Expand Configuration and Management Manual (G06.24+)

Glossary
Expand Configuration and Management Manual—523347-008
Glossary-5
Expand line-handler process
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 line-handler process pair. The Expand line-handler processes at the source and
destination node on a multi-CPU path. Expand line-handler processes at each source
and destination node on a multi-CPU path are paired in order to guarantee message
order; all messages between that source and destination node are sent through this
Expand line-handler process pair. $NCP periodically runs a rebalancing algorithm that
reconsiders the pairings of Expand line-handler processes on each multi-CPU path.
See also multipacket frame and rebalancing algorithm.
Expand manager process. A process, named $ZEXP, that provides the interface between
the Expand subsystem and the Distributed System Management (DSM) Subsystem
Control Point (SCP).
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 multipacket frame.
Expand neighbors. Two adjacent Expand nodes that have a path between them.
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
and outgoing Expand messages and packets going outside a FOX ring and handles
security-related messages within the ring.
Expand-over-IP line-handler process. An Expand line-handler process that uses the
NonStop TCP/IP subsystem to provide connectivity to an Internet Protocol (IP)
network.
Expand-over-NAM line-handler process. An Expand line-handler process that uses the
NETNAM protocol to access the network access method (NAM) interface provided by
an X25AM line-handler process or a SNAX/APN line-handler process.