ParkerVision D2D00004 Benutzerhandbuch

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The Service Set Identifi cation (SSID) is a thirty-two alphanumeric character (maximum) 

string identifying the wireless local area network. ParkerVision-Wireless refers to the SSID as 

network name. For stations to communicate with each other, all stations must be confi gured 

with the same SSID. A wireless LAN consisting of nodes operating in Ad-Hoc confi guration 

without an Access Point is called a Basic Service Set (BSS). All nodes in a BSS must use the 

same Basic Service Set ID (BSSID). In an AP (Access Point) confi guration, multiple BSS can 

be confi gured to form an Extended Service Set (ESS). In this confi guration, the Access Points 

are confi gured with the same Extended Service Set ID (ESSID). Wireless clients confi gured 

with the same ESSID can freely roam from one Access Point domain to another and still 

maintain a seamless connection to the network.

Authentication and WEP Encryption

Wireless links are vulnerable to information theft. To provide a certain level of security, IEEE 

802.11 standard has defi ned two types of authentication methods, Open System and Shared 

Key. Open System authentication is a null algorithm. Shared Key authentication is an 

algorithm where both the transmitting node and the receiving node share an authentication 

key to perform a checksum on the original message. By default, IEEE 802.11 wireless 

devices operate in an open system network. Wired Equivalent Privacy (WEP) data encryption 

is utilized when the wireless nodes or access points are confi gured to operate in Shared Key 

authentication mode. ParkerVision-Wireless utilizes the following 802.11b solutions: the 

standard based 64-bit WEP data encryption and 128-bit WEP data encryption. The 64-bit 

WEP data encryption method allows for a fi ve-character (40 bits) KEY. Additionally, 24 

factory-set bits are added to the 40-bit input to generate a 64-bit encryption key. (The 24 

factory-set bits are not user confi gurable.) This encryption key will be used to encrypt/decrypt 

all data transmitted via the wireless interface. The 128-bit WEP data encryption method 

consists of 104 confi gurable bits. Similar to the 64-bit WEP data encryption method, the 

remaining 24 bits are factory set and not user confi gurable.