To troubleshoot the modem, disable the modem port e.g.: Ports > Auxiliary Ports > ttyM1 Status: Disabled Then execute "sptest" as root and choose 1. Single Port Operations -> 1. Port Conversation -> choose your modem port -> enter port number -> enter baud rate Now you are directly connected to the modem and can use the Hayes command set to communicate with the modem. E.g. AT to check if the modem is listening to commands and on external modems to verify if the cabling is correct. Modem will answer with OK. ATA to answer an incoming call (will only work after a RING). Modem will answer with CONNECT once connected or with an error if connection cannot be established. This can take several minutes. The general sequence is: AT the modems answers with OK RING -> someone is calling ATA we get a connection message once connected A CONNECT message is mandatory. Any other answer instead of CONNECT means that the modems are unable to connect. As there is no configuration active at this low level troubleshooting steps there cannot be a configuration issue on the Avocent device. NO CARRIER during synchronization means that the caller did hang up the line during synchronization. It's an issue on the caller side, not on the ACS. Based on customer feedback it is related to bad line quality, incompatible modems or wrong timeout settings on the caller side. The timeout should be at least 180 seconds. No CONNECT message is an environment issue and not under the control of the Avocent device. To quit the test press CTRL+Q, ESC, ESC and do not forget to re-enable the modem port. Note: You cannot test the quality of a phone line for data communication by connecting a telephone to it. Voice needs a much lower frequency spectrum as data. You can only test it by connecting a standard modem with a PC to it, establish a data connection and transfer data over the connection.
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