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In addition, SUNWopcl, which includes the 3270 data stream:
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•
•
Controls the local screen display
Maps keyboard functions
Converts ASCII to EBCDIC, and vice versa
The SUNWopcl is responsible for presenting the 3270 data stream. Therefore,
the controls on the local screen display maps keyboard functions, and converts
ASCII to EBCDIC, and vice versa. It uses the sunpu2.1 SNA server to
establish and control LU Type 1, LU Type 2, and LU Type 3 SNA sessions with
mainframe applications.
The physical connection to the SNA network is provided by the sunpu2.1
SNA server. The sunpu2.1 SNA server location is independent from where
the SUNWopcl client emulation actually occurs. The sunpu2.1 SNA gateway
and the SUNWopcl client can either execute on the same system, or can be
separated and communicate over a TCP/IP network.
In Figure 1-1, the users of workstations on the TCP/IP LAN can access the
mainframe by invoking SUNWopcl in an open window, and then logging on to
the mainframe applications.
SNA WAN
or LAN
DLC
Mainframe
SUNWopcl
TCP/IP LAN
sunpu2.1
Figure 1-1
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SUNWopcl
SUNWopcl and the sunpu2.1 SNA Server
SunLink Client 3270 9.1 Configuration and User’s Guide—August 1997