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6 Message Reference
6.3 Hardware Control Messages
Hardware control messages are used to control various hardware devices on the board, including the T1/E1/
J1 Line Interface Units (LIUs), the digital cross connect switches and the clocking mode for the board.
In a static configuration, these hardware blocks can be set up using the s7_mgt protocol configuration utility
along with the appropriate commands in the config.txt protocol configuration file.
If dynamic control of the hardware is required (or the user has elected not to use s7_mgt), the user
application must build and send at least some of the hardware control messages.
The messages in the hardware control category include:
• LIU_MSG_CONFIG - LIU Configuration Request
• LIU_MSG_CONTROL - LIU Control Request
• LIU_MSG_R_CONFIG - LIU Read Configuration Request
• LIU_MSG_R_CONTROL - LIU Read Control Request
• MVD_MSG_RESETSWX - Reset Switch Request
• MVD_MSG_SC_CONNECT - Connect Request
• MVD_MSG_SC_MULTI_CONNECT - Multiple Connect Request
• MVD_MSG_SC_DRIVE_LIU - LIU Switch Initialization
• MVD_MSG_SC_LISTEN - Cross Connect Switch Listen Request