User Manual

GLOSSARY
117
local echo
A modem feature that enables the modem to
display keyboard commands and transmitted
data on the screen. See command En.
MNP
Microcom Networking Protocol, an error-
control protocol developed by Microcom,
Inc., and now in the public domain. There are
several different MNP protocols, but the most
commonly used one ensures error-free
transmission through error detection (CRC)
and retransmission of flawed frames.
modem
A device that transmits/receives computer data
through a communications channel such as
radio or telephone lines. It also changes signals
received from the phone line back to digital
signals before passing them to the receiving
computer.
nonvolatile memory (NVRAM)
User-programmable random access memory
whose data is retained when power is turned
off. On the U.S. Robotics modem, it includes
four stored phone numbers and the modem
settings.
off/on hook
Modem operations that are the equivalent of
manually lifting a phone receiver (taking it off-
hook) and replacing it (going on-hook).