ZyXEL Communications Prestige 724, Руководство пользователя

Страница: 83 / 87

Prestige 724 G.SHDSL CSU/DSU
Glossary O
SUA
Single User Account. Your system’s SUA feature allows multiple user Internet access
for the cost of a single ISP account. See also NAT.
TCP Transmission Control Protocol is a connection-oriented transport service that ensures
the reliability of message delivery. It verifies that messages and data were received.
Terminal
A device that allows you to send commands to a computer somewhere else. At a
minimum, this usually means a keyboard, display screen and some simple circuitry.
Terminal
Software
Software that pretends to be (emulates) a physical terminal and allows you to type
commands to a computer somewhere else.
Twisted Pair Two insulated wires, usually copper, twisted together and often bound into a common
sheath to form multi-pair cables. In ISDN, the cables are the basic path between a
subscriber's terminal or telephone and the PBX or the central office.
UDP
User Datagram Protocol. DP is a connectionless transport service that dispenses with
the reliability services provided by TCP. UDP gives applications a direct interface
with the Internet Protocol (IP) and the ability to address a particular application
process running on a host via a port number without setting up a connection session.
UNIX
A widely-used operating system in large networks. Usually used on workstations and
servers.
URL Uniform Resource Locator. URL is an object on the Internet or an intranet that
resides on a host system. Objects include directories and an assortment of file types,
including text files, graphics, video and audio. A URL is the address of an object that
is normally typed in the Address field of a Web browser. A URL is basically a
pointer to the location of an object.
V Series
Recommen-
dations V.xx or V Series Recommendations are the most commonly used international
modem/telephone network standards. The V.xx series recommendations are from the
ITU-TS (Telecommunication Standardization Sector of the International
Telecommunications Union) and will probably replace the old American Telephone
and Telegraph Company/Bell System MNP (Microcom Networking Protocol)
standards. Some modems offer both MNP and ITU-T standards; however, MNP
generally offers much lower transfer rates than the V.xx series. See also, V.35 Data
Port Interface.
V.35 Data Port
Interface V.35 is a standard transfer rate implemented under recommendations by the ITU-TS
(Telecommunication Standardization Sector of the International Telecommunications
Union). V.35 provides the trunk interface between a network access device and a
packet network with data rates greater than 19.2 Kbps. V.35 may use the bandwidths
of several telephone circuits as a group. See also, V Series Recommendations.
VCI
Virtual Channel Identifier. A VCI is a number that denotes a particular logical
connection between end stations (users or networks). A VCI specifies the channel and