The L8990M states can be divided into 2 categories: app settings and per-channel settings. The L8990M configuration and characterization are app settings. Switch path is per-channel setting.
"s2p" files
For each possible vna-port-to-test-port path, there is a s2p file (for example, L8990M-0LZ 20-port configuration, there are 32 different s2p files).
“.swp” file (content in xml format)
Switch matrix properties
Link to the s2p file paths
VNA state file
L8990M external device configuration
VNA state can contain multi channels, each channel contains its own:
Switch path selections
Test Port Labels
De-embedding settings