SNAX/XF and SNAX/APN Configuration and Management Manual

Glossary
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-005
Glossary-6
device control
device control. A SNAX/XF feature that provides programmatic interfaces by which
application processes executing in NonStop systems can control SNA devices residing
throughout an Expand network, without an SNA host system present.
device-initiated passthrough. The process in which a device connected to a NonStop
system always initiates session establishment with a host application; the path
between the gateway LU and the device is established by SNAX/XF dynamically when
the device issues a LOGON or INIT-SELF command.
DEVICE object. The DEVICE object is an SCF-configurable object residing in the WAN
subsystem. It is used to describe the operating characteristics of SNAX service
manager and line handler processes, such as which CPUs they run in.
DIAGNOSING state. As defined by SCF or SPI, the state of a LINE object that is being
diagnosed using the DIAG6204 program or TMDS. This object state can be entered
and exited only by means of a diagnostic process, which a user must run explicitly.
dial-in. A switched-line feature that allows the line to prepare its hardware to receive
incoming calls.
Distributed Systems Management (DSM). A set of software tools used to manage
NonStop systems and Expand networks. DSM provides a uniform interface for
monitoring and controlling all components of a NonStop network. DSM tools include
the Viewpoint console application, the Subsystem Control Facility (SCF) for data
communications subsystems, the Subsystem Programmatic Interface (SPI), the Event
Management Service (EMS), the Distributed Name Service (DNS), and token-oriented
programmatic interfaces to the management processes for various NonStop
subsystems.
DLC. See data link control (DLC).
domain. In SNA, a system services control point (SSCP) and the PUs, LUs, links, and
associated resources that the SSCP has the ability to control by means of activation
requests and deactivation requests.
DSC. See Dynamic System Configuration (DSC)
.
DSM. See Distributed Systems Management (DSM).
DTE. See data terminal equipment (DTE)
.
dynamic passthrough. A passthrough mode in which gateway LUs on a secondary
SNAX/XF line in the NonStop sub-host are dynamically assigned to HP resident SLU
processes and HP-connected SNA devices for establishing LU-LU sessions with host
PLU programs. Dynamic passthrough allows for device-initiated sessions throughout
the Expand network. With dynamic passthrough, no USS messages flow from the host
SSCP to the device. The LOGON requests flow to the SSCP on the NonStop system
and not to the host SSCP.