1.17. Direct Layer 2 Access

When using Springware boards, to activate layer 2 access, parameter 0024 in the firmware PRM file must be set to a value that includes the bit represented by the value 01H. See Table 55, Modifiable Protocol Parameters for more information.

When using DM3 boards, direct layer 2 access is supported on a per trunk basis. Direct layer 2 access is enabled by including the following command in the appropriate [CSS.x] section of the CONFIG file, where x identifies a specific trunk (span):

    Setparm=0x9,1 

If this command is not included, direct layer 2 access is disabled. Also, using a 0 instead of a 1 in the command above disables direct layer 2 access.

Note: Any changes to the CONFIG file for a particular protocol requires the regeneration of the FCD file and the subsequent downloading of the firmware to the boards. The FCDGEN tool, available in the dialogic\bin directory, is used to convert a CONFIG file to an FCD file. For more information, see the configuration information for DM3 products provided with the system release software.

Global Call supports direct layer 2 access using the gc_GetFrame( ) and gc_SndFrame( ) functions.

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