X25AM Configuration and Management Manual

Glossary
X25AM Configuration and Management Manual—523424-004
Glossary-10
switched virtual circuit (SVC)
switched virtual circuit (SVC). Association between two entities for packet exchange. Set
up by a call, it is terminated after each call. A call requires setup before data transfer
and clearing after data transfer.
SVC. See switched virtual circuit (SVC).
system disk. Disk that contains the operating system image.
TSM. A software product that provides the information needed to perform functions such as
querying resources and testing, provides notification of problems on the system, and
allows local or remote access to the system for service and maintenance. TSM
performs the same role as the HP Tandem Maintenance and Diagnostic System
(TMDS), RDF, Syshealth, and the Remote Maintenance Interface (RMI) on other
NonStop systems. TSM is not supported on Integrity NonStop NS-series servers. See
also OSM.
timeout. Time interval during which a specified action must occur.
transit delay selection or indication. Optional network facility for requesting the maximum
acceptable delay in the network in the call request packet. The network responds in a
call connected packet with the value or a lower acceptable value.
throughput. Amount of data traffic going through the network within a given time period.
Expressed in bits per second (bps).
UA. Unnumbered acknowledgment. Link-level frame used to respond to a SABM, DISC, or
RSET command.
user data. Data field contained in data packets. See also call user data (CUD).
V.25 bis. Standard related to synchronous and asynchronous automatic-dialing procedures
for switched networks. V.25 bis allows a DTE to connect to one of many DCEs in a
General Services Telephone Network (GSTN).
virtual circuit. Facilities provided by a packet-switching network that give the appearance
to the user of an actual connection.
WAN concentrator. See ServerNet wide area network (SWAN) concentrator.
WAN subsystem. See wide area network (WAN) subsystem.
WAN subsystem manager process. A process named $ZZWAN provided as part of the
wide area network (WAN) subsystem that starts and manages the WAN subsystem
objects, the WAN product process, and device objects. Subsystem Control Facility
(SCF) commands are directed to the WAN manager process for configuring and
managing the WAN subsystem and the ServerNet wide area network (SWAN)
concentrator.