3Com Courier Reference page 199

Nonvolatile Random
Access Memory
(NVRAM)
NVRAM
online fallbac
originate mode
parallel transmission
parity
Point-to-Point
Protocol (PPP)
protocol
provisioning
User-programmable random access memory whose data is retained
when modem power is turned off. Used in Courier V.Everything
modems to store a user-defined default configuration loaded into
random access memory (RAM) at power on
See Non-volatile Random Access Memory.
A feature that allows high speed error-control modems to monitor line
quality and fall back to the next lower speed if line quality degrades.
The modems fall forward as line quality improves.
A state in which the modem transmits at the predefined low frequency
of the communications channel and receives at the high frequency. The
transmit/receive frequencies are the reverse of the called modem which
is in Answer mode.
The transfer of data characters using parallel electrical paths for each
bit of the character, for example, 8 paths for 8-bit characters. Data is
stored in computers in parallel form, but may be converted to serial
form for certain operations. See Serial Transmission
An error-detection method that checks the validity of a transmitted
character. Character checking has been surpassed by more reliable and
efficient forms of block-checking, including Xmodem-type protocols
and the ARQ protocol implemented in Courier V.Everything modems.
The same type of parity must be used by two communicating
computers, or both may omit parity. When parity is used, a parity bit is
added to each transmitted character. The bit's value is 0 or 1, to make
the total number of 1's in the character even or odd, depending on
which type of parity is used.
A protocol used to send data over serial lines. PPP provides error
checking, link control, and authentication, and can be used to carry IP,
IPX, and other protocols. PPP is superseding SLIP as the leading dial-in
protocol.
A system of rules and procedures governing communications betwee
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.
Another way of saying "setting up telephone lines."
G 9
LOSSARY