Trouble Shooting - ZyXEL Communications Omni 288S User Manual

Dialing Indicator
The V32b LED will flash on and off for 1/2 second each to indicate that the
modem is dialing. This flash will continue after dialing until a carrier is detected.
Therefore, the V32b LED will also flash in leased-line modem connections when
one modem is trying to handshake but the other modem is not turned on.
Handshaking And Retrain Indicator
The V34 LED and V32b LED will alternatively flash on and off for 1/2 second
each to indicate that the modem is handshaking or retraining.

Trouble Shooting

The Omni 288S modem is designed to provide years of ultra high speed
satisfaction. In the unlikely event you encounter problems using your modem, the
tips in this section will help you to identify and resolve them. Most modem
problems are a result of incorrect cabling or settings within your communications
or fax software. This section provides a list of more common problems that you
may encounter, followed by likely solutions.
AT Command Set Problems
Problem
Your modem does not respond to AT commands.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. Check to see that your modem's COM port is not already assigned to another
installed serial device, such as a mouse or laser printer.
Problem
Your modem fails to execute AT commands.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. You may have omitted the characters AT from the beginning of the command
line. These characters must appear at the beginning of each command line.
3. You may have typed the commands when your modem was in data state
instead of the command state. To switch from data state to command state,
type the escape sequence code +++. To return to the data state, type ATO
and press Enter.
Chapter 13 - Diagnostics & Troubleshooting
13-4