Glossary 230
Download To transfer data from a processin
unit to an attached device.
For example, from a host to the terminal.
DSR Data Set Ready. A hardware si
nal sent by a communications
device to indicate readiness to send and receive data. This
si
nal is used in serial connections.
DTE Data Terminal Equipment. A device that acts as the source and/
or destination of data and which controls the communication
channel. DTE includes terminals, computers, protocol
converters, and multiplexors. DTE is usually connected via an
RS-232 serial line to Data Communication Equipment (DCE).
DTR Data Terminal Ready. A hardware si
nal sent by a terminal to
indicate readiness to send and receive data. This si
nal is used
in serial connections.
Ethernet A baseband local area network specification developed jointly
by Di
ital Equipment Corp., Xerox, and Intel to interconnect
computer equipment usin
coaxial cable and transceivers. An
Ethernet LAN provides millions of bits per second of capacity for
hi
h-speed terminal-to-computer communication or
computer-to-computer file transfer.
FCC Federal Communications Commission. The Government body
that re
ulates all telecommunications ori
inatin
in the U.S.,
includin
transmission over telephone lines.
Firmware A computer pro
ram or software stored permanently in a PROM
or ROM or semi-permanently in an EPROM.
Flow control The procedure for re
ulatin
the flow of data between two
devices, flow control prevents the loss of data when one
device’s receivin
buffer has reached its capacity.
FTP File Transfer Protocol. FTP is a pro
ram for transferrin
files in
TCP/IP environments such as the intranet in which a user,
actin
as a client, downloads files from a remote server. FTP is
a core component in TCP/IP system administration and is
implemented at the Applications layer with respect to the OSI
protocol model. Its operation is based on the Telnet pro
ram
and TCP.
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