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Glossary
OSI/FTAM Responder Manual—425199-001
Glossary-27
protocol (IP) of the Network Layer. TSP processes are provided by the underlying
OSI/TS subsystem. See also NSP process and TAPS process.
UA (unstructured all data units). An access context for which data is transferred as
file-contents data elements; that is, only the data contents of the file are transferred.
See access context; contrast with FA.
unconfirmed service. A subsystem service in which the initiating application sends a
request to a responding application without a response being returned to the initiating
application. Contrast with confirmed service.
unconstrained class. An ISO FTAM service class consisting of the kernel functional
unit and (optionally) any other functional unit.
universal-class number. (1) The ASN.1-specified tag for the character-string type used
on a data transfer. (2) A parameter of contents-type that specifies a code for this tag.
See also relaxation and contents-type parameter.
unstructured file. The structure of FTAM-1 and FTAM-3 files, in which the complete
file is treated as one FADU.
user abort. An association abort initiated by the application. An abort leaves the
status of any interrupted operations undefined. FTAM provides the F-U-ABORT
service to allow applications to request a user abort. Contrast with provider abort.
VFS (virtual filestore). A virtual interface for FTAM requests to a file storage system.
The Compaq FTAM responder implements a VFS that translates requests into Guardian
file-system operations. Files accessible via the Guardian file system can also be
accessed via the VFS component of the Compaq FTAM responder. This includes all
files on the Expand network to which the responder process’ system belongs. The
Compaq FTAM responder uses the VFS to access the Guardian file system in servicing
requests from a remote FTAM initiator.
VFS profile. A Compaq FTAM profile used as a template to configure multiple
responder processes. See also FTC profile.
VideotexString. The character-string type of strings conforming to CCITT
Recommendation T.100. These strings contain format effectors.
ViewPoint operations console application. An extensible interactive application for
operators of Compaq NonStop systems. The ViewPoint application allows a system or
network to be controlled from a single terminal. It includes several block-mode display
screens for event messages, a block-mode display for system or network status, a
conversational TACL screen, and a facility called Define Process to maintain sessions
with multiple subsystems at the same time.
virtual filestore. See VFS.
VisibleString. The character-string type of strings containing any of the 94 graphic
characters and the space character, as defined in ISO 646. These strings do not contain
format effectors. Also called ISO646String.
wait mode. In Guardian file-system operations and some APS operations, the mode in
which the called procedure waits for the completion of an I/O operation and then returns
a condition code to the caller. Contrast with nowait mode.