DekTec DTM-3200 IP-ASI Converter - Manual (Page 32)

DTM-3200 – OEM Ethernet TSoIP Converter
User Manual
32
{
if(bytes_todo >= 7)
{
*returnData++ = 0x80 + (((*(bin_data + 0)) & (0x7F >> 0) ) << 0);
*returnData++ = 0x80 + (((*(bin_data + 1)) & (0x7F >> 1) ) << 1) + ((*(bin_data + 0) & ~(0x7F >> 0)) >> 7);
*returnData++ = 0x80 + (((*(bin_data + 2)) & (0x7F >> 2) ) << 2) + ((*(bin_data + 1) & ~(0x7F >> 1)) >> 6);
*returnData++ = 0x80 + (((*(bin_data + 3)) & (0x7F >> 3) ) << 3) + ((*(bin_data + 2) & ~(0x7F >> 2)) >> 5);
*returnData++ = 0x80 + (((*(bin_data + 4)) & (0x7F >> 4) ) << 4) + ((*(bin_data + 3) & ~(0x7F >> 3)) >> 4);
*returnData++ = 0x80 + (((*(bin_data + 5)) & (0x7F >> 5) ) << 5) + ((*(bin_data + 4) & ~(0x7F >> 4)) >> 3);
*returnData++ = 0x80 + (((*(bin_data + 6)) & (0x7F >> 6) ) << 6) + ((*(bin_data + 5) & ~(0x7F >> 5)) >> 2);
*returnData++ = 0x80 + ((*(bin_data + 6) & ~(0x7F >> 6)) >> 1);
bytes_todo -= 7;
bin_data += 7;
}
else
{
*returnData++ = 0x80 + (((*(bin_data + 0)) & (0x7F >> 0) ) << 0);
i = 1;
while(bytes_todo > 1)
{
*returnData++ = 0x80 + (((*(bin_data + i)) & (0x7F >> i) ) << i) + ((*(bin_data + (i-1)) & ~(0x7F >> (i-1))) >> (7-(i-1)));
bytes_todo--;
i++;
}
*returnData = 0x80 + ((*(bin_data + (i-1)) & ~(0x7F >> (i-1))) >> (7-(i-1))); //final byte
bytes_todo--;
}
}
if(((len*8)%7) > 0){
return (((len*8)/7) + 1);
}
return ((len*8)/7);
}
4.6 Failsafe mode
The DTM-3200 supports a special “failsafe” mode to enable recovery from an erroneous
configuration. In failsafe mode the unit has no ASI transcoding functionality and the user can only
configure the IP address and load new firmware.
Failsafe mode is entered in the following cases:
 A firmware upgrade of the DTM-3200 has failed.
 The user selected the failsafe mode through configuration option ‘application’
The normal operation mode can be selected again using configuration option ‘application’.