Robotics Sportster Flash x2 Guía de usuario descargar pdf (Pagina 39)

User’s Guide & Reference 35

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 Sportster, 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.

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

parity

A simple error-detection method that checks the validity of a

transmitted character. Character checking has been surpassed by

more reliable and efficient forms of error checking, including V.42

and MNP 2-4 protocols. Either the same type of parity must be

used by two communicating computers, or both may omit parity.

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.

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Robotics Sportster Flash x2 Guía de usuario Pagina 39