Symbol CB3000 - Orthogonal Frequency Division Multiplexing (OFDM); Web Management Support; Wireless Security Support; About WEP Security

CB3000 Client Bridge User Guide
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1.2.4.2 Orthogonal Frequency Division Multiplexing (OFDM)
Orthogonal Frequency Division Multiplexing (OFDM), sometimes referred to as multiple carrier modulation,
divides the available frequency into multiple sub-carriers. 52 sub-carriers are created. Four of the carriers are
used to shift frequencies or as a recommendation to disregard.
The sub-carriers provide data rates of 6, 9, 12, 18, 24, 36, 48, or 54 Mbps for 802.11a and 802.11g supported
devices. These pathways send information in a parallel fashion with a spacing of 0.3125 Mhz.
Because of the orthogonal nature of this method, sub-channels are allowed to overlap, thus using the whole
spectrum efficiently. The aggregate rate of the sub-channels increases the data rate speed to up to 54 Mbps.
Since OFDM divides one high speed channel into multiple lower speed channels, the effect of multi-path
distortion, or delay spread is greatly reduced. With OFDM, less noise (signal disruption) is experienced, since
the frequency can be altered to channels with less interference.
1.2.5 Web Management Support
Connect to the CB3000 by directly entering the CB3000’s IP address within a Web browser or by using the
Symbol CB3000 Discovery Tool to locate the CB3000 within the network and launch the user interface from the
Discovery Tool.
Note By default, only https access is allowed. However, http can be enabled from
the http management link.
The Symbol CB3000 contains a built-in browser interface for system configuration and remote management
using a standard Web browser such as Microsoft Internet Explorer 5.0 or later or Netscape Navigator 6.0 or
later. The browser interface also allows for system monitoring of the CB3000.
Note Web management of the CB3000 requires either Microsoft Internet Explorer
5.0 or later or Netscape Navigator 6.0 or later.
1.2.6 Wireless Security Support
CB3000 includes numerous wireless security provisions. For more details on the security options, see the
following sections:
• About WEP Security
• About WPA1 (TKIP) Security
• About WPA2 (CCMP) Security
• About Secure 802.1x Security
1.2.6.1 About WEP Security
All WLAN devices face possible information theft. Theft occurs when an unauthorized user eavesdrops to
obtain information illegally. The absence of a physical connection makes wireless links particularly vulnerable
to this form of theft. Most forms of security rely on encryption to various extents.