HP NonStop G-Series User Manual
Page 295
tetrahedron
A solid bounded by four triangular faces. In ServerNet context, a tetrahedron is four processors
interconnected by ServerNet links so as to form a conceptual tetrahedron. Each processor
therefore has a direct connection to the other three processors. See
tetrahedral topology
.
Token-Ring
ServerNet adapter
(TRSA)
A ServerNet adapter that provides a single line from a NonStop S-series server to a token-ring
network, allowing the server to act as a station on the ring. The 3862 TRSA can be configured
to support network speeds of 4 megabits/second (Mbps) or 16 Mbps, and the media can be
either shielded twisted pair (STP) or unshielded twisted pair (UTP).
topology
The physical layout of components that define a local area network (
LAN
). a system area
network (
SAN
), or a wide are network (
WAN
).
See also
layered topology
and
star topology
.
topology branch
A processor
enclosure
and the I/O enclosures directly connected to it.
track ID
A unique number assigned to
customer-replaceable unit (CRU)
and
field-replaceable units
(FRUs)
. The track ID is located on a label on the outside of the component, usually following
the assembly number of the component.
Transmission
Control Protocol
(TCP)
A connection-oriented protocol that provides for the reliable exchange of data between a sending
and a receiving system, no matter how many intermediate
nodes
the data traverses. TCP, in
conjunction with the
internet protocol (IP)
, is used to facilitate OSM communications over an
Ethernet local area network (
LAN
).
tree pane
Located on the left side of the
Management window
, a pane that displays resources in a
hierarchy. The tree pane contains a drop down menu with two options: System view and
ServerNet Cluster view. The System view bears the name of the local system and displays
resources within the system. The ServerNet Cluster view displays resources in a supported
Expand network, such as a ServerNet cluster.
See also
details pane
and
view pane
.
tri-star topology
A network
topology
that uses up to three HP NonStop Cluster Switches for each external fabric.
External routing is implemented between the three star groups of a ServerNet cluster. (A star
group consists of the eight nodes attached to one set of cluster switches.) The star groups are
joined by two-lane links. The tri-star topology supports up to 24 nodes. See also
split-star
topology
,
star topology
, and
layered topology
.
two-lane link
The two single-mode fiber-optic (SMF) ServerNet cables that connect the HP NonStop Cluster
Switches on the same external fabric (for example, X1, X2, and X3) in a
tri-star topology
.
U
unattended site
(dark site)
A location where no operator is working on site and the only access to the
LAN
is from a
centralized monitoring station through a modem connected to a routing
workstation
. Dark site
is a synonym for unattended site.
uncorrectable
memory error
(UCME)
An error caused by incorrect data at a particular memory location. The cause of the incorrect
data is one that is not automatically corrected by the system, and memory replacement might
be required. The occurrence of a UCME indicates that a processor is having memory errors.
The processor halts with a hardware error freeze and generates an
alarm
as well as an
incident
report
.
uninterruptible
power supply
(UPS)
The equipment used to provide an uninterruptible source of power to connected equipment if
a main power outage occurs. The basic components of any UPS system are a rectifier/charger
that converts alternating-current (AC) power to direct-current (DC) power, batteries that store
the DC power, and an inverter that converts the DC power back into AC power for distribution
to the load..
V
value-added
diagnostics
A collection of troubleshooting and support features that are included with a valid service
contract. These features include:
•
The generation of incident reports and EMS event messages related to incident reports
•
The ability to configure the dial-out phone number
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