DigiWARE Release Notes 93000159H
Digi RealPort
SCO OpenServer Release 5.x
SCO UNIX System V, Release 3.2v4
SCO UnixWare Release 2.x & 7.x
Software Package P/N 75000159H
Diskette P/N 40001044H V2.3.0 (3.5") (SCO OpenServer)
Diskette P/N 40001130E V2.3.0 (3.5") (UnixWare)
08/15/98

	1. Changes
  
Improved performance for running RealPort over a slow speed WAN line such 
as a 56K DDS, frame relay, ISDN and others. See the section below "Using
RealPort over a Slow Speed WAN Link".
   
The ncxadaemon has been rewritten to handle network disconnects and
network interruptions better.

Support for Digi's multiple window program 'dscreen' (under SCO 3.2.4 and 
OSR5) has been removed and is no longer supported.

The PortServer firmware has been removed from this package and tftpboot 
is  no longer enabled thru the installation scripts. Please refer to the 
Software Manual for instructions on how to obtain the latest firmware 
to update the PortServer.

For Unixware & SVR4, a utility called ncxaconfig has been added for
reconfiguring the PortServer server. Please refer to the Software Manual 
for more information.

	2. Bug Fixes
   
Fixed a problem with the modem control devices that prevented 'cu' to
work.

A race condition that occured between the daemon and the driver sometimes 
would make getty or ttymon fail and hang the port.

	3. Known Limitations

If the network connection is lost between the Realport driver and the 
PortServer, it may take several minutes before communications can be 
re-established with the PortServer.

	4. Using RealPort over a Slow Speed WAN Link
   
When using RealPort over a Slow Speed WAN Link such as a 56K DDS, Frame 
Relay or ISDN, it is possible for the driver to saturate the Slow Speed 
WAN  Link very quickly when transmitting a lot of data to the PortServer. 
(This is most commonly seen when sending multiple printer jobs to
different printers configured on the PortServer) This can result in the 
end user logged onto terminals configured on the PortServer to see very 
long keyboard echo times.

To prevent the driver from saturating the network, an option has been added 
to the ncxd daemon program which will inform the driver that the PortServer 
is connected to RealPort over a Slow Speed WAN Link. An example follows:

     /etc/ncxd -d /dev/cts0 -n <PORTSERVER NAME> -l 56000
   
The arguments for ncxd are:
     -d  device name of PortServer
     -n  PortServer name or IP address of the PortServer
     -l  line speed in bit per second of WAN Link
   
The daemon is started from the default rc startup scripts.
   
For UNIX System V/386, SCO Open Server :
     /etc/rc2.d/S86ncxa
   
For SVR4, SCO Unixware, MP-RAS
     /etc/ncxa/ncxadaemon

Digi International
DigiWARE Release Notes 93000159H