Modem Problems

The following may be symptoms of modem problems:

• Network does not come up

• X.25 link layer does not come up, or does not stay up

• The message xmit hung appears in the console

• No data is being sent and or received

Check the following:

1. Make sure your modem is correctly configured. Check your modem's documentation.

2. If you still have a connection, check the Transmit and Receive Data lights on your modem: with LAPB transmission, these should always be on.

3. If you have a connection, use a breakout box at the Sun (not the modem) end of the connection to check that RS-232-C pins 2, 3, 4, 5, 6, 7, 8, 15, 17, and 20 are functioning. Pay particular attention to the Transmit Clocking and Receive Clocking pins, 15 and 17. If the lights corresponding to these pins are not lit, it indicates that the local and/or remote modems are not supplying clocking. Notify the remote end and use your modem's documentation to perform troubleshooting.

4. If you are using a null modem connection, one side should be a DTE, the other a DCE and one or both sides must supply clocking. See "Building the Null Modem Cable" for instructions on setting up a null modem connection.