Which feed current types Do FXS interfaces on a 4FXS1FXO INTERFACE CARD Support

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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

Other related questions:
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).

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)

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.

What type of interfaces can VLANs be configured
Currently, the following Ethernet interface types are defined on the AR router: 1. Layer 2 Ethernet interfaces: They are physical interfaces working at the data link layer. These interfaces cannot be configured with IP addresses, but can forward received packets at Layer 2 or be added to VLANs to forward packets at Layer 3 through corresponding VLANIF interfaces. 2. Layer 3 Ethernet Interfaces: They are physical interfaces working at the network layer. These interfaces cannot be added to VLANs, but can be configured with IP addresses and forward received packets at Layer 3.

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