Browse Prior Art Database

Improved Work Station Controller Performance by Identifying Data Stream Types

IP.com Disclosure Number: IPCOM000101982D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Hovland, KJ: AUTHOR [+2]

Abstract

Work Stations Controllers (WSCs) provide attachment of multiple work stations. Work stations can include dependent displays, programmable work stations (PWS), and printers. Some WSCs perform non-programmable terminal (NPT) data stream optimization for dependent displays; resulting in improved performance. Data stream optimization was not done for PWS when running a NPT application because non-screen type data (for example, file transfer data or graphic data streams) could be hidden in the NPT data stream. There was no method for the WSC to identify when non-screen data was hidden in the data stream. Data stream optimization would, in some cases, destroy non-screen data.

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Improved Work Station Controller Performance by Identifying Data Stream Types

       Work Stations Controllers (WSCs) provide attachment of
multiple work stations.  Work stations can include dependent
displays, programmable work stations (PWS), and printers. Some WSCs
perform non-programmable terminal (NPT) data stream optimization for
dependent displays; resulting in improved performance.  Data stream
optimization was not done for PWS when running a NPT application
because non-screen type data (for example, file transfer data or
graphic data streams) could be hidden in the NPT data stream.  There
was no method for the WSC to identify when non-screen data was hidden
in the data stream.  Data stream optimization would, in some cases,
destroy non-screen data.  This article describes how the NPT data
stream can be enhanced to include a flag to indicate the data stream
is truly screen data, therefore, the WSC can safely perform data
stream optimization independent of work station type.

      The figure illustrates the flow of display panel data between
an application program and a dependent display or PWS when running a
NPT application.  The host display data manager builds a physical
data stream representation of a display panel and passes it to the
WSC for presentation.

      The NPT data stream optimization mentioned above occurs when
the display panel is sent to the WSC.  Data stream optimization can
significantly reduce the number of handshakes betwee...