NonStop System Glossary

Total Information Manager (TIM)
See HP NonStop Technical Library (NTL). See also docs.hp.com.
transformer
Equipment used to step up or step down alternating-current (AC) voltage to meet the specific
requirements of the load. A transformer also provides isolation and noise-attenuation properties.
transient
A short-duration, high-amplitude impulse that is imposed on the normal voltage or current.
translation lookaside buffer (TLB)
A special-purpose cache, part of the RISC processor chip, that is used in quickly translating virtual
addresses to physical addresses. This rapid translation is accomplished by remembering and
reusing the translations of recently referenced pages.
Transmission Control Protocol (TCP)
A connection-oriented protocol that provides for the reliable exchange of data between a sending
and a receiving system. TCP implements functions corresponding to the Open Systems
Interconnection (OSI) reference model Layer 4, the transport layer.
Transmission Control Protocol/Internet Protocol (TCP/IP)
A set of layered communication protocols for connecting workstations and larger systems in both
local area networks (LANs) and wide area networks (WANs). See also HP NonStop TCP/IP and
Parallel Library TCP/IP.
tri-star topology
A network topology that uses up to three 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. Introduced with the G06.14 RVU, the tri-star topology supports up to 24 nodes. See also
split-star topology, star topology, and layered topology.
triple-modular redundancy (TMR)
See triplex.
triplex
Having three active processor elements per logical processor. Also called triple-modular redundancy
(TMR).
Trivial File Transfer Protocol (TFTP)
A protocol defined by Request for Comments (RFC) 1350. TFTP is used as a data link control (DLC)
and diagnostic task.
TRSA
See Token-Ring ServerNet adapter (TRSA).
TSM
See Compaq TSM.
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