Connecting SCALANCE M-800 to WAN 
  1.3 Connecting M826 with SHDSL 
SCALANCE M-800 Getting Started 
Getting Started, 06/2015, C79000-G8976-C337-04 
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5.  For "Link Data Rate" select auto" and for "Target SNR Ration" select "reliability". 
6.  Click "Set Values". 
 
The SHDSL connection is set up. The devices negotiate the connection parameters. This 
means that the devices use the transmission rate at which the data can be sent and received 
reliably.  
You will find more detailed information on the connection in "Information" > "SHDSL".