ACU @ 110 & 150 bps w/ BNU (svr3.2)
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ACU @ 110 & 150 bps w/ BNU (svr3.2)         


Author: SDF Poster
Date: May 23, 2008 16:14

I'm using a WE 103 ACU which can answer at 110 and 150 bps with
out problems, however the slowest speed the dialer will work
with the ACU in the 103 is 300bps. Debugging using the BNU shows the
call to open the TTY and setting the speed of the line but then the
Dialer times out. I'm using the PENRIL generic which works fine at
300bps. Is it not possible to originate a call below 300bps? Even using
'cu' to open a connection to the TTY fails when the line is being set to
anything slower than 300. From what I can tell so far this is a software
limitation in the BNU set and not the 103 itself.
2 Comments
Re: ACU @ 110 & 150 bps w/ BNU (svr3.2)         


Author: Reed
Date: May 24, 2008 15:15

SDF Poster wrote:
> I'm using a WE 103 ACU which can answer at 110 and 150 bps with
> out problems, however the slowest speed the dialer will work
> with the ACU in the 103 is 300bps. Debugging using the BNU shows the
> call to open the TTY and setting the speed of the line but then the
> Dialer times out. I'm using the PENRIL generic which works fine at
> 300bps. Is it not possible to originate a call below 300bps? Even using
> 'cu' to open a connection to the TTY fails when the line is being set to
> anything slower than 300. From what I can tell so far this is a software
> limitation in the BNU set and not the 103 itself.
>
>
>

Well, generically, calls can be originated at any speed.

The question is how, and at what speed, is the modem/acu configured to
accept dial strings from a DTE ? Or can it automatically detect (auto-baud)
the speed of dialing commands (Hayes AT, or WE103 specific) ?? Some modems can.

Is the "WE 103 ACU" a "real" Western Electric 103 with built-in Auto Call
Unit, or a clone by some other brand ??
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Re: ACU @ 110 & 150 bps w/ BNU (svr3.2)         


Author: SDF Poster
Date: May 24, 2008 15:53

Reed rmi.net> wrote:
>
>Is the "WE 103 ACU" a "real" Western Electric 103 with built-in Auto Call
>Unit, or a clone by some other brand ??

Its a real 103. The HDB dialer can access it at 300 baud and it can dial
successfully. However, at 110 or 150 the line seems to be setup but the
dialer immediately exits without an obvious error.

I've also confirmed this with a real WE 212A which HDB was able to dial
out on at 300 and 1200. Again, using getty or uuget with a definition at
110 or 150 bps for incoming calls works fine, its just dialing out at
those speeds that fails.

Based on this, I'm guessing that its merely a software issue and that I'll
just need to write my own dialer.
>I can well imagine some design engineer deciding that "no one could
>possibly need to dial at 110 or 150 (or 75 or 134.5 or other vintage TTY
>speeds)".

Its possible that the HDB UUCP never thought anyone would need to dial out
at speeds lower. I could try Version 7 UUCP on an SVR2 machine and see
if I have better luck.
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