Work item:
|
K.21 (2019) Amd.1 (ex K.21 Amd.1)
|
Subject/title:
|
Amendment 1 to Recommendation ITU-T K.21: Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents
|
Status:
|
Approved on 2020-06-29
|
Approval process:
|
AAP
|
Type of work item:
|
Recommendation
|
Version:
|
-
|
Equivalent number:
|
-
|
Timing:
|
-
|
Liaison:
|
-
|
Supporting members:
|
-
|
Summary:
|
Amendment 1 to Recommendation ITU-T K.21 refers to Annex A. Annex A applies to special environments, one factor being that the primary protection has a poor earth connection that does not meet the requirements of Recommendation ITU-T K.66. This condition is simulated by increasing the STP earth resistance (R1) from zero to 100. People have missed this change, possibly because the test circuit diagram is in Recommendation ITU-T K.44. To alert readers of this a text note has been inserted in the Comments column.
|
Comment:
|
-
|
Reference(s):
|
|
|
Historic references:
|
Contact(s):
|
|
ITU-T A.5 justification(s): |
|
|
|
First registration in the WP:
2020-05-26 09:54:14
|
Last update:
2020-07-07 13:39:59
|