KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q163086: IBM MWave 28800 Modem Does Not Function Properly with RAS

Article: Q163086
Product(s): Microsoft Windows NT
Version(s): WINNT:3.5 3.51
Operating System(s): 
Keyword(s): kb3rdparty kbhw kbHardware
Last Modified: 09-AUG-2001

-------------------------------------------------------------------------------
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 kbHardware 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : WINNT:3.5 3.51
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.