Re: SLIP Connection and KFLEX modems

[Tim McCarthy <twmac@xxxxxxxxxxxxxx>]

There are certain line speed parameters on async line descriptions that
have not worked in the past. 14.4 is one; you may have found another. With
the newer 2609 UA cards you can get speeds in excess of 19.2 though. We
have many customers operating at 33.6 (some thoughputs are in the 40k+
range) and even up to 115k with ISDN modems. For sync configurations the
line speed doesn't (generally) matter because, by most defaults, the
clocking is done by the modem.
 
At 11:47 AM 7/18/98 -0400, you wrote:
>Tim:
>I agree with you also.  But I think this may only be true for ASYNC line
>descriptions on the AS400 as well as ASCII devices attached to an ASCII WSC.
>I have tried (even though the documentation says on 19.2 is supported) to
>config an ASYNC line to 38.4 for a SLIP connection and the AS400 will not
>talk to the modem , no initialization, no nothing.  On a SYNC line, either
>BSC or SDLC, I think that perhaps the modem speed parameter does not matter.
>Regards,
>Carl
>
>Carl Galgano
>EDI Consulting Services, Inc.
>http://cgalgano.home.mindspring.com
>mailto://cgalgano@ediconsulting.com
>(770) 422-2995
>
>-----Original Message-----
>From: Tim McCarthy <twmac@mindspring.com>
>To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
>Date: Friday, July 17, 1998 5:02 PM
>Subject: RE: SLIP Connection and KFLEX modems
>
>
>|At 12:42 PM 7/17/98 -0600, you wrote:
>|>I believe the only time the linespeed is used is so performance tools
>|>can calculate the line utilization percentage.
>|>Apart from that, as you say it's just a comment.
>|>
>|Not true. The line speed on the line description on V24 ports DOES limit
>|and control the transfer rate. You can test this out by setting your modem
>|speed to follow DTE (most defaults do this) and you'll notice the connect
>|speed change if you adjust the AS400 line speed (again assuming your modem
>|is not set to return a fixed connect rate). This was an important setting
>|prior to RISC where the only flow control settings available for async data
>|transfers was XON/XOFF. In these cases you had to watch for matching
>|DTE/DCE speed settings or risk modem buffer overflow where you'd lose data.
>|
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