Marco Santerre <[log in to unmask]> wrote:

>I have a 927LX, running MPE/iX 5.0.  I have an X.25 card in a DTC72,
>and I also have the infamous HP OpenView DTC Manager.  Now from what I
>could gather up from MBFoster, ODBCLink needs a DC1 character (XON) to be
>able to transmit between the HP and the client.  We tried running through a
>Telnet card, and through a modem connection, and with both connections,
>it works fine, we get the DC1 character.  When we run through X.25, we do
>not get the DC1 character.  I strongly suspect the PAD to be suppressing
>this character but have not been able to prove that my HP sends the DC1
>character yet.

I used to work for a company near Montreal.  We had our sales offices in
Halifax, Montreal and Toronto connected to our HP3000 using X.25 PADs
(Gandalf 9103 if I remember correctly).  It has been awhile so the details
are a bit fuzzy.

A DC1 is also known as XON.  The XON/XOFF flow control is also equivalent to
DC1/DC3 and CTL-S/CTL-Q.  It is not uncommon for communication devices to
interpret these flow control characters locally and not transmit them to the
remote device.  Certain PADs have an option to do "pass-thru" i.e. interpret
locally AND send to the other end.

On the 3000 side, do you have another set of PADs that ultimately connects
to ports or do you have the X.25 option on your DTC (I think there was one)?
For the latter, I believe you had to configure the ports as TermType 24 (?).
I am not sure if this termtype actually sends DC1.

Not letting the DC1/DC3 characters flow end-to-end is intended to reduce the
number of packets (since you are paying for the number of packets/bytes). It
would be likely that the DC1 would travel by itself in a packet.

On the other hand, I might be totally off the tracks. ;-)

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  Francois Desrochers          | [log in to unmask]
  Robelle Consulting Ltd       | Toll-free: 1-888-ROBELLE (762-3553)
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