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Wireless Ethernet Bridge
HELP
The
HELP
screen offers additional explanations about the terms used on each
screen of the Utility, plus contact information for additional assistance.
27
Instant Wireless
TM
Series
ADMIN
The
Admin
screen allows you to change the password, reboot the Bridge, or
reset all settings to their factory defaults. If you have changed any settings, it is
necessary to reboot the Bridge for the new settings to take effect (click the
Reboot
button). Any changes in these three settings: password, device name,
and enabling uploads, however, are effective immediately.
Change password
- Set or change the network password required to access
the utility. The default password is
admin
.
Reboot WET11
- After you have made changes through any of the screens,
click this button to enable the new settings.
Reset to factory defaults
- Resets all configuration settings to their default
values.
26
Figure 6-7
Note:
You may have to refresh this page to see any new settings.
Figure 6-6
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Wireless Ethernet Bridge
5.
The Web-Based Utility won’t open.
Make sure that you have a LAN card (also known as a network adapter)
installed on the PC so you can use the Web-Based Utility.
6.
The Web-Based Utility does not recognize my password.
The password is case-sensitive. Make sure you are using the correct case(s)
when entering the password.
If you forget your password, you can push the Bridge’s Reset button. This
will reset the password to the default setting; however, all other Bridge set-
tings will be reset to the factory defaults as well. To use the default settings,
leave the
User Name
field blank, and enter
admin
in the
Password
field.
Can I run an application from a remote computer over the wireless network?
This will depend on whether or not the application is designed to be used over
a network. Consult the application’s user guide to determine if it supports oper-
ation over a network.
Can I play multiplayer games with other users of the wireless network?
Yes, as long as the game supports multiple players over a LAN. Refer to the
game’s user guide for more information.
What is the IEEE 802.11b standard?
It is one of the IEEE standards for wireless networks. The 802.11b standard
allows wireless networking hardware from different manufacturers to commu-
nicate, provided that the hardware complies with the 802.11b standard. The
802.11b standard states a maximum data transfer rate of 11Mbps and an oper-
ating frequency of 2.4GHz.
What IEEE 802.11b features are supported?
The product supports the following IEEE 802.11 functions:
CSMA/CA plus Acknowledge protocol
Multi-Channel Roaming
Automatic Rate Selection
RTS/CTS feature
Fragmentation
Power Management
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Instant Wireless
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28
Frequently Asked Questions
Appendix A: Troubleshooting
This section provides possible solutions to problems regarding the installation and
operation of the Wireless Ethernet Bridge. If you can’t find an answer here, check
the Linksys website at
www.linksys.com
.
1.
I can’t connect to the access point.
Open the Web-Based Utility. Click the
Wireless
tab and perform the follow-
ing steps:
• Verify that the operating mode is set to Infrastructure mode.
• Make sure that the SSID is the same as the SSID of the access point.
• Make sure that all of the WEP settings are the same as the WEP settings
of the access point.
2.
I don’t know how to change the Bridge’s IP address.
You have two ways to change the Bridge’s IP address.
• Open the Web-Based Utility. Click the
IP Addr
tab, and change the IP
address there.
If you encounter problems, power the Bridge off and on again, or push the
Reset button. Then try to change the IP address again.
3.
The Bridge-enabled PC won’t communicate with a wireless-enabled PC or
printer.
Perform the following steps:
Check that the wireless-enabled PC or printer is on the same wireless net-
work as the PC using the Bridge.
Make sure that the SSID and operating mode are the same for all devices
connected to the same wireless network.
• If the wireless LAN settings are okay, make sure that all the devices are
on the same IP network.
4.
The Web-Based Utility doesn’t detect the Bridge.
Make sure that the Ethernet cable is properly connected and that the LAN
LED is lit. If the LED is not lit, change the position of the
X-II
selection
switch on the Bridge’s rear panel. Use the
X
setting if you are connecting
the Bridge to a network card or other Ethernet device. Use the
II
setting if
you are connecting the Bridge to a hub or switch.
Common Problems and Solutions
Page 18 / 24
Wireless Ethernet Bridge
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Instant Wireless
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30
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).
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?
Instant Wireless products feature two-fold protection in security. On the hard-
ware side, as with Direct Sequence Spread Spectrum technology, it has the
inherent security feature of scrambling. On the software side, Instant Wireless
products offer the encryption function (WEP) to enhance security and access
control. Users can set it up depending upon their needs.
What is ad-hoc mode?
When a wireless network is set to ad-hoc mode, the wireless-equipped com-
puters are configured to communicate directly with each other. The ad-hoc
wireless network will not communicate with any wired network.
What is infrastructure mode?
When a wireless network is set to infrastructure mode, the wireless network is
configured to communicate with a wired network through a wireless access
point.
What is roaming?
Roaming is the ability of a portable computer user to communicate continu-
ously while moving freely throughout an area greater than that covered by a sin-
gle wireless network access point. Before using the roaming function, the
workstation must make sure that it is the same channel number as the wireless
network access point of the dedicated coverage area.
To achieve true seamless connectivity, the wireless LAN must incorporate a
number of different functions. Each node and wireless network access point,
for example, must always acknowledge receipt of each message. Each node
must maintain contact with the wireless network even when not actually trans-
mitting data. Achieving these functions simultaneously requires a dynamic RF
networking technology that links wireless network access points and nodes. In
such a system, the user’s end node undertakes a search for the best possible
access to the system. First, it evaluates such factors as signal strength and qual-
ity, as well as the message load currently being carried by each wireless net-
work access point and the distance of each wireless network access point to the
wired backbone. Based on that information, the node next selects the right
wireless network access point and registers its address. Communications
between end node and host computer can then be transmitted up and down the
backbone.
As the user moves on, the end node’s 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.
Page 19 / 24
Wireless Ethernet Bridge
33
Instant Wireless
TM
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32
Appendix B: Glossary
Ad-hoc Network
- An ad-hoc network is a group of computers, each with a
wireless adapter, connected as an independent 802.11 wireless LAN.
Ad-hoc
wireless computers operate on a peer-to-peer basis, communicating directly
with each other without the use of an access point.
Ad-hoc mode is also
referred to as an Independent Basic Service Set (IBSS) or as peer-to-peer
mode, and is useful at a departmental scale or SOHO operation.
Default Gateway
- The router used to forward all traffic that is not addressed
to a station within the local subnet.
DHCP
(
D
ynamic
H
ost
C
onfiguration
P
rotocol) - A protocol that lets network
administrators centrally manage and automate the assignment of Internet
Protocol (IP) addresses in an organization's network. Using the Internet's set of
protocol (TCP/IP), each machine that can connect to the Internet needs a
unique IP address. When an organization sets up its computer users with a con-
nection to the Internet, an IP address must be assigned to each machine.
Without DHCP, the IP address must be entered manually at each computer and,
if computers move to another location in another part of the network, a new IP
address must be entered. DHCP lets a network administrator supervise and dis-
tribute IP addresses from a central point and automatically sends a new IP
address when a computer is plugged into a different place in the network.
DHCP uses the concept of a “lease” or amount of time that a given IP address
will be valid for a computer. The lease time can vary depending on how long a
user is likely to require the Internet connection at a particular location. It’s espe-
cially useful in education and other environments where users change fre-
quently. Using very short leases, DHCP can dynamically reconfigure networks
in which there are more computers than there are available IP addresses.
DHCP supports static addresses for computers containing Web servers that
need a permanent IP address.
DNS
- The Domain Name System (DNS) is the way that Internet domain
names are located and translated into Internet Protocol (IP) addresses. A
domain name is a meaningful and easy-to-remember “handle” for an Internet
address.
Can Instant Wireless products support file and printer sharing?
Instant Wireless products perform the same function as LAN products.
Therefore, Instant Wireless 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 40/64
bit shared key algorithm, as described in the IEEE 802.11 standard.
Page 20 / 24
Wireless Ethernet Bridge
IEEE 802.11b
- One of the IEEE standards for wireless networks. The 802.11b
standard allows wireless networking hardware from different manufacturers to
communicate, provided that the hardware complies with the 802.11b standard.
The 802.11b standard states a maximum data transfer rate of 11Mbps and an
operating frequency of 2.4GHz.
Infrastructure Network
- An infrastructure network is a group of computers
or other devices, each with a wireless adapter, connected as an 802.11 wireless
LAN.
In infrastructure mode, the wireless devices communicate with each
other and to a wired network by first going through an access point.
An infra-
structure wireless network connected to a wired network is referred to as a
Basic Service Set (BSS).
A set of two or more BSS in a single network is
referred to as an Extended Service Set (ESS).
Infrastructure mode is useful at
a corporation scale, or when it is necessary to connect the wired and wireless
networks.
IP Address
- In the most widely installed level of the Internet Protocol (IP)
today, an IP address is a 32-binary digit number that identifies each sender or
receiver of information that is sent in packets across the Internet. When you
request an HTML page or send e-mail, the Internet Protocol part of TCP/IP
includes your IP address in the message (actually, in each of the packets if more
than one is required) and sends it to the IP address that is obtained by looking
up the domain name in the Uniform Resource Locator you requested or in the
e-mail address you're sending a note to. At the other end, the recipient can see
the IP address of the Web page requester or the e-mail sender and can respond
by sending another message using the IP address it received.
IPCONFIG
- A utility that provides for querying, defining and managing IP
addresses within a network.
A commonly used utility, under Windows NT and
2000, for configuring networks with static IP addresses.
ISP
- An ISP (Internet service provider) is a company that provides individuals
and companies access to the Internet and other related services such as website
building and virtual hosting.
LAN
- A local area network (LAN) is a group of computers and associated
devices that share a common communications line and typically share the
resources of a single processor or server within a small geographic area (for
example, within an office building).
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Instant Wireless
TM
Series
34
DSSS
(
D
irect-
S
equence
S
pread
S
pectrum) - DSSS generates a redundant bit
pattern for all transmitted data. This bit pattern is called a chip (or chipping
code).
Even if one or more bits in the chip are damaged during transmission,
statistical techniques embedded in the receiver 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.
However, to an intended receiver (i.e. another wireless LAN end-
point), the DSSS signal is recognized as the only valid signal, and interference
is inherently rejected (ignored).
Dynamic IP Address
- An IP address that is automatically assigned to a client
station in a TCP/IP network, typically by a DHCP server. Network devices that
serve multiple users, such as servers and printers, are usually assigned static IP
addresses.
ESS
(
E
xtended
S
ervice
S
et) - A set of more than two or more BSSs (multiple
access points) forming a single network.
FHSS
(
F
requency
H
opping
S
pread
S
pectrum) - FHSS continuously changes
(hops) the carrier frequency of a conventional carrier several times per second
according to a pseudo-random set of channels. Because a fixed frequency is not
used, and only the transmitter and receiver know the hop patterns, interception
of FHSS is extremely difficult.
Firmware
- Code that is written onto read-only memory (ROM) or program-
mable read-only memory (PROM).
Once firmware has been written onto the
ROM or PROM, it is retained even when the device is turned off.
IEEE
- The Institute of Electrical and Electronics Engineers. The IEEE
describes itself as “the world's largest technical professional society—promot-
ing the development and application of electrotechnology and allied sciences
for the benefit of humanity, the advancement of the profession, and the well-
being of our members.”
The IEEE fosters the development of standards that often become national and
international standards. The organization publishes a number of journals, has
many local chapters, and has several large societies in special areas, such as the
IEEE Computer Society.

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