Sun Microsystems Fire X4540, Руководство администратора

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136 Sun Fire X4500/ X4540 Servers Administration Guide • October 2008
T
Telnet The virtual terminal program that enables the user of one host to log in to a
remote host. A Telnet user of one host who is logged in to a remote host can
interact as a normal terminal user of the remote host.
threshold Minimum and maximum values within a range that sensors use when
monitoring temperature, voltage, current, and fan speed.
timeout A specified time after which the server should stop trying to finish a service
routine that appears to be hung.
transmission control
block (TCB) Part of the Transmission Control Protocol/Internet Protocol (TCP/IP) that
records and maintains information about the state of a connection.
Transmission Control
Protocol/Internet
Protocol (TCP/IP) An Internet protocol that provides for the reliable delivery of data streams
from one host to another. TCP/IP transfers data between different types of
networked systems, such as systems running Solaris, Microsoft Windows, or
Linux software. TCP guarantees delivery of data and that packets will be
delivered in the same sequence in which they were sent.
trap Event notification made by Simple Network Management Protocol (SNMP)
agents by their own initiative when certain conditions are detected. SNMP
formally defines seven types of traps and permits subtypes to be defined.
Trivial File Transport
Protocol (TFTP) A simple transport protocol that transfers files to diskless systems. TFTP uses
User Datagram Protocol (UDP).
U
uninterruptable power
source (UPS) A component within the power and cooling unit. It supplies power from a
battery in the case of an AC power failure.
Universal Serial Bus
(USB) An external bus standard that supports data transfer rates of 450M bits per
second (USB 2.0). A USB port connects devices, such as mouse pointers,
keyboards, modems, and printers, to the computer system.