                                         ZyXEL Communications Services GmbH.
                                                     edited by Manfred Recla
                                                           November 24, 2000



              Release Note for the ZyXEL modem:  U-90E
              Version 1.04                  10/02/2000
              ========================================
 

 1.) fixed bugs and firmware modifications:
-------------------------------------------
        - Fixed the problem that can not detect RING and DTR drop when 
          DTE sends data continuously.
        - Improved Russian CallerID detection reliability.
        - Fixed the problem with false ring detection when dialing on 
          parallel telephone set.
        - Fixed the BUSY detection unstable in Russia.
        - Fixed that undesired impulses where produced in pulse dail out.
        - Fixed the MS-FAX compatibility issues that modem fail to
          receive or send pages.
        - Fixed the FAX issues with NEC-FX-220 fax machine, that can not
          received the 2nd page.
        - Improved Make/Break ratio accuracy for pulse dial.
        - Improved the connection stability for V.90 mode.
        - Fixed the FAX issues can not be received in Windows 2000.
        - Fixed the V.90 bug that link rate was unstable when FRN happened.
        - Improve V.90 performance and noise immunity.
        - Fixed the problem that modem traffic blocked when used 3 wire
          (TX/RX/GND) RS232 cable.
        - Fixed FAX Class 2.0 and FAX Class 2 DIS/DCS parameter exchange 
          error.
        - Fixed Russia ring detection fail bug.
        - Fixed the compatibility problem with TAINET T288C.
        - Sync mode burst error after long time used.
        - Compatibility problem with CISCO server
        - FAX regression problem.
        - Test mode problem.


 2.) added new feature:
------------------------
        - Added the DTMF CallerID feature.






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


              Release Note for the ZyXEL modem:  U-90E
              Version 1.03                  03/02/2000
              ========================================


1.) Fixed bugs:
  Modem can not be used when country code is set to 230 (= Russia)


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




              Release Note for the ZyXEL modem:  U-90E
              Version 1.02                  01/12/2000
              ========================================

       


1.) Fixed bugs:
---------------
  1.1 Pressing D/V key when power on will set country code to 255.


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




              Release Note for the ZyXEL modem:  U-90E
              Version 1.01                  12/31/1999
              ========================================


1.) Fixed bugs:
---------------
  1.1   ATI19 will not report kernal version anymore.
  1.2   Fax Class 2/2.0 bug:
          - will not report 0x11 after connect .
          - reports two '0d 0a' before 'OK'.
  1.3   ATD0Wxx will let modem hang when s41.4=1.
  1.4   Can't do remote configuration with ZyXEL's previous modem
        series (U1496xx, Omni 288s, Elite 2864, U336xx).

2.) Added new function:
-----------------------
  2.1   v1.01 now supports the "CE" approved hardware model.


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




   Release Note for the 4th generation of ZyXEL's modem:  U-90E
   Version 1.00 -> FCS (=First Customer Shipment)         12/02/1999
   =================================================================



1.) Fixed bugs:
---------------
  1.1   Turn off the HS and DSR LEDs when entered the kernel mode.
  1.2   Fixed the multi-auto detection fail for fax function.
  1.3   Fixed the bug of busy tone detection fail in Russian.
  1.4   Modem will false alarm to FRN after long time use at V.22bis mode.
  1.5   When S16=3 the modem will force CTS low.
  1.6   ATI18 report will 'eat' one line.
  1.7   The modem is awaited to connect at none error control mode when 
        using the V.22bis protocol. (about 1/10 probability).
  1.8   If DTE doesn't provide clock during handshaking when synchrous 
        external clock mode, the modem may initial FRN or retrain after
        data state.
  1.9   The FRN counter is not zero after long time connection at V.22bis 
        mode when bk-bk.
  1.10  The line status shall not clear when leased line drops.
  1.11  Synchronous mode (AT&M3) can't transmit data.
  1.12  Improve the "NO CARRIER" problem after long time file transfer.

2.) Add new functions
---------------------
  2.1   Add Russian Caller ID.
  2.2   Modify the retrain procedure for Russian V.90 mode. That will
        force to V.34 mode if double handshaking in V.90 mode.

3.) Known Bugs list:
--------------------
  3.1   If S16=3 is stored in profile, the CTS will go low after DTR drop
        when the setting is with '&D3' 
  3.2   The modem will enter kernel mode after issue 'ati19' command if 
        the used kernel version is older than release version '1.01'
