1.7.3. Retrieving the Status of the D channel

The GCIS_EXID_GETBCHANSTATE extension ID is supported when using Springware boards only. When using DM3 boards, the D channel state can be retrieved using gc_GetLineDevState( ) function.

The GCIS_EXID_GETDCHANSTATE extension ID is used for retrieving the status of the D channel of a specified board at any time.

The following table provides the parameter inputs for the gc_Extension( ) function.

Parameter	Input
target_type	GCTGT_GCLIB_CHAN
target_id	line device handle (linedev) of the D channel board
ext_id	GCIS_EXID_GETDCHANSTATE
retblkp	set_id - GCIS_SET_CHANSTATE
	parm_id - GCIS_PARM_DCHANSTATE
	values - DATA_LINK_DOWN DATA_LINK_UP
	value_type - int
mode	EV_SYNC

Note: GCIS_EXID_GETDCHANSTATE applies only to ISDN PRI technology. For ISDN BRI technology, use the GCIS_EXID_GETDLINKSTATE extension ID.

Example

int extGetDChanState (LINEDEV handle)
{
    GC_PARM_DATAP parm_datap;
    GC_PARM_BLKP parm_blkp = NULL, ret_blkp = NULL;
    unsigned long mode;
    int ret_val = 0;
    GC_INFO  t_Info;
    mode = EV_SYNC;
    ret_val = gc_Extension(GCTGT_GCLIB_CHAN,
      handle, GCIS_EXID_GETDCHANSTATE, parm_blkp, 
      &ret_blkp, mode);
    if ( ret_val )
    {
           ret_val = gc_ErrorInfo(&t_Info);
           if (ret_val == GC_SUCCESS) {
                    printf("gc_ErrorInfo() successfully called\n");
                    PrintGC_INFO(&t_Info); 
           } else {
                    printf("gc_ErrorInfo() call failed\n");
           }
    }  
   	 	gc_util_delete_parm_blk( ret_blkp );
    gc_util_delete_parm_blk( parm_blkp );
    return ret_val;
} 

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