Brussels hosted a 16 March meeting of CENELEC Technical Committee 209, where the latest developments concerning interference in cabled telecommunications and radio networks (in homes, businesses, buildings, neighbourhoods and industrial areas) related to TV, radio and interactive service signals were debated.
Contacts with representatives of the United States, in an attempt to determine some criteria for minimising product incompatibilities, were not yet sufficiently conclusive. However, an approximation of Japan to these concerns was noted.
Regarding the Italian officials? work on the implications of atmospheric discharges on cabled network structures, they are still in the study and information gathering stage; contacts were undertaken with the American counterparts.
Note that interference and security against untimely discharges in cabled electronic communications networks, caused by electric power transport and distribution networks, were brought to the fore. However, this issue?s systematisation issue has been complex, as power network operations depend on legislation, rules and procedures of each country.
A survey was also carried out regarding the interest and work on electromagnetic compatibility (EMC) produced in each country. ANACOM indicated that in Portugal the National Technical Commission on Electro-technical Standardisation (CTE 210) has been reactivated, an initiative welcomed with a great deal of interest.
Once again the need for all changes, tests, measurements and possible evolutions of equipment, material and measurement devices to be reported to CENELEC (to the respective working group) was emphasised, so that they can be considered in future revisions of standards, as well as to optimise the current EN 500083.
The possibility of splitting the cabled networks into three large groups - CATV, MATV/SMATV and Individual Networks - was also debated, along with the issue of determining the extents of individual networks, due to noise coming from the network structure itself, the inserted active equipment, the modulations, the number of carriers, the frequencies and the power potentials, etc.
Lastly, the need to conduct a specific survey on the reception and distribution of signals via DVB technology was considered. As low power signals are easily subject to interference, there is a need for antennas to be well positioned and in strategic locations. It is thus necessary to enhance knowledge and assure tangible experience regarding this aspect.
The next meeting has been scheduled for 12 October at the CENELEC offices in Brussels, a date to be confirmed later.
