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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. 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.
P
III: S
C: G
ART
ECTION
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. Permanent memory, not
user-programmable.
serial transmission
The consecutive flow of data in a single
channel. Compare to parallel transmissions
where data flows simultaneously in multiple
channels.
start/stop bits
The signaling bits attached to a character
before and after the character is transmitted
during asynchronous transmission.
LOSSARY
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Troubleshooting
