Instant WirelessTM Series

As the user moves on, the end nodes RF transmitter regularly checks the sys- tem to determine whether it is in touch with the original Wireless Network Access Point or whether it should seek a new one. When a node no longer receives acknowledgment from its original Wireless Network Access Point, it undertakes a new search. Upon finding a new Wireless Network Access Point, it then re-registers, and the communication process continues.

What is BSS ID?

A specific Ad hoc LAN is called a Basic Service Set (BSS). Computers in a BSS must be configured with the same BSS ID.

What is ESS ID?

An Infrastructure configuration could also support roaming capability for mobile workers. More than one BSS can be configured as an Extended Service Set (ESS). Users within an ESS could Roam freely between BSSs while main- taining a continuous connection to the wireless network stations and Wireless Network Access Points.

What is ISM band?

The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM (Industrial, Scientific and Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular, is being made available worldwide. This presents a truly revolutionary opportunity to place convenient high speed wireless capabilities in the hands of users around the globe.

What is Spread Spectrum?

Spread Spectrum technology is a wideband radio frequency technique devel- oped by the military for use in reliable, secure, mission-critical communica- tions systems. It is designed to trade off bandwidth efficiency for reliability, integrity, and security. In other words, more bandwidth is consumed than in the case of narrowband transmission, but the trade off produces a signal that is, in effect, louder and thus easier to detect, provided that the receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is not tuned to the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

Wireless Network Access Point

What is DSSS? What is FHSS? And what are their differences?

Frequency-hopping spread-spectrum (FHSS) uses a narrowband carrier that changes frequency in a pattern that is known to both transmitter and receiver. Properly synchronized, the net effect is to maintain a single logical channel. To an unintended receiver, FHSS appears to be short-duration impulse noise. Direct-sequence spread-spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip (or chipping code). The longer the chip, the greater the probability that the original data can be recovered. Even if one or more bits in the chip are damaged during transmis- sion, statistical techniques embedded in the radio can recover the original data without -the need for retransmission. To an unintended receiver, DSSS appears as low power wideband noise and is rejected (ignored) by most narrowband receivers.

Would the information be intercepted while transmitting on air?

WLAN features two-fold protection in security. On the hardware side, as with Direct Sequence Spread Spectrum technology, it has the inherent security fea- ture of scrambling. On the software side, WLAN series offer the encryption function (WEP) to enhance security and Access Control. Users can set it up depending upon their needs.

Can Instant WirelessTM products support file and printer sharing?

Instant WirelessTM products perform the same function as LAN products. Therefore, Instant WirelessTM products can work with Netware, Windows NT/2000, or other LAN operating systems to support printer or file sharing.

What is WEP?

WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 40 bit shared key algorithm, as described in the IEEE 802.11 standard.

What is a MAC Address?

The MAC (Media Access Control) address is a unique number assigned by the manufacturer to any Ethernet networking device, such as a network adapter, that allows the network to identify it at the hardware level. For all practical pur- poses, this number is usually permanent. Unlike IP addresses, which can change every time a computer logs on to the network, a MAC address of a device stays the same, making it a valuable identifier for the network.

42

43

Page 23 Page 25
Page 24
Image 24
Linksys WAP11 manual What is BSS ID?, What is ESS ID?, What is ISM band?, What is Spread Spectrum?, What is WEP?
Page 23 Page 25

WAP11 specifications

The Linksys WAP11 is a versatile and influential device in the realm of wireless networking. Released in the early 2000s, this wireless access point was designed to offer seamless connectivity for users who required reliable internet access without the constraints of wired connections. The WAP11 quickly became popular for home and office environments, allowing multiple devices to connect to the internet wirelessly.

One of the standout features of the Linksys WAP11 is its compliance with the IEEE 802.11b wireless networking standard. This standard enabled the WAP11 to deliver a maximum data transfer rate of up to 11 Mbps, which was impressive at the time of its launch. It also supported backward compatibility with 802.11g devices, enabling a broader range of connectivity options for users.

The WAP11 utilizes both infrastructure and ad-hoc modes, catering to various networking setups. The infrastructure mode allows for connection through a wireless router or switch, while the ad-hoc mode facilitates a peer-to-peer connection among multiple devices. This flexibility makes the WAP11 suitable for both small home networks and larger office settings.

Another notable characteristic of the WAP11 is its range and coverage capability. The device operates on the 2.4 GHz frequency and is designed to provide coverage in a typical home or small office. When deployed in an environment with minimal obstacles, the WAP11 offers a considerable range, ensuring that users can connect from various locations within the premises.

Security features are also a significant aspect of the WAP11. It supports Wired Equivalent Privacy (WEP) encryption, providing a basic level of security to protect data transmitted across the wireless network. While WEP has since been superseded by more robust security protocols like WPA and WPA2, it was a necessary feature for its time, giving users peace of mind regarding their data protection.

Installation and setup of the Linksys WAP11 are user-friendly, making it accessible even for individuals with minimal technical experience. The device comes with a web-based interface that allows users to configure settings, adjust security parameters, and troubleshoot network issues with ease.

In summary, the Linksys WAP11 is a remarkable wireless access point that laid the groundwork for the wireless networking standards we now take for granted. With its support for 802.11b, flexible operating modes, decent range, and user-friendly configuration, the WAP11 provided a reliable solution for expanding wireless connectivity. Its influence can be seen in the ongoing evolution of wireless networking technologies, emphasizing the importance of connectivity in our increasingly digital world.
Top Page Image Contents