Aaeon Rugged Tablet Computer RTC-840 Manual page 33

R u g g e d T a b l e t C o m p u t e r R T C - 8 4 0
Attention: When using the data communications function, please do not
plug the phone cord into the ISDN or PBX jack to avoid an electrical surge
that will cause the MDC module to burn.
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Chapter 2 Getting Started