Samsung MagicLAN SWL-2300U User Manual

connection or delay in accessing the resources of the network.• Scanning, Beaconing & ESS IDWhen a wireless client is initialized, it is necessary for it to find and communicate with thecorrect group of wireless devices, including AP. At this point, it may search for all thefrequency channels and this process is called scanning.There may be multiple APs and networks operating at the same time. It may be necessaryto ensure that the station joins with the correct network during the scanning process. Toachieve this, each AP is assigned to be part of a logical group called the Extended ServiceSet (ESS). The name of this logical group is the ESS ID. When roaming is operating, theremay be several Access Points as part of the same ESS.After the power on, wireless clients will listen on its default frequency channel. It will belistening for beacons sent by another wireless station or AP. Beacon is a short messagecontaining the ESS ID that will be broadcast roughly ten times a second. When the wirelessstation hears a beacon and the ESS ID in the beacon matches its own, the client knows thatit is on the correct channel and can communicate with its group. If no beacons are seen, orif the ESS ID does not match, the wireless client may move to the next frequency channeland repeat this listening procedure.In case of direct sequence spread spectrum (DSSS) physical layer, this scanning processoccurs at start up and may also occur when the client roams between APs.1.3 MagicLAN Overview• The MagicLAN SWL-2300U(USB Adapter) ar e wireless LAN adapter that providewireless connection between computers.• The MagicLAN is designed to operate with IEEE 802.11 (wireless LAN InternationalStandard) wireless compliant radio cards and uses a CSMA/CA (Collision Sense MultipleAccess with Collision Avoidance) algorithm as the media access scheme, which makeshigh speed communication (with minimal collision probability) possible.• The MagicLAN supports DSSS (Direct Sequence Spread Spectrum) physical layer. Thisis a radio technique, which scrambles the data prior to transmission and uses a correlationtechnique on receiver to improve the signal to noise ratio and makes it possible tocommunicate in the office having a wall and a compartment.