From: mpye@netcom.com (Michael Pye)
Subject: Modem Summary - part 2
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Wed, 27 Jan 1993 12:51:35 GMT

U-1496 Front Panel Arrow Keys

The four arrow keys are for the panel operation manipulation.  They 
are for intuitive menu tree operation and status display. 



U-1496/U-1496+ Rear Panel 

The following explains the connectors and switch on the rear panel.

      POWER     Power switch, turns the U-1496 ON or OFF.

      POWER     Input terminal for power adapter.
      JACK
                NOTE: Use only ZyXEL power adapter supplied with the unit.
                Connecting any other adapter will result in inoperability
                of the U-1496, and could cause serious damage to the U-1496.

      LEASED    Leased-line JM8 terminal jack, for connection to a 2/4
      LINE      wire leased line.

      DIAL-UP   Dial-up line  RJ11  terminal jack, for connection to a 2<197>
      LINE      wire dial-up line.

      PHONE     Telephone line RJ11 terminal jack,  for  connection to a 
                telephone set.

      EIA-232D  Serial  port  DB25S  connector,  for connection to the 
                serial port of DTE.  Pin assignments are presented in 
                appendix A for your reference.




U-1496E/U-1496E+ Front Panel

There are 12 LED indicators and two switches.

U-1496E/U-1496E+ Front Panel Indicators

LED indicators

HS      High Speed indicator, lights up when modem is in V.32 or 
        V.32bis mode.

AA      Auto-Answer indicator, lights up when modem is in the Auto-
        Answer mode; flashes when modem rings.

CD      Carrier Detect indicator, lights up when a valid carrier is pre-
        sent on the line.

OH      Off-Hook indicator, lights up when modem is in data mode
        or off-hook, and goes out when modem is in voice mode or
        on-hook.

DTR     Data Terminal Ready indicator, lights up when the DTE or
        Computer indicates that it is ready for communication.

DSR     Data Set Ready indicator, lights up when modem is ready
        for communication.

CTS     Clear To Send indicator, lights up when modem can accept
        data for transmission.

TXD     Transmit Data indicator, flashes when DTE/Computer is tran-
        smitting data on the serial port.

RXD     Receive Data indicator, flashes when the DTE/Computer is
        receiving data on the serial port.

EC      Error Control indicator, lights up when modem is operated
        in an error control mode like MNP-4 or V.42.

SQ      Signal  Quality  indicator,  lights  up  when signal  quality  is
        good; flashes when it is on margin.

TST     Test indicator, lights up when modem is in a test mode.



U-1496E/U-1496E+ Front Panel Switches

VOICE/DATA      A toggle switch that toggles the modem on-line
                (off-hook,  DATA mode)   or   off-line   (on-hook, 
                VOICE mode, the telephone  set  is  connected
                to the line).

ANS/ORG         A locked switch,  it determines the modem is in
                originate    mode   or  answer   mode  when   the
                modem goes  off-hook  by  toggling  the VOICE/
                DATA switch. Locked up position  means answer
                mode and locked down position means originate
                mode.


U-1496E/U-1496E+ Rear Panel 

U-1496E/U-1496E+ rear panel is the same as the U-1496/U-1496+
except that U-1496E/U-1496E+ does not have the leased line jack. 
Refer to the U-1496/U-1496+ rear panel explanation for the U-1496E/U-1496E+ 
rear panel information.

--

    Steve Pershing, SysAdmin  <sp@questor.org>    The QUESTOR Project
  FREE access to Environ, Sci, Med, & AIDS news, and more.  [also UUCP]
    on a ZyXEL-U1496S+  =>  v.42bis, v.32bis, v.33, up to 16,800bps.
                 -=-         -=-         -=-         -=-
   Fones: (+1 604)  Data: 681-0670  Telefax: 682-6160  Voice: 682-6659




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


          Voice Mode + Ultra High Speed 16800 bps FOR
                U-1496E and U-1496E PLUS
     ****************************************************

 ZyXEL Q & A List
==============

Q-1, What is ZyXEL proprietary ultra high speed 16800 bps ?
-------------------------------------------------------------
Ans : ZyXEL 16800 bps scheme is full duplex, not like USR's HST design
      which is only one way.
      ZyXEL 16800 bos mode is an extesion of V.32bis, it has fast
      speed shifting downward to and upward from V.32bis speeds according
      to line condition.

Q-2, May we know more detail on U-1496E Plus model ?
----------------------------------------------------------------
Ans : U-1496E Plus model has a 68000-16 running at 20MHz.  It
      has larger SRAM space for digital signal processor (DSP). This
      provides the power and flexibility for higher 19200 bps speed.
      The possibility of higher speed depends on the complexity of
      the scheme, computation power of the modem, and architecture
      flexibility of the modem. ZyXEL can support 16800 bps on all
      U-1496 series models now (except U1496B which does not have
      1M sockets installed), for higher speed , we think the modem
      needs more computation power so that not to degrade the performance.
      We need more DSP memory to accommodate a more complicated scheme.

Q-3, Can user upgrade U1496E model into U1496E Plus model ?
------------------------------------------------------------------
Ans : Due to some hardware difference, ZyXEL's current U1496E is not
      upgradable to PLUS model.  It will be too messy to do the
      hardware modification.  The firware for the U1496E and E PLUS
      is not inter changeable.

Q-4, What is your new feature --Caller ID in ZyXEL modem ?
------------------------------------------------------------
Ans : Normally called Caller Number Delivery (CND), this is a service
      feature available from phone companies in some parts of USA and
      in some other countries. With this service, the phone company
      sends calling party information along with ring signal to the
      called party.  The major part of this information is the telephone
      number of the calling party or so-called caller ID.  ZyXEL modems can
      detect and report caller ID.

Q-5, What is Distinctive Ring in your ZyXEL product ?
---------------------------------------------------------
Ans :This is a service feature available from some phone companies
     in some area of USA and other countries. You can have several
     phone numbers on the same subscriber phone line. The phone company
     sends a different ring signal for each phone number assigned to the
     same line.
     You can have your phone equipments answer only to a certain type of ring
     corresponding to a certain phone number.  ZyXEL modems can be set to
     answer on one of or a combination of 4 types of ring signal. There is a
     problem that each country may have a different specification for
     different ring types.

Q-6, What is Digitized Voice and CELP technology ?
--------------------------------------------------------------------------
Ans : Modem with digitized voice capability can digitize the incoming
      voice message and the computer can store it as file.  The modem can
      also playback a recorded digital voice message either locally or to
      the line as an announcement.
      Digital voice message needs speech compression to reduce the storage
      requirement. This speech compression is done in real time by the modem
      and it does the decompression in playback.  A simple voice capability
      using ADPCM algorithm can reduce speech data rate to 1/2 or 1/3.  We 
call
      it advanced voice capability when it can reduce speech data rate even
      further with advanced algorithm like CELP (Code Excited Linear 
Prediction)
.

Q-7, May we know more detail on VOICE mode ? Can it be used as an
     answering machine ?
--------------------------------------------------------------------
Ans : In VOICE mode, the modem will digitize and compress the incoming voice
      message from the telephone line and send it to the computer for storage
      or forward.  It will also playable the recorded voice message for local
      listening or as announcement to the phone line. It will also detect DTMF
      tone signal during recording that the computer program can detect and
      respond to the tone signal from a push-button phone set. The simplest 
use
      is as a digital answering machine or used in voice mail system. With 
voice
      mode, you combine modem, fax, and voice capability in one single device.

Q-8, When will V.fast standard be included in ZyXEL modems ? How fast will
     the standard be ?
-----------------------------------------------------------------------------
Ans : We do not know when the V.fast standard will be settled and ZyXEL can 
not
      promise when we will implement it. We must have the detail of the 
standard
      before we can have an estimation. There are only talking (paper
      presentation) but not a draft standard about what speed will be included
      in V.fast.  Proposed speed include 24k bps, 25.6k bps, and 28.8k bps.
      You need a perfect line to get that high speed , most probably you can
      only get 19.2k bps speed on the real line connection.

Q-9, How to process U-1496 series modem firmware upgrade with 1Mbit EPROM ?
----------------------------------------------------------------------------
Ans : The 1Mbit EPROM has 32pins while the 512K EPROM has only 28 pins.
      Among the four additional pins the 1M bit EPROM has, only pin 2 and
      pin 32 need signal correction, pin 1 and pin 31 have no connection
      inside the chip. If you put 1Mbit EPROM chip in front of you with
      pin 1 on the lower left corner, the 28 pins on the right have the
      same signal connection as the 512K EPROM chip.

      There are three cases for 1Mbit firmware upgrade:

      (1) There are already a pair of 32pin sockets installed on the modem 
main
          board.
          Just install the 1Mbit EPROMS in the 32-pin sockets.  Note that 
there
          are no pin sockets for pin 1 and pin 31, no connection is needed for
          those two pins.

      (2) 28-pin sockets on the modem board but pin holes on the board exist 
for
          pin 2 and pin 32.
          Solder in two single-pin sockets for pin 2 and pin 32 and you can
          install the 1M bit EPROM.  You need some skill to solder the 
single-pin
          socket.
          It is better to use a SIP 8-pin single-row pin socket as an 
alignment tool.
          Plug the single-row pin socket into the existing socket and the 
single-pin
          socket you want to solder and it will hold the single-pin socket in 
place
          while you solder.

      (3) 28 pin sockets on the modem board and no pin hole exists on the 
board for
          pin 2 and pin 32.
          We do NOT recommend to install 1Mbit EPROM on this case.  You can do 
the
          following hardware modifications but it will void the warranty and 
it is
          difficult to remove and reprogram the EPROMS.

         (a) Solder a jump-wire to short pin 32 and pin 30 of the EPROM.
         (b) Install the 1Mbit EPROMS on the 28-pin sockets with the left 
4pins
             outside the sockets.
         (c) Solder a wire to connect pin 2 of the EPROM to pin 45 of the 
MC68000
             and solder a wire to short pin 30 and pin 32 of EPROM.

Q-10, Will it be possible to upgrade ZyXEL to V.fast just with changing the
     firmware ?
----------------------------------------------------------------------------
Ans : ZyXEL does not promise any of this possibility. We can not promise a 
thing
      that we do not know what it really is.  V.fast may become too 
complicated
      that we need to develop a new model for it.

Q-11, May we know the difference between ZyXEL 16800bps and US Robotics HST
      16800bps ? Is it campatible with HST 16800 ?
----------------------------------------------------------------------------
Ans : HST 16800bps is USR's own protocol and is not compatible with any other
      modems. HST is a one-way high speed modem, ZyXEL 16800bps is a
      full-duplex  high speed mode, it is  an extention of V.32bis 14400bps 
and
      will automatic shift speed downward to or upward from V.32bis speeds.

Q-12, Will it be able to detect data/fax/voice under Frontdoor/Binkley at the
      same time?
----------------------------------------------------------------------------

Ans : It is difficult to include voice in auto-detection because there is no
      standard and there is no way to specify how human voice should act or
      response to a phone call. A commom method is to have the answer party
      play a answering message first and check response. The problem is that
      some data/fax devices may be confused by this voice message and not
      connected and normal data/fax connection will take longer. ZyXEL is
      working on a optimum way to do it that it will have a minimum missing
      rate or connection delay.

Q-13, How often is there released new ROM/ZFAX versions?
----------------------------------------------------------------------------

Ans : Usually, we have a new version when we have new ROM code which is
      different from the previous version. Many version are for beta tester 
and
      many intermediate versions have some small changes/additions for some
      specific condition or use and most users are not affected. It is 
strongly
      suggested that normal users should not bother to update to each version
      unless its use is affected. Update to a major formal release once every
      2-6 month is enough. We will differentiate a major release from some
      intermediate versions to save user/dealer's trouble. Software version is
      much easier for user to update. Since we were doing major Zfax2.0 
update,
      we didn't have so often a zfax version in the past.



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


        ZyXEL Tech support BBS/voice numbers:

ZyXEL, Tawain
        BBS: 886-35-787045
        Voice: 886-35-783942
        FAX: 886-35-782439

TCL Technology, Hong Kong
        BBS: (852) 574-6040
        Voice: (852) 891-3281
        FAX: (852) 891-6335

ZyXEL, USA (formerly 0/1 Networking)
        BBS: 714-693-0762
        Voice: 714-693-0808
           or: 800-255-4101
        FAX: 714-693-8811

OCOMP Optimizing COMPuters, Canada
        Voice: (416) 534-1508
        E-Mail: gvb@telly.on.ca


Newsgroups: comp.dcom.modems