EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 105)

Bit Pattern Analysis and the Gearbox
Optical Modulation Analyzer 97
Performing Detailed Bit Pattern Analysis with the Gearbox
To set or import the Gearbox stream alignment parameters
(Mapping section of the configuration file):
1. From the Settings menu, select Gearbox Stream Alignment.
2. Select a Modulation format and Gearbox layout. Each combination
corresponds to a configuration file (.gearbox). You can process
multiple combinations without exiting this dialog box.
3. Click Import to load an existing configuration file (.gearbox). The file
must match the selected modulation and layout. The symbol
coordinates section is also imported, even if it is not displayed.
4. For each modulator input, select the Bit alignment (bit names from 0
to N) and Delay (in “block” counts, from 0 to +5).
Note: This step applies to streams that are split into sub-streams. The boxes are
disabled (and all fields set to 0) if you select “N individual streams”.

For “one global stream”, all bit alignment values must be different.

For “dual X-Y streams”, bit alignment values for X must be different
from each other, and similarly for Y.
5. Click Apply to confirm your settings, or OK to also close the window.