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

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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).

###### Other related questions:
What is the signaling frequency of the FXS interfaces on a 4FXS1FXO interface card
The FXS interfaces on a 4FXS1FXO interface card support signaling frequencies of 16 Hz, 25 Hz, and 50 Hz. The default signaling frequency is 25 Hz.

Do FXS interfaces on a 4FXS1FXO interface card support polarity reversal
FXS interfaces on a 4FXS1FXO interface card support polarity reversal. This function is disabled by default.

Which AC impedance modes do FXS interfaces on a 4FXS1FXO interface card support
FXS interfaces on a 4FXS1FXO interface card support the following AC impedance modes: 0 - CNOF (200+680||100nf) 1 - CNUSER (200+560||100nf) 2 - 600 ohm interface (default) 3 �?RUSSIA (150+510||47nf) 4-(220+820||115nf) 5-(220+820||120nf) 6 - 900 ohm interface 7 - BRAZIL (800||50nF) 8-BT0 (Zin=87+1052||228nF+229||284nF,Zload=93+615||471nF+179||495nF+244||32nF)

Which feed current types Do FXS interfaces on a 4FXS1FXO INTERFACE CARD Support
FXS interfaces on a 4FXS1FXO interface card support the following feed current types: 0-16 mA constant current 1-20 mA constant current 2-25 mA constant current 3-30 mA constant current 4-35 mA constant current 5-40 mA constant current 6-45 mA constant current

Which interface backup modes are supported by AR routers
AR routers support two interface backup modes: active/standby mode and load balancing mode. V200R001C01 and later versions support three association modes: association between interface backup and NQA, association between interface backup and BFD, and association between interface backup and routing.

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