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New question
Type of question
Task-oriented
Reason for question
New types of equipment (examples are routers, set-top units
and cable modems) are appearing in the network. Also, different
types of equipment are being interconnected at a customers'
premises and the requirements for the internal interfaces and
the effects of these interconnections need to be considered.
As an example GDTs are specified in K.12 but there is no
recommendation for GDT holders. The holder is as important as
the GDT and its requirements need to be specified.
Text of question
The objective of this question is to produce new resistibility
recommendations for telecommunication equipment interfaces such as
switching equipment, transmission equipment, repeaters, regenerators
and routers, etc. and for protection systems and components such as
SPDs and protection frames. The equipment may be located in
telecommunication centres, customer premise buildings and
outdoor enclosures. The sources of overvoltages and overcurrents
that may cause damage to this equipment include lightning, power
induction and mains power contacts. The types of interfaces
include symmetric pair, coaxial, dedicated power feeds and
mains power ports.
The following issues should be particularly studied:
a) study the resistibility requirements for STUs and cable
modems and write a recommendation;
b) study the requirements for internal interfaces in
customer premises and write a recommendation. Consider
incorporating the requirements of K.22;
c) study the requirements for protection holders/MDFs and
write a recommendation.
Specific objective and time-frame
The outcome of these studies should be new recommendations
for protection holders/MDFs, set-top units and customer premise
internal interfaces within the study period.
Relationship to other
- Recommendations
- Questions
- Study Groups
- Standardization bodies
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