Operation Manual

AT-RG213 Residential VoIP Gateway - SIP Software Reference Manual
SIP Software Release 6-0-0
J613-M0524-00
104
ANSI American National Standards Institute. An organisation responsible for
coordinating and approving U.S. standards. Standards approved by ANSI
are often called ANSI standards. ANSI is the U.S. representative to ISO.
archive site A machine that provides access to a collection of files across the
Internet. An “anonymous FTP archive site”, for example, provides access to
this material via the FTP protocol. See anonymous FTP.
ASCII American Standard Code for Information Interchange. A standard
character-to-number encoding widely used in the computer industry.
assigned numbers A set of values (usually numeric) used by TCP/IP
protocols. They are documented in a number of RFCs, the most recent being
RFC 1340. See RFC.
asynchronous Transmission in which each character is sent individually.
The time intervals between transmitted characters may be of unequal length.
Transmission is controlled by start and stop elements before and after each
character. See synchronous.
authorisation The process of determining what types of activities a user is
permitted to undertake. Usually, authorization is in the context of
authentication: once you have authenticated a user, they may be authorized
for different types of access or activity.
B
bandwidth Technically, the difference, in Hertz (Hz), between the highest
and lowest frequencies of a transmission channel. However, as typically
used, the amount of data that can be sent through a given communications
circuit. For example, Ethernet has a bandwidth of 10Mbps.
baud Literally, the number of times per second the signal can change on a
transmission line. It is normally equal to the number of bits per second that
can be transferred. The underlying transmission system may use some of the
bandwidth. For asynchronous lines, the number of characters per second
that can be transmitted is estimated by dividing the baud rate by ten.
boot A term used in computing to refer to the process of starting a
computer, loading the operating system or executive program from disk or
ROM.
bps bits per second. A measure of the rate of data transmission.
broadcast A packet delivery system that delivers a copy of a given packet
to all hosts attached to the network. For example, Ethernet. See directed
broadcast, multicast, unicast.
buffer A block of memory used to store data temporarily.