Reference9:Interfaces/PRI/State

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 .

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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.