Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

304 Glossary
Glossary
LAN using AFCP, allowing
connections from terminals on
ARPA systems to HP 3000s.
ASCII American National
Standard Code for Information
Interchange. A character set
using 7-bit code used for
information interchange among
data processing and data
communications systems. The
American implementation of
International Alphabet No. 5.
asynchronous A device’s mode
of operation in which a sequence
of operations are executed
irrespective of time coincidence
with any event. Devices that are
directly accessible by people (for
example, terminal keyboards)
operate in this manner.
asynchronous processor
board The new 24-port mux
board for the DTC 72MX. Allows
up to 24 direct and modem
connections per board. A DTC
72MX can have up to 3
asynchronous processor boards
(for a total of 72 connections).
Attachment Unit Interface
AUI. The cable that runs between
each node (host, DTC, or other
device) and the Medium
Attachment Unit (MAU) that
connects it to the LAN in a
ThickLAN configuration.
autodial A dial link in which the
remote node’s telephone number
is automatically dialed by a
modem or other device with this
capability.
B
backbone LAN A thick LAN
cable conforming to the IEEE
802.3 Type 10 BASE 5 Standard.
back-to-back configuration A
DTC configuration whereby MPE
users connected to one DTC can
communicate with a non-MPE/iX
system connected to another DTC
via the LAN. See also Local
Switching.
banner A welcome message
displayed on your screen. On the
local OpenView workstation a
banner appears when a remote
connection is established with the
OpenView DTC Manager. A
banner also can appear when you
log on to MPE.
baud The measure of the speed
at which information travels
between devices, most commonly
used in reference to terminal
speed settings. Baud represents
signal events per second. When
one bit represents each signal
change, baud is the same as “bits
per second.”
binary mode A data transfer
scheme in which no special
character processing is
performed. All characters are
considered to be data and are
passed through with no control
actions being taken.
bit Binary digit. A unit of
information that designates one
of two possible states, which are
represented by either 1 or 0.