Connecting SCALANCE M-800 to WAN 
  1.1 Connecting M874 with the mobile wireless network 
SCALANCE M-800 Getting Started 
Getting Started, 06/2015, C79000-G8976-C337-04 
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You will find more detailed information on the connection in "Information" > "Mobile". 
 
 
The date and time are kept on the SCALANCE M-800 to check the validity (time) of 
certificates and for the time stamps of log entries. You can set the system time yourself 
manually or have it synchronized automatically with a time server. There are a number of 
time servers on the Internet that can be used to obtain the current time precisely. For this 
example, the time server is configured using NTP.  
 
Note 
Manual time setting - reaction after interrupting the power supply 
Note that the time is reset to the factory setting if the power supply is interrupted. On return 
of the power, you need to set the system time again. As result, certificates can lose their 
validity. 
 
Synchronization using a time server 
Synchronizatio
n of the system time using a public time server creates additional data traffic 
on the connection. This may result in additional costs, depending on your subscriber 
contract.