Mobility Electronics NP644 User Manual

NP644 IEEE 802.11g Wireless Network USB Adaptor

YML787 Rev1

DSSS:

Direct Sequence Spread Spectrum. DSSS generates a redundant

bit pattern for each bit to be transmitted. This bit pattern is called

a chip (or chipping code). The longer the chip, the greater the

probability that the original data can be recovered. Even if one or

more bits in the chip are damaged during transmission, statistical

techniques embedded in the radio can recover the original data

without the need for retransmission. To an unintended receiver,

DSSS appears as low power wideband noise and is rejected

(ignored) by most narrowband receivers.

Dynamic IP Address: An IP address that is assigned automatically to a client station in a

TCP/IP network by a DHCP server.

Encryption:

A security method that uses a speciﬁc algorithm to alter the data

transmitted, thus prevent others from knowing the information

transmitted.

ESS:

ESS stands for “Extended Service Set”. More than one BSS is

conﬁgured to become Extended Service Set. LAN mobile users can

roam between different BSSs in an ESS.

ESSID:

The unique identiﬁer that identiﬁes the ESS. In infrastructure

association, the stations use the same ESSID as AP’s to get

connected.

Ethernet:

A popular local area data communications network, originally

developed by Xerox Corp., that accepts transmission from

computers and terminals. Ethernet operates on a 10/100 Mbps

base transmission rate, using a shielded coaxial cable or over

shielded twisted pair telephone wire.