HZ1500 Wireless LAN Card
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4.2 Confi guration - Using the D2D/Horizons Confi guration GUI - Continued
MORE ON SSID
Service Set Identifi cation (SSID)
The Service Set Identifi cation (SSID) is a thirty-two alphanumeric character (maximum) string
identifying the wireless local area network. Horizons-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.
MORE ON WEP ENCRYPTION
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. Horizons-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.
