An AR router cannot discover the E1 card

The E1 card of the AR router is not registered.

1. Check whether the card is still in the startup process.
- The startup time of an SRU is within 3 minutes. In scenarios where the card is restarted after the system software is updated, the startup time of the card is within 5 minutes.
- The startup time of an interface card is within 5 minutes. In scenarios where the system software needs to be updated, the startup time of the card is within 10 minutes.

2. If a card does not start up within the normal startup time, run the display device command to check the status of the card.
- If the status of the card displayed under the Register field of the displayed output information is Unregistered, the card is not registered. In this case, check whether the card is reset.
- Run the display reset-reason [ slot slot-id ] command in the diagnosis view.
a. If no reset information about the card is displayed, the card has never been registered. In this case, pull out the card and insert it again.
b. If reset causes of the card are displayed, resolve the reset problems of the card based on the displayed causes.

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