OSI/FTAM Programming Reference Manual

Glossary
HP NonStop OSI/FTAM Programming Reference Manual—528611-001
Glossary-6
Data Link Layer.
Data Link Layer. Layer 2 in the OSI Reference Model. This layer packages data for
transmission across the network and ensures that the data arrives at the next layer
without any errors.
data-transfer regime. The regime established after successfully gaining read or write
access to an FTAM file. In the data-transfer regime, you can send or receive data, and
you can abort the association. See also FTAM regime., file-selection regime., and file-
open regime.
DDL (Data Definition Language). A NonStop language for defining data. DDL builds a
dictionary from the definitions, translates the definitions into File Utility Program (FUP)
commands, and generates object-definition source code in a variety of programming
languages.
default user (DEFUSER). An attribute of a NonStop virtual filestore (VFS) profile that allows
access to files in the NonStop responder’s VFS in cases where the initiator identity and
filestore password are not provided when an association is established. The default
user specifies the default Guardian user ID and password to be used.
diagnostic parameter. An optional parameter providing information that qualifies the
success or explains the failure of a requested FTM procedure call. For
applications using the FTAM API, this parameter primarily returns whatever
diagnostic messages have been received from the remote responder or the local
initiator. In addition, you can use this parameter to send diagnostic messages to a
remote responder using the FTM_CANCEL_REQ_, FTM_DATA_END_REQ_, and
FTM_U_ABORT_REQ_ procedures. See also ISO FTAM diagnostic messages.
document type. An FTAM definition, defining the structure of and method of access to a
file. NonStop FTAM supports four document types: FTAM-1, FTAM-2, FTAM-3, and
NBS-9. An FTAM-1 document is an unstructured text file that cannot be broken into
smaller segments by the protocol. An FTAM-2 document is a structured text file divided
into FADUs, which cannot be broken down. An FTAM-3 document is an unstructured
binary file. An NBS-9 document is a read-only directory as defined by the NIST FTAM
Phase 2 agreements.
EMS (Event Management Service). A Distributed Systems Management product that
provides event collection, event logging, and event distribution facilities. EMS provides
different event descriptions for interactive and programmatic interfaces, lets an
operator or an application select specific event-message data, and allows for flexible
distribution of event messages within a system or network. The FTAM and APLMGR
subsystems generate event messages that are displayed as operator messages;
however, the programmatic interface to FTAM and APLMGR event messages is not
available for customer use. See also event message.
EMS collector. A NonStop Kernel process that accumulates event messages sent from OSI
subsystem processes. See event message.
end-of-file marker. See EOF (end of file).