User`s guide

EXPANSION PORT MOUNTING
25
For the majority of applications with a built-in modem in a switch board it is possible
to recognize two sorts of environments:
• no public and industry environment of low voltage with high interference,
• public environment of low voltage without high interference.
For both of these environments it is possible to mount modems to a switch board,
the following there is no need to have examination immunity or issues in connection with
EMC according to EN 60439-1 ed.2:00 + A1:04.
For compliance of EN 60439-1 ed.2:00 + A1:04 specification it is necessary
to observe next assembly of the modem to the switch - board:
• for round antennas we recommend to observe a distance of 6 cm from cables
and metal surfaces on every side according to the next picture due to the elimination
of interference, while using an external antenna except for the switch-board it is
necessary to fit a lightening conductor,
• before mounting a modem on sheet-steel we recommend using an external antenna,
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