Proxim 7910 Guide de l'utilisateur télécharger pdf (Page 119)

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F. Glossary

Access Point — An internetworking device that seamlessly

connects wired and wireless networks together.

Assert — To set a flow control pin to the “on” position.

Bandwidth — The size (in Hertz) of the frequency range that a

signal transmission occupies. Typical narrow band signals oc-

cupy a 25 KHz bandwidth. The RangeLAN2 signal occupies a 1

MHz bandwidth.

Channel — In RangeLAN2 networks, the channel refers to the

frequency hopping sequence the card follows.

CSMA/CA — (Carrier Sense Multiple Access/Collision Avoid-

ance) — CSMA is a protocol in which each node senses whether

or not a channel is in use before attempting to transmit informa-

tion. CA is an optimization by which channel time is reserved to

avoid collisions.

DCE — (Data Communication Equipment) — A device, such as

a modem, which connects to a DTE with a serial cable, that

allows a DTE to send and receive data with remote locations.

DTE — (Data Terminal Equipment) — A device, such as a

computer or dumb terminal, which connects to a DCE from its

serial port in order to send and receive data with remote locations.

Download Image — A software file that is used to upgrade the

software code running on the Serial Adapter.

Frequency Hopping — A spread spectrum technique by which

the band is divided into a number of channels and the transmis-

sions hop from channel to channel in a pre-specified sequence.

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Proxim 7910 Guide de l'utilisateur Page 119