IBM MWave 28800 Modem Does Not Function Properly with RAS

ID: Q163086

The information in this article applies to:

Microsoft Windows NT Workstation versions 3.5, 3.51
Microsoft Windows NT Server versions 3.5, 3.51

SYMPTOMS

Some models of the IBM MWave 28800 modems do not work with Remote Access Service (RAS) and other communications software. However, the same modems sometimes appear to function properly with Windows Terminal or other communications software.

CAUSE

The IBM MWave 28800 modems are not on the Windows NT 3.51 Hardware Compatibility List (HCL). Windows NT detects these modems as generic 28800 modems, and may drop connections intermittently.

RESOLUTION

To resolve this problem, update the existing Modem.inf file in the %Systemroot%\System32\Ras directory by appending the following information:

;----------------------------------------
[Mwave 28800]
<speaker_on>=M1
<speaker_off>=M0
<autodial_on>=ATDT
<autodial_off>=ATX3D
<speaker_on>=M1
<speaker_off>=M0
<hwflowcontrol_on>=&K3
<hwflowcontrol_off>=&K0
<compression_on>=%C1"H3
<compression_off>=%C0"H0
<protocol_on>=\\N7
<protocol_off>=\\N0

CALLBACKTIME=10
DEFAULTOFF=compression
MAXCARRIERBPS=28800
MAXCONNECTBPS=57600

DETECT_STRING=ATI3<cr>
DETECT_RESPONSE=IBM Mwave Modem v3.0

COMMAND_INIT=AT&F&C1&D2 V1 S0=0 S2=128 S7=55<cr>
COMMAND_INIT=AT<hwflowcontrol><protocol><compression><speaker><cr>
COMMAND_DIAL=<autodial><phonenumber><cr>
COMMAND_LISTEN=ATS0=1<cr>

IBM also suggests that you set the PORT flow control to hardware and click to select FIFO under advanced settings.

STATUS

This problem occurs when you use Windows NT 3.5 or 3.51 and IBM MWave modems.

Additional query words: prodnt

Keywords : kb3rdparty kbhw ntras nthw NTSrvWkst
Version : WINNT:3.5 3.51
Platform : winnt
Issue type : kbprb