Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-16
OSM
OSM. OSM stands for HP NonStop Open System Management (OSM) Interface. This
product replaces TSM as the system management tool of choice for NonStop S-series
servers. It provides the same functionality as TSM while overcoming the limitations of
TSM. OSM is required for support of the new functionality released in G06.21 and later
RVUs.
packet assembler/disassembler (PAD). A device that allows asynchronous terminals (or
other entities emulating asynchronous terminals) to use an X.25 network.
packet-switching. A technique in which messages are broken into smaller units, called
packets, which can be individually addressed and routed through the network. The
receiving node ascertains that all packets are received and in the proper sequence
before forwarding the complete message to the addressee.
packet-switched data network (PSDN). An X.25 packet-switching network. A PSDN can
be either a public data network (PDN) or a private PSDN.
page mode. A page-mode terminal or application displays a whole screenful of data as a
unit, allowing the user to make changes at various row and column positions before
pressing a function key to initiate host processing. Most page-mode terminals,
including all HP terminals, use block mode transmission; some do not, relying on the
host to manipulate the terminal screen and handle keystrokes individually.
Parallel Library TCP/IP. An HP product that provides increased performance and
scalability over conventional Transmission Control Protocol/Internet Protocol (TCP/IP).
Parallel Library TCP/IP coexists with conventional TCP/IP on HP NonStop™ S-series
systems and supports Ethernet 4 ServerNet adapters (E4SAs), Fast Ethernet
ServerNet adapters (FESAs), Gigabit Ethernet ServerNet adapters (GESAs), Gigabit
Ethernet 4-port ServerNet adapters (G4SAs), and ServerNet wide area network
(SWAN) concentrators. See also NonStop TCP/IP and NonStop TCP/IPv6.
passthrough. The transparent passage of data through a system on the route between
sending and receiving systems or devices. The Expand subsystem supports pass-
through routing between any two nodes in an Expand network. SNAX/XF supports a
pass-through configuration that allows IBM hosts and 3270 devices to communicate
through a NonStop server.
path. The route that data takes from one location to another within a system or between
systems; normally used when there is more than one possibility. The Expand
subsystem defines a path as the connection between two adjacent nodes; an Expand
path can consist of multiple physical links.
PDN. See public data network (PDN).
PSDN. See packet-switched data network (PSDN).
peer. A device or software entity that communicates as an equal (rather than as a
supervisor, for example) with another device or software entity at the same protocol
level.