How can I detect an ATM link went down?

Due to business reason, we are in a process to replace old Frame Relay
connections with ATM connections. But when Carrier's ATM network had problem
and one of the ATM link went down, the router interface attached to it still
shows up up. For that reason the ISDN backup interface on the same router
wouldn't automatically dial the remote end, and we couldn't meet 7x24
requirement.

There was no such problem before switching to ATM. It works perfectly with
FR connections and ISDN DDR Backup. If there was a problem in one of the FR
links, the interface attached to it will go down and the ISDN interface will
automatically dial the remote end.

Is there any way to get around this problem?

Thanks in advance.

Tony
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