Are the supply voltages of the FXS interfaces on AR routers the same

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The supply voltages of the FXS interfaces on different AR routers may not be the same.

Other related questions:
Are input voltages of all FXS interfaces the same
Input voltages of FXS interfaces vary depending on the device.

What is the function of the FXS interface of an AR router
The function of the FXS interface of an AR router is described as follows: The FXS interface is used to access the analog devices of users. It works as a physical connector which connects a digital telephone switching system and a user device, such as a POTS telephone or a fax machine.

Whether IAD FXS port does not output voltage
IAD FXS port does not output voltage.

How does an AR router determine a same MST region
The device fails to learn correct MAC entries because: - The device does not receive packets because a link is Down, an interface is not added to a VLAN, an interface joins in loop protocol calculation and is blocked, or the MAC address drift detection is configured and an interface or a MAC address is blocked. - There is a loop in the network, causing MAC entry flapping. - The MAC address learning function is disabled, or corresponding sticky MAC address already exists. - The number of MAC entries has reached the upper limit of the device. - A static or blackhole route is configured.

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