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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.
102
G
LOSSARY
remote echo
The sending system displays data sent to the
remote system. 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 the character is transmitted during
asynchronous transmission.
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Troubleshooting
