Mobility Electronics NP644 Manual Do Utilizador

NP644 IEEE 802.11g Wireless Network USB Adaptor

YML787 Rev1

Channel:

The bandwidth which wireless Radio operates is divided into

several segments, which we call them “Channels”. AP and the client

stations that it associated work in one of the channels.

CSMA/CA:

In local area networking, this is the CSMA technique that combines

slotted time -division multiplexing with carrier sense multiple access/

collision detection (CSMA/CD) to avoid having collisions occur a

second time. This works best if the time allocated is short compared

to packet length and if the number of situations is small.

CSMA/CD:

Carrier Sense Multiple Access/Collision Detection, which is a

LAN access method used in Ethernet. When a device wants to

gain access to the network, it checks to see if the network is quiet

(senses the carrier). If it is not, it waits a random amount of time

before retrying. If the network is quiet and two devices access

the line at exactly the same time, their signals collide. When the

collision is detected, they both back off and wait a random amount

of time before retrying.

DHCP:

Dynamic Host Conﬁguration Protocol, which is a protocol that lets

network administrators manage and allocate Internet Protocol

(IP) addresses in a network. Every computer has to have an IP

address in order to communicate with each other in a TCP/IP based

infrastructure network. Without DHCP, each computer must be

entered in manually the IP address. DHCP enables the network

administrators to assign the IP from a central location and each

computer receives an IP address upon plugged with the Ethernet

cable everywhere on the network.