NonStop S-Series Planning and Configuration Guide (G06.25+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-015
Glossary-110
tetrahedron
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
.
text string. A variable-length sequence of ASCII characters, defined in the CONFTEXT file,
that an identifier
represents. When Distributed Systems Management/Software
Configuration Manager (DSM/SCM) encounters an identifier, it substitutes the
associated text string for the identifier.
TF. See time factor (TF).
TFDS. See HP Tandem Failure Data System (TFDS).
TFTP. See Trivial File Transfer Protocol (TFTP).
THD. See total harmonic distortion (THD).
three point fall of potential measurement method. The measurement of a grounding
electrode (such as a ground rod) where ground resistance is measured with respect to
two other points. The ratio of the measurements determines the resistance of the
grounding electrode.
TIM. See HP NonStop™ Technical Library (NTL).
time factor (TF). A number assigned to a line, path, or route to indicate its efficiency in
transporting data. The lower the time factor, the more efficient the line, path, or route.
See also surge
.
TLB. See translation lookaside buffer (TLB).
TMF. See HP NonStop™ Transaction Management Facility (TMF).
TNS. HP computers that support the HP NonStop™ Kernel operating system and that are
based on complex instruction-set computing (CISC) technology. TNS processors
implement the TNS instruction set. Contrast with TNS/R
.
TNS code segment index. A value in the range 0 through 31 that indexes a code segment
within the current user code, user library, system code, or system library space. This
value can be encoded in five bits.
TNS code space. One of four addressable collections of TNS object code in a TNS
process. They are User Code (UC), User Library (UL), System Code (SC), and System
Library (SL). UC and UL exist on a per-process basis. SC and SL exist on a per-node
basis.
TNS instructions. Stack-oriented, 16-bit machine instructions defined as part of the TNS
environment. On TNS systems, TNS instructions are implemented by microcode. On