How to determine whether a hardware fault occurs on the AM module?
You can do as follows to determine whether a hardware fault occurs on the AM interface module.
1. Run the following command to view information about the interface. Check whether DTR, DSR, RTS, and CTS are Up. If one is Down (in this example, CTS is Down), it indicates that a hardware fault occurs in the slot or on the AM module.
<Router> display interface Analogmodem 1/0
Analogmodem1/0 current state :DOWN
Line protocol current state :UP (spoofing)
Description : Analogmodem1/0 Interface
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Internet protocol processing : disabled
Link layer protocol is PPP
DCD=UP DTR=UP DSR=UP RTS=UP CTS=DOWN
2. For further confirmation, run the debug dialer event command on the device, and then perform the ping operation to trigger dialup. Observe whether the device initiates a dialup connection. If similar information shown as follows is not displayed, it indicates that the configuration is incorrect. Check the configuration.
*Jun 9 14:40:52:930 2006 CALLOUT DCC/8/debug:DCC: Dialing 660004 on interface Analogmodem 1/0 //The message indicates that a dialup connection is being initiated from Analogmodem 1/0 with the telephone number being 660004.
3. Check whether the outgoing traffic statistics on Analogmodem 1/0 are increasing. If not, install the AM module in another slot. If the AM module still cannot work normally, it means that the AM module is faulty, and you need to replace the AM module.