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MT5634HD8/16 User Guide
E
EBCDIC (Extended Binary Coded Decimal Interchange
Code - pronounced "eb suh dick"): An IBM character code
used in its mainframe and midrange computers. It is an 8-bit
code (256 combinations) that stores one alphanumeric
character or two decimal digits within a byte. EBCDIC and
ASCII codes are the most common codes used to represent
data.
Echo: The reflection or duplication of a signal back toward
its source. Echoing is useful when a terminal is transmitting
data, in that the data can be echoed to the screen so the user
can monitor what is being sent. Echoing is undesirable when
it refers to the signal which results on a telephone line from
impedance mismatches.
Echo cancellation: a high speed modem technique that
isolates and filters out unwanted signals caused by echoes
from the main transmitted signal. This allows full-duplex
modems to send and receive on the same frequency carrier.
EIA (Electronics Industries Association); A membership
organization founded in 1924 that includes manufactures of
electronic parts and systems. With over 1200 members, it
sponsors shows and seminars, and gives awards for
outstanding contributions in electronics. It sets electronic
interface standards, such as RS-23.
EISA (Enhanced Industry Standard Architecture -
pronounced "eesa"): The purpose of the EISA bus was to
provide a 32-bit bus for faster throughputs while
maintaining backward compatibility with the classic ISA bus
architecture.
Emulation: The process of one type of device imitating
another via a hardware or software package. Terminal
emulation, for example, allows a PC to access a mainframe
computer by generating and accepting data like a "dumb"
terminal.
Environment: A computer configuration that includes the
CPU model and system software (operating system, data
communications and database systems). It may also include
the programming language used. It sets the standards for the
applications that run in it.
EPROM (Erasable Programmable Read Only Memory -
pronounced "eeprom"): A reusable PROM chip that holds
its contents until erased under ultraviolet light.
Error correction: The process of detecting distorted data
bits and requesting a retransmission or interpretation to
correct the error. Errors are introduced by bad line
conditions or external interface.
F
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Fax (facsimile): Refers to the bit-mapped rendition of a
graphics-oriented document (fax) or to the electronic
transmission of the image over telephone lines (faxing). Fax
transmission differs from data transmission in that the
former is a bit-mapped approximation of a graphical
document and, therefore, cannot be accurately interpreted
according to any character code.
Fax card: An expansion card that, with the appropriate
software, allows a PC to operate as a fax transmitter/receiver.
PC fax cards may be able to send and receive faxes from a file
on the PC> If an external scanner is available, the PC can
also transmit the scanned image via the fax card.
Fax/Data-Modem: A multifunctional device capable of
transmitting either data or faxes. It is available as an external
unit or expansion board. It includes a fax switch that routes
the call to the fax or the data modem.
Fax server: A network resource that allows workstation PCs
to transmit faxes as though the PC had an internal fax card
or a fax modem attached.
Firmware: A category of memory chips that hold their
content without electrical power. They include ROM, PROM,
EPROM, and EEPROM technologies. Firmware becomes
"hard software" when holding program code.
Flash Memory: A memory chip that holds its content
without power, but must be erased in bulk. The term comes
from its ability to be erased "in a flash". Flash memory is
derived form EEPROM, but are less expensive and provide
higher bit densities.
Floppy Disk: Also called a diskette. It is a round disk with a
hole in the middle, made of flexible material and houses in a
square envelope or cartridge. A disk drive holds the floppy
disk through the hole in its center and spins it within its
envelope. They can be used over and over again. Contrast
with hard disk.
Flow control: The process of regulating the speed at which
data enters or leaves a serial port. Software flow control is
implemented by communications software or by the user
sending predefined characters or packets which are
recognized as "pause" and "resume" indicators. Hardware
flow control is achieved by using the RTS (request to send)
and the CTS (clear to send) control lines of the RS-232
interface.
Footprint: The desk or floor space that a piece of hardware
occupies. Also referred to as "real estate".
Foreground: The application program currently running
on, and in control of, the PC screen and keyboard. The area
of the screen that occupies the active window. Compare with
background.
Format:
CommPlete Communications Server
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