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What is the modularity of the FXO and FXS boards?

Each FXS board enables 2 analog extension lines in the switch.

Each FXO board enables 2 analog extension lines in the switch.

The switch has 4 slots for analog boards. There is no board type minimum or maximum  limit which can be installed in the switch (respecting the quantity of 4 slots).

Each FXS board enables 2 analog extension lines in the switch.

Each FXO board enables 2 analog extension lines in the switch.

The switch has 4 slots for analog boards. There is no board type minimum or maximum  limit which can be installed in the switch (respecting the quantity of 4 slots).