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:
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

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.

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.

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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