# Switching modes

CLASS supports 3 major switching modes (see the MRTCAL user documentation for a more complete description):

- position switching (abbreviated into psw),
- wobbler switching (abbreviated into wsw),
- frequency switching (abbreviated into fsw).

The frequency switching mode can be divided into 2 subcategories:

- unfolded frequency switching (abbreviated ufsw),
- folded frequency switching (abbreviated ffsw).

Up to sep19 GILDAS version, CLASS used the same weighting definitions for all switching modes. In particular for the TIME weights

(1)
where is defined above.