NonStop System Glossary
Internet protocol (IP)
A data communications protocol that handles the routing of data through a network, which typically
consists of many different subnetworks. IP is connectionless. It routes data from a source address
to a destination address. See also IP address.
interoperability
1. Within an Expand node, the ability to use the features or facilities of one environment from
another. For example, the gtacl command in the Open System Services (OSS) environment allows
an interactive user to start and use a Guardian tool in the Guardian environment.
2. Among systems from multiple vendors or with multiple versions of operating systems from the
same vendor, the ability to exchange status, files, and other information. Product externals and
end-user publications for NonStop servers often use the term connectivity in this context. See also
connectivity.
interpreted mode
See TNS interpreted mode.
interprocessor communications (IPC)
The exchange of messages between processors.
interrupt ID (IID)
The identification of an external interrupt.
intrinsic library
See Shared Millicode Library.
I/O adapter module (IOAM)
A collection of modular components that provides I/O connectivity and can include ServerNet
switch boards, Fibre Channel ServerNet adapters (FCSAs), Gigabit Ethernet 4-port ServerNet
adapters (G4SAs), fans, and power supplies. In the IOAM, each module is a logical entity that
represents a single service domain.
I/O adapter module (IOAM) enclosure
The sheet-metal carrier that is installed in a 19-inch rack and contains the IOAM components.
I/O baseboard assembly
A set of components located at the back of a NonStop Blade Element that includes the I/O interface
board and slots for ServerNet optics adapters.
I/O cabinet
See I/O enclosure.
I/O controller
The hardware logic that controls computer I/O operations for a particular set of devices, such as
disks, tapes, terminals, or communications lines. See also ServerNet addressable controller (SAC).
I/O enclosure
A NonStop S-series system enclosure containing one module, which includes ServerNet adapters,
disk drives, components related to the ServerNet fabrics, and components related to electrical
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