This file contains information about the trace mask that can be used 
for the following drivers:
- CDC ACM
-- COM port
-- Modem

bit position -- meaning
0 - fatal error
1 - errors
2 - information
3 - PnP information

4 - power management
5 -
6 - create, close
7 - API calls

8 - read, write without data
9 - IRP handling
10 - USB configuration
11 - Wait mask

12 - USB data transfer
13 - ref counting
14 - USB read handling
15 - USb write handling

16 - Port timer
17 - status signals RTS,CTS, ...
18 - SerPort handling
19 - OptPPP mode

20 - CTS Slow
...

31 - some other

