User manual

CEP AG Revision 0.9
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Page 12 of 26
Although this will not be an issue in almost all typical applications of the modem,
please consider following points:
 Large capacitors in your power supply which will lead to slow leading and
falling edges (issue does not apply with modern stabilized switching regulator
power-adaptors) AND TO_IN tied in parallel to VCC (instead of separate
dedicated digital signal)
 Slow analogue signals used to assert TO_IN
 TO_IN signal not before VCC
All 3 cases above might prevent the modem from recognizing the power-up signal
this is no failure of the modem itself, the same would apply to almost any electronic
device that provides a separate “power-on” or “reset” signal.
If you are in doubt, please
 Use the mains power adapter that is provided by your distributor and is know
to work properly with your modem
 Make sure that your signal and system design is according to the above
 Consult our support team that will be more than happy to assist you.