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SNA Distributed Host Command Facility
The HP SNA Distributed Host Command Facility/iX (HP
SNA DHCF/iX) software product provides IBM mainframe
users who use IBM 3270 display stations with interactive
access to an HP 3000 Series 900 system. Together with
the IBM Host Command Facility (HCF Version 2) product
on the IBM mainframe system, SNA DHCF/iX gives IBM
3270 display station users the capability to run many
applications on the HP 3000 system. These applications
include TTY-mode and VPLUS applications.
SNA DHCF/iX provides the data conversion services that
translate output between applications on the HP 3000 and
the IBM 3270 datastream required by IBM display stations.
SNA DHCF/iX enables IBM 3270 display station users to
access the HP 3000 system over their existing SNA, Token
Ring, or X.25 network. SNA DHCF/iX requires the
installation and use of the SNA/SDLC Link/iX (30292B and
A5563A), SNA/Token Ring/iX (J2167B)*, or the SNA/X.25
Link/iX (36939B) product (referred to jointly as SNA
Link). SNA Link products manage the physical link to the
IBM mainframe and implement the datacomm protocols in
the lower three layers of SNA.
* SNA/Token Ring Link/iX (J2167B) requires MPE/iX
release 5.5 Express 5 or later, or MPE/iX release 6.0
Express 1 or later.
Features
• SNA DHCF/iX provides IBM 3270
display stations with HP terminal
capabilities including support for TTY-
mode (simple ASCII) applications and
many VPLUS applications.
• VPLUS has been optimized for
applications used with SNA DHCF/iX;
VPLUS forms can be compiled into
IBM 3270 terminal formats prior to
runtime.
• SNA DHCF/iX provides HP terminal
emulation support for screen sizes of
24, 32, or 43 lines for TTY-mode
applications. VPLUS applications are
supported with screens of up to 24
lines less any lines required for a
window line or softkeys.
• In VPLUS applications, SNA DHCF/iX
supports HP terminal softkeys (as PF
keys) and a “window” line on IBM
3270 display stations using the
bottom three lines of the screen.
• One MPE/iX session is provided for
every SNA DHCF/iX user; each SNA
DHCF/iX session appears as a
Network Services Virtual Terminal
(NS VT) session.
• SNA DHCF/iX supports the HP “Break”
and “Control-Y” keys.
• SNA DHCF/iX can support up to 64
simultaneous sessions per SNA Link
node. Using multiple SNA Link nodes,
SNA DHCF/iX’s session count is
limited only by the number of LDEVs
available on the HP 3000
• Other HP SNA Service products are
supported over the same SNA Link;
each SNA Link can support up to
64 Logical Unit (LU) sessions. The
maximum line speed supported by
SNA Link is 64 KB/s.
• SNA DHCF/iX users can access
HP MM II applications on the
HP 3000.
• SNA DHCF/iX provides a full screen,
ISPF-like editor for use by
HP DeskManager users.
• SNA DHCF/iX contains a
comprehensive and flexible logging
facility that records SNA DHCF/iX
session and error messages.
IBM S/370
Mainframe running
Host Command Facility
Communications
Controller
IBM
3174
SNA Link(s)
HP 3000/iX
SNA
DHCF/iX
Other HP
SNA Services
IBM 3270 Display Stations
SNA DHCF/iX
Logical Session