Reference9:Interfaces/BRI/State
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In the State submenu, you can display the state of the ISDN interfaces. The individual columns are explained in the following table.
| Physical State: | Displays the current state of layer 1 (physical layer). Possible states: Up, Down. |
| Link State: | Displays the current state of layer 2 (link layer). Possible states: Up, Down. |
| Channels: | Number of channels and their state. Possible states: Idle, Busy. |
