Which impedance modes do FXS interfaces on a 4FXS1FXO interface card support

FXS interfaces on a 4FXS1FXO interface card support two DC impedance modes: 50 ohm (default) and 800 ohm.
FXS interfaces on a 4FXS1FXO interface card support three AC impedance modes: 600 ohm (default), 270+(750||150 nF) ohm, and 275+(780||150 nF).

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