NonStop System Glossary

signal delivery
The time when Open System Services (OSS) takes the action appropriate for a specific process
and a specific signal.
signal generation
The time when an event occurs that causes a signal for a process.
signal handler
A function or procedure that is executed when a specific signal is delivered to a specific process.
signal mask
The set of signals that are currently blocked from delivery to a specific process.
signal reference grid
A series of conductors, constructed of pure or composite metals (for example, copper) with good
surface conductivity. A superior signal reference grid is installed on the subfloor of a computer
room and connected to the raised-floor structure to establish constant and equal potential for all
equipment in the computer room that is connected to it.
Signaling System Number 7 (SS7)
The protocol used in public networks to establish connections between switches.
SIM
Systems Insight Manager.
Simple Network Management Protocol (SNMP)
An asynchronous request-response protocol used for network management. SNMP originated as
a means for managing Transmission Control Protocol/Internet Protocol (TCP/IP) and Ethernet
networks. OSM and TSM can include an SNMP-compliant interface for communication between
the system console and NonStop server.
simplex
A temporary state in which a Blade Complex or processor is running on only one Blade Element.
Also called single-modular redundancy (SMR).
single-high stack
A stack that includes a base, a frame, a NonStop S-series system enclosure, and power shelf.
Contrast with double-high stack.
single-LSU configuration
The hardware configuration in which each logical processor has one LSU (and therefore a
connection to two ServerNet fabrics).
single-mode fiber-optic (SMF) plug-in card (PIC)
A plug-in card (PIC) that supports the single-mode fiber-optic (SMF) interface.
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