Application Note 9864

The IEEE 802.11 protocols are implemented in the firmware so that file transfers or database access can begin immediately.

Direct Sequence Spread Spectrum Approach

The use of spread spectrum techniques for wireless computer communications is widely accepted because of its robustness against multipath effects and interference from intentional or unintentional radiators. The use of spread spectrum techniques in the ISM frequency band also allows products to be deployed without the need for an FCC license.

The two main methods by which spread spectrum communications can be achieved are Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS). This wireless LAN PC card uses the DSSS technique. DSSS transmission has the best performance in terms of multipath immunity and jamming rejection. In an office environment, jamming sources are likely to be unintentional such as emissions from microwave ovens. Even though unintentional, they pose a threat to the communications network. Direct sequence techniques are superior to frequency hopping systems in this case because FHSS gains its immunity to jamming by avoiding the location of a single tone jammer (such as other FHSS users). When collisions occur, data is lost. With a DSSS system, the despreading function in the receiver gives immunity to jamming by spreading the interfering energy by the Pseudo Random Number (PN) code over the whole bandwidth. This selective despreading attenuates the jamming power while despreading the desired signal.

In the office environment, multipath effects may degrade network communications. Direct sequence techniques offer better protection than slower frequency hopping systems in the presence of multipath interference. With frequency hopped systems, if the hopper jumps to a frequency where a null resides, then data is lost until the next hop. Multipath signals can be thought of as a special case of unintentional jamming. In the DSSS approach, nulls resulting from multipath fading only eliminate a fraction of the signal power since the bandwidth in the DSSS case is very large. A significant amount of energy still remains in the signal and effective despreading still occurs. The probability of burst errors is reduced significantly.

An often overlooked factor when comparing IEEE 802.11 compliant DSSS and FSSS implementations, is the achievable data rate. A frequency hopping occupied bandwidth of 1MHz as specified by the FCC acts as a limitation when using data rates beyond 2Mbps. A similar bandwidth limitation has not been imposed when using the direct sequence implementation. In the new 802.11 high data rate (11Mbps) standard utilizing Complementary Code Keying (CCK) modulation, the 5-1/2 times increase in data rate has been achieved in the same 17MHz bandwidth! This

is accomplished by encoding 6 bits of data in one out of a possible 64 orthogonal PN spreading sequences. More information on the new high data rate standard may be found in Applications Note AN9850 “Complementary Code Keying Made Simple” which may be found on the Intersil Web Site.

Installation of HWB3163 Windows 95/98 Drivers

Step 1. With the PRISM PCMCIA card removed, boot your PC under Microsoft Windows 95 or 98.

Step 2. Once your system has booted and is idle, insert PRISM II Driver for Windows, Disk #1 into the “A” Floppy Drive. On the Desktop, left click on <Start> -> <RUN> then type A:SETUP <Enter> Follow the on-screen instructions. Accept all defaults.

Step 3. When the preliminary installation is complete, insert the wireless LAN PC card in the lower PCMCIA slot (see Hardware Installation below).

Step 4. Windows should automatically recognize that the card has been inserted. It then displays a dialog box titled “New Hardware Found”.

Step 5. Insert PRISM II Driver for Windows, Disk #1 into the floppy drive. Tell Windows that the driver is located on drive “A”. Accept all defaults.

Step 6. Follow the on-screen instructions to complete installation of the driver. When complete, the NDC driver icon should appear in the system area on the desktop (computer monitor with antenna). Clicking on this icon enables setting of channel, mode, etc.

Step 7. If operating in the Pseudo IBSS mode, you must assign a unique IP address to the computer in order for the card to be operable. Left click on <Start> -> <Settings> -> <Control Panel> . Double click on Network. Select TCP/IP ... PRISM IEEE 802.11 PC Card .... and click on Properties. Select the IP Address tab. Click on Obtain an IP Address. Enter a valid IP address. Enter a valid Subnet Mask (suggest 255 255 255 0). Click

on OK.

PRISM Test Utility (PTU) Software Installation

NOTE: Perform after Windows Driver Installation.

Step 1. Insert the PTU disk #1 into the floppy drive.

Step 2. On the Desktop, left click on <Start> -> <RUN> then type A:setup <Enter>. Follow the on-screen instructions. Accept all defaults. When the installation is complete, an icon should automatically appear on the Desktop.

2

Page 1 Page 3
Page 2
Image 2
NDC comm Application Note, Installation of HWB3163 Windows 95/98 Drivers, Prism Test Utility PTU Software Installation
Page 1 Page 3

HWB3163 specifications

The NDC comm HWB3163 is a cutting-edge wireless broadband device designed to enhance connectivity in both enterprise and residential environments. This powerful hardware bridges the gap between high-speed internet access and the need for reliable, uninterrupted service across multiple devices.

One of the main features of the HWB3163 is its advanced MIMO (Multiple Input, Multiple Output) technology. This feature boosts the device's ability to manage multiple data streams simultaneously, resulting in increased throughput and improved performance. MIMO significantly enhances the connection quality, particularly in environments with multiple users or devices, making it ideal for both home and office setups.

The HWB3163 also incorporates the latest Wi-Fi 6 (802.11ax) technology, which is designed to deliver faster speeds, higher capacity, and improved performance in congested areas. Wi-Fi 6 enhances the user experience by supporting more simultaneous connections and minimizing latency. This is essential for environments where multiple devices are connected, such as smart homes or busy workplaces.

Another noteworthy characteristic of the NDC comm HWB3163 is its comprehensive security features. The device includes advanced encryption protocols such as WPA3, ensuring that users' data remains secure while being transmitted over the network. This added layer of security is crucial for protecting sensitive information, particularly in business settings where data integrity is paramount.

In addition to its robust technical specifications, the HWB3163 is designed with user-friendliness in mind. The intuitive web-based interface allows for easy setup and management, making it accessible even for those with minimal technical expertise. The device supports remote management, allowing users to monitor performance and troubleshoot issues from anywhere.

The NDC comm HWB3163 is equipped with multiple Ethernet ports, allowing for easy wired connections to devices such as computers, printers, and smart TVs. This versatility ensures that users can benefit from both wired and wireless connectivity, optimizing their network capabilities.

In conclusion, the NDC comm HWB3163 is a sophisticated wireless broadband solution that combines advanced technologies and user-friendly features. With its MIMO technology, Wi-Fi 6 support, robust security measures, and intuitive management options, it stands out as a versatile choice for users seeking reliable and high-speed internet connectivity. Whether for home use or in a business environment, the HWB3163 meets the demands of modern internet usage, ensuring that users stay connected and productive.
Top Page Image Contents