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Switch
A switch is a network device that examines and forwards packets between LAN
segments.
Synchronous
Synchronous communications occur when the transmission of data between two
devices is synchronized with a clocking scheme or other technique. The sender and
receiver need to synchronize with one another before data is sent. In synchronous
communication, the bit stream and the clock pulse are synchronized by a special bit
transition pattern in the digital signal, creating an exactly timed stream of bits from the
sending device to the receiving device. An example of such a mechanism is bipolar
encoding. Synchronous communication is either character or bit oriented. Character
oriented synchronous transmissions are used to send blocks of characters, such as those
found in ASCII (American Standard Code for Information Interchange) files.
Bit-oriented synchronous communication is used primarily for the transmission of
binary data. See also Asynchronous Remote Copy and Hitachi TrueCopy
™
.
TCO
Total cost of ownership or TCO is a computer industry financial method of identifying
the cost of operating computer equipment. TCO includes depreciated capital costs,
manpower expense, power costs, communication costs, overhead, etc.
TCP
Transmission Control Protocol or TCP is a transport layer component of the Internet’s
TCP/IP protocol suite. It sits above IP in the protocol stack and provides reliable data
delivery services over connection-oriented links. TCP uses IP to deliver information
across a network and makes up for the deficiency of IP, providing a guarantee of
reliable delivery services that IP does not. TCP messages and data are encapsulated into
IP datagrams and IP delivers them across the network.
VERITAS
®
A Mountain View, California software company that develops and supports volume
and file management software products for a variety of UNIX
®
and Microsoft
®
Windows
®
platforms.
Virtual Logical Volume Image Manager
Virtual Logical Volume Image (VLVI) Manager is a software utility in the Hitachi
Resource Manager
™
package that allows for RAID configurations, and create, delete,
verify, rebuild, tune, and abort operations. See also RAID and Hitachi Resource
Manager.
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