Expand Configuration and Management Manual (G06.24+)

Glossary
Expand Configuration and Management Manual—523347-008
Glossary-3
communications line interface processor (CLIP)
communications line interface processor (CLIP). The major programmable device within
the ServerNet wide area network (SWAN) concentrator, providing the link-level
protocol and a software interface to the host. The CLIP stores and implements specific
communications protocols.
concentrator manager process (ConMgr). A process provided as part of the wide area
network (WAN) subsystem. The ConMgr process runs in each processor that supports
WAN products and provides management functions to the WAN subsystem and WAN
products, such as downloading data link control (DLC) tasks to the communications
line interface processors (CLIPs) on the ServerNet wide area network (SWAN)
concentrator and selecting the preferred path for the DLC tasks.
congestion control. A feature that allows you to control system resources in order to avoid
network bottleneck and resource contention situations. You can enable or disable
congestion control using the Expand subsystem SCF ALTER PATH command or the
WAN subsystem SCF ALTER DEVICE command.
ConMgr. See concentrator manager process (ConMgr).
control block pool. A portion of the Expand line-handler process data space that contains
control blocks. A control block is allocated for each node in the network.
data link control (DLC) task. Tasks that support the equivalent to Layer 2 of the Open
System Interconnection (OSI) reference model. Wide area network (WAN) DLC tasks
execute in the ServerNet wide area network (SWAN) concentrator communications line
interface processor (CLIP), and each WAN DLC task controls one line interface.
device. A logical or physical entity that can be specifically and uniquely identified and with
which a processor can communicate. On NonStop S-series servers, Expand line-
handler processes and the network control process ($NCP) are treated as devices by
the WAN subsystem.
direct-connect line-handler process. An Expand line-handler process that implements the
High-Level Data Link Control (HDLC) Normal protocol. This type of Expand line-
handler process is provided for use with conventional voice-grade leased and
switched-line facilities, private facilities, and Transmission Group 1 (T1) facilities.
Distributed Systems Management (DSM). An architecture and standard interfaces that
enable you to build new applications and subsystems. DSM provides a number or
products, many of which are standard on the NonStop™ Kernel and others of which
are optional.
DSM. See Distributed Systems Management (DSM).
distance vector (DV) message. An Expand network control process ($NCP) message that
gives the time factor (TF) and hop count (HC) from the system originating the distance
vector (DV) message to the node named in the message.
DV message. See distance vector (DV) message.