User`s guide

56K Professional Message Modem 47
parity
A simple error-detection method that checks the validity of a transmitted
character
. Character checking has been surpassed by more reliable
and efficient forms of error checking, including
V.42
and
MNP 2-4
protocols
. Either the same type of
parity
must be used by two
communicating computers, or both may omit parity.
protocol
A system of rules and procedures governing communications between
two or more devices. Protocols vary, but communicating devices must
follow the same protocol in order to exchange data. The format of the
data, readiness to receive or send, error detection and error correction
are some of the operations that may be defined in protocols.
RAM
Random Access Memory is Memory that is available for use when the
modem is turned on, but that clears of all information when the power is
turned off. The modem's RAM holds the current operational settings, a
flow control buffer
, and a command
buffer
.
remote digital loopback
A test that checks the phone link and a remote modem's transmitter and
receiver.
remote echo
A copy of the data received by the remote system, returned to the
sending system, and displayed on the screen. Remote echoing is a
function of the remote system.
ROM
Read Only Memory is permanent memory, which is not user-
programmable.
serial transmission
This transmission is the consecutive flow of data in a single channel.
Compare it to parallel transmissions where data flows simultaneously in
multiple channels.
start/stop bits
These signalling bits are attached to a
character
before and after the
character is transmitted during
asynchronous transmission
.