COURIER HIGH SPEED MODEMS
Glossary J-11
Protocol
A system of rules and procedures governing communications
between two or more devices. Protocols vary, but communi-
cating 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 opera-
tions 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 Access
A feature that allows a remotely-located user to view the
Courier's configuration screens and change the Courier's
configuration. Password protection is available.
Remote Digital Loopback
A test that checks the phone link and a remote modem's trans-
mitter and receiver. Data entered from the keyboard is trans-
mitted from the initiating modem, received by the remote
modem's receiver, looped through its transmitter, and returned
to the local screen for verification.
Remote Echo
A copy of the data received by the remote system, returned to
the sending system and displayed on the screen. Remote echo-
ing is a function of the remote system.
ROM
Read Only Memory. Permanent memory, not user-pro-
grammable. The Courier's factory settings are stored in ROM
and can be read (loaded) into RAM as an operational configura-
tion if DIP switch S10 is ON at power on.
Serial Transmission
The transfer of data characters one bit at a time, sequentially,
using a single electrical path. See Parallel Transmission.
