Microcom DeskPorte FAST EP 28.8 Not Compatible With ES Model

• Microsoft Windows NT operating system version 3.1
• Microsoft Windows NT Advanced Server version 3.1
• Microsoft Windows NT Workstation version 3.5
• Microsoft Windows NT Server version 3.5
• Microsoft Windows for Workgroups version 3.11

SYMPTOMS

When you make a call from Windows NT 3.5 Remote Access Service (RAS), and your EP modem is configured as an ES modem, the call fails. Event Id 20015 (indicating a hardware failure) is written to the system log.

Windows for Workgroups 3.11 did not ship with support for any Microcom DeskPorte v.fast modems. However, if the [Microcom DeskPorte FAST ES 28.8] modem section from Windows NT is appended to the Windows for Workgroups 3.11 MODEM.INF file, hardware failure symptoms occur when you attempt to make a call.

CAUSE

The Windows NT 3.5 MODEM.INF section for the Microcom DeskPorte FAST EP 28.8 is not compatible with the Microcom DeskPorte FAST ES 28.8 (which is supported in Windows NT 3.5).

RESOLUTION

Windows NT

To correct this problem under Windows NT, either use the MODEM.INF section for the Microcom DeskPorte FAST (which is a different from the ES model) or use the [Microcom DeskPorte FAST EP 28.8] section provided below.

Although the MODEM.INF section for the Microcom DeskPorte FAST works for the EP model, it has to be manually selected in Windows NT since RAS Setup in Control Panel (the Network) not automatically detect the modem (because the EP modem identifies itself with a different string). After you select the Microcom DeskPorte FAST, restart RAS.

The new [Microcom DeskPorte FAST EP 28.8] section below works for most EP modems and allows Control Panel to automatically detect the correct modem.

NOTE: If your EP modem has a ROM revision that responds to the ATI3 detection command with a different string than the EP modems used in Microsoft's tests, your modem will not be detected.

Windows for Workgroups

To use the EP model under Windows for Workgroups version 3.11, append the below [Microcom DeskPorte FAST EP 28.8] section to your MODEM.INF file after you remove the following two lines:

   DETECT_STRING=ATI3<cr>
   DETECT_RESPONSE=DeskPorte 28.8P 2.0

General Information

The EP and ES MODEM.INF sections differ as follows:

• The hardware flow control command is different in the EP version:

      - The EP uses: \Qx
      - The ES uses: &Kx
  

  where x represents a number that modifies the command.

• The DETECT_RESPONSE strings (after issuing ATI3) are different:

  The EP uses: DeskPorte 28.8P 2.0 The ES uses: DeskPorte V.FC

;---------------------------------------- [Microcom DeskPorte FAST EP 28.8] ; NOTE: this EP version is different from the ES version in terms of ; hardware flow control and DETECT_RESPONSE= strings. CALLBACKTIME=10 DEFAULTOFF=compression MAXCARRIERBPS=28800 MAXCONNECTBPS=57600

<speaker_on>=M1 <speaker_off>=M0 <protocol_on>=\\N3 <protocol_off>=\\N0 <hwflowcontrol_on>=\\Q3 <hwflowcontrol_off>=\\Q0 <compression_on>=%C3 <compression_off>=%C0 <autodial_on>=ATDT <autodial_off>=ATD

DETECT_STRING=ATI3<cr> DETECT_RESPONSE=DeskPorte 28.8P 2.0

COMMAND_INIT=AT&F&C1&D2 V1 -M0 W1 S2=128 S7=55<cr> COMMAND_INIT=AT<speaker><compression><hwflowcontrol><protocol><cr>

COMMAND_LISTEN=ATS0=1<cr> COMMAND_DIAL=<autodial><phonenumber><cr>

;----------------------------------------