An AC remains active until one of the following scenarios occurs:

• The AC is changed, disabled, or removed.

• The time-of-day requirements of a scheduled AC are no longer satisfied.

• One of the endpoints drops the connection. An endpoint might drop a connection because of user action (in the case of a data endpoint), maintenance activity that results from an endpoint failure, busying out of the endpoint, or handshake failure. If the endpoints are incompatible, the connection is successful until handshake failure occurs.

  Note:

  An AC between access endpoints remains connected even if the attached access equipment fails to handshake.

• An interruption, such as a facility failure, occurs between the endpoints. If an AC drops because the AC was disabled, removed, or is no longer due to be active, no action is taken. If an AC drops because of changed AC attributes, the system makes an immediate attempt to establish the connection with the changed attributes, if the AC is still scheduled to be active. Existing entries in the error or alarm log are resolved if the entries no longer apply. If an AC involves at least one data endpoint, and handshake failure causes the connection to be dropped, no action is taken for that AC until you run the change administered-connection command.