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Continuation of Questions 1 and 2/5 studied in 1997-2000
Type of Question
Task-oriented
Reason for question
At least four major changes have occurred which affect the
requirements of the existing resistibility recommendations.
a) The access network is rapidly changing from a
traditional exchange (switching centre) which may be
kilometres from the customer to the switching equipment
being close to the customer, digital circuits (e.g. ISDN)
are being used, high-speed data services (xDSL) are being
introduced, voice can now be transmitted over the Internet
and routers with packet-switching compete with conventional
switching systems.
b) The environment where the equipment is housed is also
changing. Traditionally switching equipment has been
installed in a controlled environment with the protection
installed in an MDF. With miniaturization and changing
technologies bulky rack-mounted equipment has been replaced
by small equipment which may be installed on a wall, in a
shelter or underground with the high current protection
integral to the equipment.
c) Many countries have regulations regarding grade of
service where the operator can be fined if an adequate grade
of service is not provided. There is a need to reduce the
level of overvoltage and overcurrent damage to equipment.
d) In the past some operators have specified more
stringent requirements for their equipment due to
environmental factors requiring specific equipment designs.
With globalization, competition and bans on trade barriers
it is necessary to have global requirements.
These changes require study to determine what steps are
required to ensure that the recommendations fit the needs of the operators.
Text of question
The objective of this question is to maintain and enhance
existing resistibility recommendations for telecommunication
equipment interfaces such as switching equipment, transmission
equipment, repeaters, regenerators and routers, etc. and for
protection 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.
Specific objective and time-frame
The outcome of these studies should be updated
Recommendations K.11, K.12, K.15, K.17, K.20, K.21, K.22, K.28,
K.30, K.36, K.41, K.44 and K.45 with better linkage and
coordination between these Recommendations and other
recommendation within the K-series within the study period.
Relationship to other
- Recommendations
- Questions
- Study Groups
- Standardization bodies
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