7.3.5.1.2. Configuring HG 3500 Circuits 
You must configure the appropriate number of circuits for every common
gateway board based on its configuration (see AMO BFDAT: parameter FCTBLK).
As for all circuits, the AMO TDCSU is used for this.
Please note that this step requires a number of HG 3500 specific parameters
that are grouped together for all AMO commands in the branch EVN=HG3550IP.
The parameter DMCALLWD is used to define whether or not this
circuit can be used in a direct media connection.
Please note that you may have to configure the necessary circuit data
(for example, circuit and line parameters, trunk groups, etc.) in advance
using the relevant AMOs.
Each circuit in HG 3500 must have a separate trunk group.