Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-6
dual-ported
addressing purposes. (4) In Domain Name Service (DNS), a domain is the set of
nodes where a given name and its attributes are defined.
dual-ported. The capability of a ServerNet adapter or peripheral device to receive data and
commands from two sources although only one source might have access at any
particular moment.
electronic data interchange (EDI). An application of messaging in which the messages
consist of business data in a prescribed format. The International Telecommunications
Union–Telecommunications (ITU–T) X.400 Recommendation and related standards
support exchange of messages among EDI applications; there are also numerous
protocols defined specifically for EDI.
Ethernet. A local area network (LAN) that uses the Carrier Sense Multiple Access with
Collision Detection (CSMA/CD) access method on a bus topology and is the basis for
the IEEE 802.3 standard.
Expand network. The HP NonStop Kernel operating system network that extends the
concept of fault-tolerant operation to networks of geographically distributed systems. If
the network is properly designed, communication paths are constantly available even if
there is a single line failure or component failure.
event. A significant change in some condition in the system or network. Events can be
operational errors, notifications of limits exceeded, requests for action needed, and so
on.
Expand line-handler process. A process pair that handles incoming and outgoing Expand
messages and packets. An Expand line-handler process handles direct links and also
binds to other processes via the network access method (NAM) interface to support
Expand-over-X.25, Expand-over-ServerNet, Expand-over-FOX, and Expand-over-SNA
links. The Expand-over-IP line-handler process communicates with a NonStop TCP/IP
process through the shared memory of the QIO subsystem. The Expand-over-ATM
line-handler process communicates with the Asynchronous Transfer Mode (ATM)
subsystem through the shared memory of the QIO subsystem. See also network
access method (NAM) and NETNAM protocol.
Expand multi-CPU feature. A feature of the Expand subsystem that enables you to spread
the communications load over multiple processors by connecting multiple Expand line-
handler processes, each in a separate processor, between two adjacent nodes. The
Expand multi-CPU feature significantly increases the maximum throughput of an
Expand path, especially for Expand-over-IP connections. See also multi-CPU path.
Expand-over-ATM line-handler process. An Expand line-handler process that uses the
Asynchronous Transfer Mode (ATM) subsystem to provide connectivity to an ATM
network.
Expand-over-FOX line-handler process. An Expand line-handler process that uses the
NETNAM protocol to access the network access method (NAM) interface provided by
the FOX monitor process, $ZZFOX. The Expand-over-FOX process handles incoming