From: sp@questor.UUCP
Newsgroups: comp.sys.mac.hardware
Subject: Modem_w/FAX_CallerID_LCD_Display_up_to_16800cps
Date: 26 Jul 92 21:26:37 GMT

I  have in front of me,  a  ZyXEL U-1496S modem.   This is the  sort  of
state-of-the-art-modem  I  would have had my group design were  I  still
working in modem research at Gandalf Data.

It has a 2 line by 20  character LCD display, menu-tree programming from
the  screen  via 4 pushbuttons,  and implements a whole bunch  of  CCITT
protocols up to 14,400  v.32bis/v.42.bis, and v.17 FAX. Needless to say,
it  does both sync and async,  and even has modes for use with  cellular
and satellite.

(Presently,   the operation modes are:   v.33;  v.32bis;   v.32;   v.29;
v.27ter;  v.22bis; v.22; BELL 212A; G3 FAX according to T30, v.17,  v.29
and v.27ter; and most variants.)

What does the display do besides allow you to program all the registers?
Well,  you can not only see the incoming connect speed,  but also things
like:
        - Signal-to-noise ratio
        - Received Carrier Power Level
        - Phase Jitter (p-p degrees with .1 deg resolution)
        - Frequency offset between TX and RX freqs (in .1 Hz res)
        - Round-trip echo delay in (1/2400 sec)

          ...and a whole lot more.

After your communication session has finished,  you can even call up (by
an AT-command) a "Link Status Report" which will give you:

        - Chars sent; Chars rcvd; Octets sent; Octets Rcvd
        - Blocks sent; Blocks rcvd; Blocks re-sent;
        - Max Outstanding; Max Block Size;
        - Retrain requests; Retrains granted; Link duration;
        - T401 timeouts; T402 Timeouts; FCS Errors;
        - Round-trip delay; Xmtr under-run; Rcvr Over-run
        - Reason for disconnect.

With the latest ROM revisions, it handles Caller ID, 4 different ringing
codes,   and the maximum speed is 16,800  baud.   (They are working,   I
believe on 19,200 baud.)

Finally, for the technically minded, it can even be supplied with X- and
Y-axis outputs for a scope, so that you can see "eye" or "constellation"
diagrams.

There  are three telephone receptacles for telco line connexions:    One
for  a local phone;  one for 2/4-wire leased-line,  and one  for  2-wire
dial-up  line.  (The dial-up line even supports telco 1A-key  system  A-
leads for lamp status control.)

Lots  of features have been left out of this little blurb to try to keep
it as short as I can.

Upgrades?  Well, they are via a couple of 27C010-15 (1Mb) ROMs,  and the
binaries are usually posted on their BBS,  or available via FTP or mail-
server from various sources (including here).  So, if you have access to
a ROM-burner, you can do the upgrades yourself.

Just  had  to let you know about this great little modem,  in  case  you
hadn't already heard.

Anyhow, having said all of that,  you can get most info (including TIFF-
image files at 300dpi)  from my mail-server.   To save space,  the files
have been compressed with ZOO,  which is available for most O/S from DOS
to UNIX.   (ZOO version 2.10 for DOS and for UNIX is available via mail-
server request from this site.)

To get started with the mail-server, send e-mail to:

        mail-server@questor.wimsey.bc.ca

and  in the body of the text,  enter the following at the  left  margin,
with nothing else in the body:

HELP
INFO
INFO INDEX
INFO FILINDX

Warm regards to all.

--
       Steve Pershing, System Administrator, The QUESTOR Project
  Offering FREE access to Sci, Med, & AIDS news, and more.  [also UUCP]
       on a ZyXEL-1496S v.42bis, v.32bis, v.33, up to 16,800bps.
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