Technical Information
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    (These documents are provided electronically for the express purpose of assisting design engineers, software developers, and end-users with frequently asked questions about Rockwell products.)

    Rockwell does not manufacture modems,
    just the chipsets that go into many modems.

    For specifics about hardware, software, drivers, or updates it is best to consult the actual Modem Manufacturer directly.

    Hardcopy versions of the following documents (and other documents) can be obtained by contacting your local sales office .

    Note: Many links in this area will open new Windows.

    General Rockwell V.90 Modem Information

    Please see: V.90 Modem - General Information Page

    Generic Modem User's Guides

    Generic Modems User's Guides are available in HTML format. Although most modems will NOT have all of the features described in a User Guide, the guides offer typical information for the generic modem design that Rockwell offers to modem manufacturers. Modem manufacturers often make significant changes or custom designs using Rockwell chips, so the information may be incorrect for your specific modem.

    Rockwell's AT Command Manuals

    Windows 95 / NT 4.0 Configuration Files/Drivers
    for Rockwell Chipset Based Modems

    Some hints on Configuring Generic Modems under Win95 or Win NT 4.0

    Designer's Guides

    Rockwell Modem Chips - Designer's Guides

    RPI / WinRPI / WinRPI95

    WinRPI95 (Windows 95)
    (includes ROKRPISH.VXD for JUNO users)

    WinRPI (for Windows 3.x)

    WinRPI (for DOS)

    • PortInfo from CTS is a DOS serial port utility that may help you identify RPI modems and COM port conflicts.
    • DOS RPI - Information on software versions that support RPI

    AOL tips for RPI users

    Modem Technical Support Help files

    Speech Compression - DigiTalk

    For Specifications and Source Code, click here.

    H.324 / Videophone / Video Conferencing

    Rockwell H.324 Videophone Solutions

    DSVD / ASVD / Voiceview / AudioSpan

    A quick tutorial...
    • VV - Voice View
      Alternating (not simultaneous) Voice and Data

    • ASVD - Analog Simultaneous Voice and Data
      QADM techniques are used to mix analog voice (audio) and digital data together into one modulation.

      • V.61: An ASVD standard from the ITU with a data rate of 4.8 Kbps plus voice.
      • ML144: Similar to V.61 but with extensions to allow data rates upto 14.4 Kbps.
      • ML288: Sometimes known as Audiospan or V.34Q, with data rates up to 28.8 Kbps.

    Rockwell's ASVD products are known as AudiSpan.
    Check out the
    AudiSpan FAQ !

    • DSVD - Digital Simultaneous Voice and Data
      Voice (audio) is digitized and mixed with the digital data stream.

      • The ITU standard is made up from several Recommendations: V.70, V.75, V.76, G.729
      • The SIG DSVD was introduced in early 1995 and uses the DigiTalk coder.
    Some links...

    Jumper / DIP switch settings

    Since Rockwell does not make the complete modem hardware (board) -- just the chipset -- Rockwell does not have any information about Jumper or DIP switch settings.
    If you don't have documentation on jumper or DIP switch settings, the best you can do is experiment and then examine the results with PortInfo (

    Some typical COMM port settings:

    Port# IRQ I/0 address
    COM1 4 3F8 hex
    COM2 3 2F8 hex
    COM3 4 3E8 hex *
    COM4 3 2E8 hex *

    * = standard / default

    V34Fax / SuperG3 / Faxing at up to 33.6 Kbps

    Designer's Guide - Order No. 1069
    R288F V.34 Fax/V.17 Fax Modems

    ADPCM / VAPI / Rockwell VOICE format

    For Specifications and Source Code, click here.

    Fax Class 1 vs. Class 2

    Does it Matter?


    DigiTalk (Full Duplex) SpeakerPhone White Paper

    Rockwell Semiconductor Systems Web site links:

    Careers International Search

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