Zyxel-communications U-336SA Bedienungsanleitung PDF herunterladen (Seite 149)

Diagnostics & Troubleshooting 135

Trouble Shooting

Your 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.

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Zyxel-communications U-336SA Bedienungsanleitung Seite 149