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The new ZyXEL modems are not intended to be just a ZyXEL with a faster 
protocol.  They are intended to be a new GENERATION of ZyXEL modems.  As 
such, they will have some additional features.  There seem to be two at
least two new models -- a V.34 model and a ISDN upgrade for the V.34
models.  Currently, the feature set of the new modems appear to be:

 1] ZyXEL V.34 Modem
    ================

    Main Features:

    * ITU-T V.34 28,800bps to 2,400bps
    * ZyXEL 19,200bps mode
    * ZyXEL 16,800bps mode
    * ITU-T V.32bis/V.32/V.23/V.22bis/V.22/V.26bis/
    * ITU-T V.33/V.29/V.27bis (L models only)
    * ZyCellular mode
    * MNP 3-4-5, V.42/V.42bis, V.42 SREJ
    * Flash EPROM for downloadable firmware upgrade
    * ZyXEL parallel port interface
    * 14,400bps V.17 and V.29/V.27ter G3 FAX
    * EIA Class 2/2.0 and Class 1 Fax Commands
    * FAX scan line error report
    * 2/3/4-bit ADPCM voice compression
    * Microphone/Speaker voice interface
    * Versatile telephony functions
    * Universal data dump
    * ISDN Upgradable (option for Elite series)


 2] ZyXEL ISDN Modem - A Seamless Transfer from PSTN to ISDN
    ========================================================

    The ZyXEL ISDN Modem sets new standards in performance and usability
    for ISDN applications. This universal communication platform supports
    the most highly integrated services over ISDN lines without
    sacrificing connectivity to today's more prevalent analog lines. It
    is backward compatible with PSTN and includes most of the fine
    features found in other ZyXEL fax/modems including V.34. The modem
    works with most existing communication software using existing ZyXEL
    AT commands. It also fully supports the current standard ISDN
    application interface, COMMON-ISDN-API versions 1.1a and 2.0. You can
    run all of today's commercially available ISDN applications.
    Upgrading to the ZyXEL ISDN Modem maintains your link to the analog
    world and prepares you for the digital world of tomorrow - today.

    The modem firmware handles both D and B Channels protocols. For
    D-Channel, it supports EDSS1, 1TR6 and NI1/NI2; for B-Channel, X.75
    SLP, V.120, V.110, and Bundle(128Kbps). Better yet, the modem is
    ready for new developments. It has a 8 Mbit flash EPROM that allows
    you to conveniently download and program the modem with new
    protocols using a PC.

    A special compression engine supports V.42bis compression on the
    B-Channel at full speed over ISDN lines. Applied with X.75, V.120, or
    the Bundle protocols, this translates to up to a half-megabits per
    second transfer rate. (That's almost 4-Megabytes per minute!)

    The ISDN Modem has a full feature A/B adapter (analog port) that
    recognizes standard DTMF tones and generates a standard ring signal
    to the connected device. It also generates metering pulses (16KHz for
    Germany and 12KHz for Switzerland) according to the Charging
    Information it receives. If you want, you can use one B-Channel for
    voice communications while sending data over the ISDN through the
    other.

    The key features of the ZyXEL ISDN Modem are:

    * Full compatibility with both ISDN and PSTN
    * Two application program interfaces:
      . ZyXEL ISDN AT Commands
      . CAPI 1.1a and 2.0
    * Supports AT&T 5ESS, NT DMS100 D-Channel protocols (N. American models)
    * Supports 1TR6 and EDSS1 D-Channel protocols (European models)
    * Supports X.75, V.110, V.120 and Bundle(128Kbps) B-Channel protocols
    * Easy upgrade path using flash EPROM memory
    * V.42bis data compression using the X.75,V.120 and Bundle B-Channel
      protocols.
    * High speed serial/parallel DTE interface
    * Full-feature A/B adapter
    * Digitized voice capability
    * Asych to sych PPP support
    * Data encryption via DES
    * Embedded protocol analyser with color(ANSI) display
    * Supports NetWare CAPI Manager
    * 8-MB DRAM for on-board fax receiving (optional)


Release of the rackmount versions will follow after the standalone versions.


Data:
. V.34 (28.8/26.4/24.0/21.6/19.2/16.8/14.4/12.0/9.6/7.2/4.8/2.4/1.2/.3 kbps)
  data transmission
. V.32bis (14.4, 12.0, 9.6, 7.2 kbps) data transmission
. V.32 (9.6, 4.8 kbps) data transmission
. V.22bis (2.4 kpbs) data transmission
. V.22 / Bell 212A (1.2 kbps) data transmission
. V.21 / Bell 103 (0.3 kpbs) data transmission
<*info below may be inaccurate*>
. V.23 (1.2/0.075 kbps) data transmission
. V.33 (14.4, 12.0 kbps) data transmission (L models only)
. V.29 (9.6, 7.2, 4.8 kbps) data transmission (L models only)
. V.27ter (4.8, 2.4 kbps) data transmission  (L models only)
. V.27bis (4.8 kbps) data transmission (L models only)
. V.26bis (2.4 kbps) data transmission 2 wire half duplex
<*info above may be inaccurate*>
. Cellular (14.4, 12.0, 9.6, 4.8 kbps) data transmission using
  ZyCellular protocol
. ZyX 16.8 and ZyX 19.2 kbps data transmission speeds
. V.42bis and MNP 5 data compression
. V.42 and MNP 3, 4, 5 error correction
. V.42 selective reject (SREJ)

DTE:
. Serial DTE interface (460.8 kpbs)
. Parallel port DTE interfaces.
. Automatic Speed Detection (AT Autobaud)
. V.25bis Autodial
. Sychronous or asychronous operation

ISDN:
. ISDN upgradeable (Elite 2864, & Elite 2864L models), or
. ISDN capable (Elite 2864I models)
. Supports D and B channel protocols
. D channel supports AT&T 5ESS, 1TR6, NT DMS-100, EDSS1, and NI-1 standards
. B channel supports X.75 SLP, V.120, and V.110 protocols
. Bundling of two B channels is supported
. Analog adapter recognizes DTMF tones, and generates standard ring signal

Fax:
. V.17 fax transmission/reception speeds (14.4 kbps)
. V.29 fax transmission/reception speeds (9.6 kbps)
. V.27ter fax transmission/reception speeds (4.8 kbps)
. Connection with a printer and an optional 8 Mb DRAM module allows the
  faxmodem
  to print incoming faxes automatically without a computer.
. Error Correction Mode (ECM) supported
. Class 1, 2 and Class 2.0 fax operation supported

Voice:
. Voice recording in 2-, 3-, 3-new, 4-bit ADPCM sound formats at 9,600,
  19,200, 28,800, 30,720, 38,400 bps respectively
. Microphone and speaker jacks for recording and playback of voice recordings
 
Other:  
. Remote configuration
. Call-back security with password protection
. 8 Mbit FLash EPROM for easy ROM upgrades
. Decodes CallerID information
. Distinctive ring detection
. Detection of DTMF, dial tone, answer tone and fax tones
. Uses a Motorola 68030 processor and two Digital Signal Processors (DSPs),
  totaling 30 MIPS of computing power

The 2864 will incorporate all the features of the 1496.

<more work needed here>