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Enlarged continuation of Question 11/5 and part of Question 7/5
studied in 1997-2000
Type of question
Task-oriented
Reason for question
The growth in demand for data services in small businesses
and the home is driving telecommunications operators to provide
high bandwidth connections to these customers. Because of the
desire to reuse existing access systems and hardware (on cost grounds)
new technical approaches generally involving spread spectrum techniques
are being developed and implemented. These techniques introduce a new
family of EMC issues.
Text of question
This question will study the impact of spread spectrum
techniques and other modulation techniques on the electromagnetic
environment. This question will produce one or more recommendations
which will allow telecommunication network operators to minimize
the risk of interference to the user of the radio spectrum from
these new access systems. In particular the question will study
whether the increase in the probability of the existence of
interfering signals generated by the spread spectrum nature
of these systems is balanced by the reduction in the signal level
at any specific frequency. Work will also review whether the
dominant mechanisms of interference remain the same for these
new systems. Topics such as dithered clocks and frequency may
also be covered by this work.
As a second stream under the same question the validity of
current immunity techniques (especially the need for broadband
radiated and conducted tests) for these new systems will also be studied.
Specific objective and time-frame
One or more recommendations detailing appropriate EMC requirements for
broadband access systems (including the consideration of the need
for a separate broadband test method and emission level) shall be
produced within the study period.
Relationship to other
- Recommendations
- Standardization bodies
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