User`s guide

EXPANSION PORT MOUNTING

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,