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Symptom(s):
Modem makes no sound
Cause:
- Incorrect AT Command Register setting
- Incorrect BIOS setting
- Incorrect Keyboard setting
Solution:
First, obtain and apply the latest drivers and firmware for the Xircom modem.
NOTE: Xircom® modems do not contain speakers of any kind. The modems pass the tones to the computer where they are output through the computer speakers. The computer Sound Card or sound device has nothing to do with the output of these tones. The modem sounds are passed through the Alarm Warning device in the system BIOS where the Alarm volume setting and the Computer Beep setting control them.
The modem tones that are passed to the computer can be manipulated using the following AT commands. To alter modem sound settings, edit the modem initialization string and add one of the following commands:
M0= Speaker always off
M1= Speaker on until carrier detect (this is the default)
M2= Speaker always on
M3= Speaker on after dialing
L0= Low speaker volume
L1= Low speaker volume
L2= Medium speaker volume (this is the default)
L3= High speaker volume
For example, the initialization string AT&FM1L3 increases the volume to high, while turning the sound off after a connection is established.
To implement these changes globally in Microsoft Windows*, add the initialization string to the modem Extra Settings box as follows:
1. In Windows 95, 98, NT and Me, click Start, select Settings and click Control Panel.
2. Double-click the Modems icon.
3. Click the Xircom modem entry and click Properties.
4. Click the Connection tab and then click Advanced.
5. In the 'Extra Settings' box, type the initialization string.
The Extra Settings box is in a different location for Windows 2000:
1. In Windows 2000, click Start, select Settings and click Control Panel.
2. Double-click the Phone & Modems icon. Select the Modem tab.
3. Highlight the Xircom modem and click Properties.
4. Select the Advanced tab.
5. In the 'Extra Settings' box, type in the initialization string.
Note: In the 'Extra Settings' box, it is not necessary to precede the initialization string with the AT command. However, the AT is required when performing changes from a terminal command line prompt.
As stated above, modem sound is processed through the computer alarm system. This system is enabled in the BIOS. In most systems there will be a BIOS setting for Alarm Volume (low, medium, and high) and for Computer beep (enabled/disabled). Some computers allow these settings to be modified through a hardware setup utility in the Program Group or through keystroke combinations at the keyboard. Consult the computer User's Guide for assistance with this effort. A couple of examples of modifying computer volume are included in the following paragraphs.
Some Toshiba computers have an 'Alarm Volume' setting in the system BIOS. We have seen similar speaker difficulties resolved by setting this parameter to 'high'. To access the BIOS menu, clean boot the computer, change to the DOS directory and start the TSETUP.EXE program (type TSETUP at the C:/DOS command prompt and press Enter).
Computers also use keystroke combinations to directly access various BIOS functions including alarm volume. For example:
Fujitsu - FN+F3
NEC - FN+F6 (works in 4 stages: Off, Low, Medium, High)
Toshiba - FN+F4
Micron Trek II - FN+F1
Many newer computers have a System Utility that is now used to easily modify the alarm volume and computer beep. This utility can be found in the Program group or Control Panel. The alarm volume and beep are in one area and, in some cases, additional sound settings are under Power Management. These settings are specifically for the battery alarms, but they effect modem sound as well.
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This applies to:
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