3Com 3CP5610A - U.S. Robotics 56K V90 PCI Performance Pro Faxmodem..., User Manual

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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).
online fall back/fall forward
A feature that allows high-speed, error-control modems to monitor line
quality and fall back to the next lower speed in a defined range if line
quality diminishes. As line conditions improve, the modems switch up to
the next higher speed.
originate mode
The mode used by your modem when initiating an outgoing call to a
destination modem. The transmit/receive frequencies are the reverse of
the called modem, which is in answer mode.