Mobility Electronics NP644 사용자 설명서

NP644 IEEE 802.11g Wireless Network USB Adaptor

YML787 Rev1

Preamble:

The ‘preamble’ is a sequence of bits transmitted at 1Mbps that

synchronises wireless transmission within the network. The Short

Preamble and header may be used to minimize overhead and,

thus, maximize the network data throughput. However, the Short

Preamble is supported only by the IEEE 802.11b (High- Rate)

standard and not by the original IEEE 802.11standard; meaning that

stations using Short-Preamble cannot communicate with stations

implementing the original version of the protocol.

PSDU:

PLCP service data unit

Roaming:

A LAN mobile user moves around an ESS and enjoys a continuous

connection to an Infrastructure network.

RTS:

Request To Send. An RS-232 signal sent from the transmitting

station to the receiving station requesting permission to transmit.

RTS Threshold:

Transmitters contending for the medium may not be aware of each

other. RTS/CTS mechanism can solve this “Hidden Node Problem”.

If the packet size is smaller than the preset RTS Threshold size, the

RTS/CTS mechanism will NOT be enabled.

SSID:

Service Set Identiﬁer, which is a unique name shared among all

clients and nodes in a wireless network. The SSID must be identical

for each clients and nodes in the wireless network.