Re: 28800 modems?

[Neil Palmer <neil@xxxxxxxxxxxxxx>]

gibbsd@ZELANA.COM wrote:
> 
> Greetings!
> 
> Does anyone know the max speed on a ASCII WSC?
> 
> I've got a few USR Sportster 28.8 modems on our ASCII WSC, but I can't
> seem to find a way to configure the MODEM to COMPUTER speed.  The only
> option I seem to be able to find is *CALC for the line speed.
> 
> Ideally, I would like to set it to 57600... but at minimum, I would like
> to set it to 38400.


David - from IBM Question database:



<P>                       Item RTA000095509          Date 03/03/97

Abstract...: What is maximum async connection speed for Client
Access/400

 
Q:
  
What is the maximum speed supported for a Client Access/400
client connecting via Async connection through the 6141 ASCII
workstation controller?
 
The customer has pcmcia 28.8 kbs v.34 modems for their mobile workers.
They believe the ASCII workstation controller supports only 9600 baud
communications.  My understanding is that with V3, we support to 38.4.
 
If they are at V3 with CA/400 should they be able to get their
laptops to connect to the as/400 via 6141 at 19.2 or 38.4?  (I realize
that 28.8 is not supported speed for 6141.)  Should they be able to
do this with CA/400 clients?
 
If they are not at V3, are they limited to 9600 effective
transfer rate?
 
A:
The ASCII Workstation controller supported link speeds of 19.2 at V2R2
and was upgraded to link speeds of 38.4 at V2R3.  At V3 the ASCII
Workstation Controller still supports link speeds up to 38.4.  The
different Clients within Client Access/400 have their own limitations
pertaining to link speeds based on how that particular client utilizes
the the PC resources available.
 
Link speeds can also be affected by phone line quality, modem setup and
hardware (including the quality of the modems being used and the PC
hardware).  Customers should be made aware that the async communications
used with PC Support/400 and Client Access/400 is not the same type of
communications used for communications such as BBS access or other types
of standard PC to PC asynchronous communications.  Since Client Access
is an APPC application it requires SNA communications which is not
supported over normal asynchronous communications.  Client Access/400,
as well as its predecessor - PC Support/400, builds a SDLC type frame
and wraps asynchronous protocols around it.  This process sends much
larger frames than a standard asynchronous communications link, and
requires specialized modem configuration.  IBM is not able to test all
of the OEM modems on the market and due to the fact that every modem
manufacturer interfaces their command sets to their hardware differently
it would be impossible to guarantee any link speed with every modem on
the market.
 
AS/400 Support Line does have an OEM Modem Configuration Assistance
offering for modems that have not been tested and are not supported for
use with Client Access/400 and PC Support/400.  This offering provides
modem configuration assistance on a "Best Effort" basis only, as there
are many modems on the market that simply will not perform in this
environment.
 
S e a r c h - k e y w o r d s:
AS400 ASCII PCSUPPORT CA400 ASYNC MODEM


-- 
...Neil Palmer                                      AS/400~~~~~      
...Technical Specialist             ____________          ___  ~     
...NxTrend Technology - Canada      |OOOOOOOOOO| ________  o|__||=   
...Markham, Ontario, Canada         |__________|_|______|_|______)   
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...e-mail: neil@systemetrix.ca    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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