on nearby
electrical installations as sources of dangerous disturbances in
telecommunications lines, which may cause damage leading to
interruptions in service and the need for repairs or even hazards to
personnel.
The object of the Recommendation K.11 is to set out principles which
enable the frequency and seriousness of such disturbances to be
limited to levels which take account of quality of service, operating
costs and safety of personnel. These principles are applicable to all
parts of a telecommunications system.
Recommendation K.11 deals principally with the local exchange, local
loop plant and subscribers' equipment, but its contents may have wider
application.
Note - The disturbing phenomena, when they appear, are relatively rare
or of very brief duration (usually of the order of a fraction of a
second) and in framing the Recommendation K.11, consideration has not
been given to methods of avoiding interruption of the functioning of
equipment during an actual disturbance. The CCITT is pursuing the
study of such methods.
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).