Newsgroups: comp.sys.amiga.datacomm
Path: utzoo!utgpu!news-server.csri.toronto.edu!torsqnt!lethe!comspec!darrell
From: darrell@comspec.uucp (Darrell Grainger)
Subject: Re: 9600 baud modem standards.  Please assist.
Organization: Comspec Communications Inc  Toronto Ontario
Date: Wed, 5 Jun 91 16:04:01 GMT
Message-ID: <1991Jun5.160401.4969@comspec.uucp>
References: <1991Jun4.232906.9797@ucselx.sdsu.edu>
Sender: darrell@comspec (Darrell Grainger)

In article <1991Jun4.232906.9797@ucselx.sdsu.edu> maxc1553@ucselx.sdsu.edu (InnerTangent - human1) writes:

 [stuff deleted]

>I read in magazines about the US Robotic HST 9600 modems.  Just the name, so I 
>have no idea what this HST does.  

 HST modems basically have a method of communicating which only other HST 
modems understand. Almost like talking a different language.

>I also heard about a much cheaper 9600 baud modem with a different standard 
>then US Robotic's HST.  Again, could you help me understand this one.

 The HST modems were the most common. I think this is due to the fact they
where one of the first 9600 baud modems for under $1000. They are setup to
send in one direction at 9600 (or 14400 for the current model) and 300 (or
450 for the current model). This helped to cheapen the cost of the modem
but for things like downloading protocols you don't need 9600 baud in
both directions.

 The 'standard' 2400 baud modems are often marked with CCITT v.22 or v.22bis
which is a recognized standard. The 9600 baud standard is v.32 (14400 baud
is v.32bis). In addition to how the modems transmit over the phone like there
is also standards for compressing informtion before transmission. The HSTs
started with MNP4 then went to MNP5 and finally v.42bis (there is also a
v.42). The v.42bis is the CCITT standard. Standards might not be the best
but they tend to be less costly and better/longer supported.
 
 The HST Dual is a modem which has HST and v.32bis/v.42bis technology. This
is the best choice but you pay much more. I'd recommend looking at which
boards are supporting HST, which are supporting v.32 (v.32bis). Anyone
supporting v.32 should be counted as v.32 as that will probably be more 
popular in the future. Unless there is a board which is only HST and is a
must call BBS, I'd recommend the v.32 modems.


>Finally, I would like your personal biased opinion.  
>                                                                    [unify]
>   *************************************************************************
>   *     All those moments will be lost in time, like tears in the rain.   +
>   *-----------------------------------------------------------------------+


-- 
Darrell Grainger % Comspec Communications Inc., Toronto, Ontario, Canada
darrell@comspec  % Disclaimer: All opinions expressed are my own. 
(416) 617-1475   % (416) 633-5605	(416)785-3553

