Description of the Modem Settings Key in the Windows Registry

ID: Q250649

The information in this article applies to:

Microsoft Windows 98
Microsoft Windows 98 Second Edition
Microsoft Windows 95

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY

This article describes the Modem Settings registry key in the Windows 95/98 Registry. This key is located in

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Modem\xxxx\Settings

MORE INFORMATION

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).
The Settings key contains commands for configuring various modem settings. After the Init key commands are sent, Windows builds a dynamic configuration command string by concatenating various entries shown in the following table. The command depends on the settings selected in the modem's properties.

The following table describes the entries under the Settings registry key:

Subkey Description Example

Prefix Configuration command prefix AT

Terminator Configuration command suffix <cr>

DialPrefix Dial command prefix D

Dial_Pulse Use pulse dialing P

Dial_Tone Use tone dialing T

Blind_Off Detect dial tone before dialing X4

Blind_On Do not detect dial tone before dialing X3

CallSetupFailTimeout Specify call setup time-out S7=<#>

InactivityTimeout Specify inactivity time-out S30=<#>

SpeakerVolume_Low Low speaker volume L1

SpeakerVolume_Med Medium speaker volume L2

SpeakerVolume_High High speaker volume L3

SpeakerMode_Off Speaker always off M0

SpeakerMode_Dial Speaker on during dial and negotiation M1

SpeakerMode_On Speaker always on M2

SpeakerMode_Setup Speaker on only during negotiation M3

FlowControl_Off No flow control &K0

FlowControl_Hard Hardware flow control &K1

FlowControl_Soft Software flow control &K2

ErrorControl_Off Error control disabled (normal mode, not direct) +Q6S36=3S48=128

ErrorControl_On Error control enabled (auto reliable) +Q5S36=7S48=7

ErrorControl_Forced Error control required to connect (reliable) +Q5S36=4S48=7

ErrorControl_Cellular Cellular protocol enabled \N3-K1)M1-Q1*H1

Compression_On Compression enabled S46=138

Compression_Off Compression disabled S46=136

Modulation_CCITT Use CCITT modulations for 300 and 1200 bps B0

Modulation_Bell Use Bell modulations for 300 and 1200 bps B1

SpeedNegotiation_Off Connect only at default modem speed; do not fall back N0

SpeedNegotiation_On Use lower DCE speed to connect, if necessary N1

Additional query words:

Keywords : kbhw win95 win98 win98se
Version : WINDOWS:95
Platform : WINDOWS
Issue type : kbinfo