Cisco Linksys NWU11B Wireless USB Network Adapter User Manual NWU11B user guide 5

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Date Submitted	2002-12-05 00:00:00
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Creation Date	2002-11-22 17:35:00
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Network Everywhere®
Connect - To connect to one of the networks on the list, select the wireless network, and click the Connect button. If the wireless network has WEP encryption enabled, you will see the screen shown in Figure 8-5.
Wireless USB Adapter
Profiles
The Profiles screen lets you save different configuration profiles for different
network setups. You can also import or export profiles. The default profile
holds the initial configuration saved when you ran the Setup Wizard.
Figure 8-5
In the WEP drop-down box, select the type of WEP encryption used by the
wireless network: 64-bit, 128-bit, or 152-bit WEP.
Figure 8-6
If the wireless network uses a passphrase, enter the passphrase in the
Passphrase field. If the wireless network uses a WEP key, enter the WEP key
in the Key 1 field.
Profile - Name of the connection profile.
SSID - The wireless network’s unique name, as set in the connection profile.
Click the OK button to complete the network connection and return to the Site
Survey screen, or click the Cancel button to cancel the network connection and
return to the Site Survey screen.
Profile Information
Network Type - The mode of the wireless network currently in use.
Transfer Rate - The data transfer rate of the current connection. (In Auto
mode, the Adapter dynamically shifts to the fastest data transfer rate possible
at any given time.)
Channel - The channel to which the wireless network devices are set.
WEP - The status of the WEP encryption security feature.
On the Site Survey screen, click the X (Close) button in the upper right corner
to exit the WLAN Monitor.
Connect - To connect to a wireless network using a specific profile, select the
profile, and click the Connect button.
Edit - Select a profile, and click the Edit button to change an existing profile.
New - Click the New button to create a new profile. See the next section,
“Creating a New Profile,” for detailed instructions.
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Network Everywhere®
Import - Click the Import button to import a profile that has been saved in
another location. Select the appropriate file, and click the Open button.
Wireless USB Adapter
Creating a New Profile
1. On the Profiles screen, click the New button to create a new profile.
Figure 8-7
Export - To save the profile(s) in a different location, click the Export button.
Direct Windows to the appropriate folder, and click the Save button.
Figure 8-9
2. The Choose a network type screen shows a choice of two wireless modes
(see Figure 8-10). In the Current Profile field, enter the name of the new
profile. Click the Infrastructure Mode radio button if you want your wireless computers to communicate with computers on your wired network via
a wireless access point. Click the Ad-Hoc Mode radio button if you want
multiple wireless computers to communicate directly with each other.
Complete the SSID field. Click the Next button to continue or the Back
button to return to the previous screen.
Current Profile - Enter the name of this profile here.
Infrastructure Mode - This mode allows wireless and wired networks to
communicate through an access point.
Figure 8-8
Note: If you want to export more than one profile, you have to export
them one at a time.
Delete - Click the Delete button to delete a profile.
Click the X (Close) button in the upper right corner to exit the WLAN Monitor.
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Ad-Hoc Mode - This mode allows wireless-equipped computers to communicate directly with each other. No access point is used.
SSID - The SSID is the unique name shared by all devices in a wireless network. The SSID must be identical for all devices in the wireless network. It
is case-sensitive and must not exceed 32 characters (use any of the characters on the keyboard). Make sure this setting is the same for all devices in
your wireless network.
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Network Everywhere®
Wireless USB Adapter
4. The Network Settings screen will appear.
If your network has a DHCP server, click the radio button next to Obtain
an IP address automatically (DHCP). Click the Next button to continue,
or click the Back button to return to the previous screen. Then go to Step 5.
If your network does not have a DHCP server, click the radio button next to
Specify the IP address. Enter an IP Address, Subnet Mask, Default
Gateway, and DNS appropriate for your network. Enter each address in this
format: xxx.xxx.xxx.xxx (the x’s represent the numbers that make up each
address). You must specify the IP Address and Subnet Mask on this screen.
If you are unsure about the Default Gateway and DNS addresses, then leave
these fields alone. Click the Next button to continue, or click the Back button to return to the previous screen. Then go to Step 5.
Figure 8-10
3. If you chose Infrastructure Mode, go to Step 4 now. If you chose Ad-Hoc
Mode, select the correct operating channel for your network. Click the Next
button, and go to Step 4. Click the Back button to change any settings.
IP Address - This IP Address must be unique to your network.
Subnet Mask - The Adapter’s Subnet Mask must be the same as your wired
network’s Subnet Mask.
Default Gateway - Enter the IP address of your network’s Gateway here.
Channel - The channel you choose should match the channel set on the
other devices in your wireless network.
DNS - Enter the DNS addresses of your Ethernet (wired) network here.
Figure 8-11
Figure 8-12
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Network Everywhere®
5. The Security Settings screen will appear. Enable or disable Wired
Equivalent Privacy (WEP) encryption for your wireless network. If you
enable WEP, enter a Passphrase or WEP key. Click the Next button to continue or the Back button to return to the previous screen.
Wireless USB Adapter
6. The Confirm New Settings screen will appear. To save the new settings,
click the Next button. To cancel the settings and return to the Profiles
screen, click the No button. To edit the new settings, click the Back button.
WEP (Disabled/64-bit WEP/128-bit WEP) - If you do not want to use
WEP encryption, choose Disabled. To use WEP encryption (recommended
to increase network security), select 64-bit or 128-bit WEP from the dropdown menu, and enter either a Passphrase or WEP key.
Passphrase - Instead of manually entering WEP keys, you can enter a
Passphrase, so a WEP key is automatically generated. It is case-sensitive and
should not be longer than 16 alphanumeric characters. This passphrase must
match the passphrase of your wireless network and is compatible with
Network Everywhere wireless products only. (If you have any non-Network
Everywhere wireless products, enter the WEP key(s) manually on those
products.)
Key 1 - This WEP key must match the WEP key of your wireless network.
If you are using 64-bit WEP encryption, then the key must consist of exactly 10 hexadecimal characters. If you are using 128-bit WEP encryption,
then the key must consist of exactly 26 hexadecimal characters. Valid hexadecimal characters are “0” to “9” and “A” to “F”.
Figure 8-14
7. The Congratulations screen will appear next. Click Activate Now to implement the new settings immediately and return to the Link Information
screen. Click Activate Later to keep the current settings active and return
to the Profiles screen.
Figure 8-15
Figure 8-13
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You have successfully created a connection profile. Click the X (Close)
button in the upper right corner to exit the WLAN Monitor.
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Network Everywhere®
Appendix A: Troubleshooting
Common Problems and Solutions
This chapter provides solutions to problems that may occur during the installation and operation of the Wireless USB Adapter. Read the descriptions below
to solve your problems. If you can’t find an answer here, check the Network
Everywhere website at www.networkeverywhere.com.
1. My computer does not recognize the Wireless USB Adapter.
• Make sure that the Adapter is properly inserted into the USB port.
• Also, make sure that the USB Controller is enabled in the BIOS. Refer to
your motherboard’s user guide for more information.
2. The Wireless USB Adapter does not work properly.
• Reinsert the Adapter into the notebook or desktop’s USB port.
• For Windows 98SE or Me, right-click My Computer, and select Properties.
Select the Device Manager tab, and select the Adapter. You will find the
Wireless USB Adapter if it has been installed successfully. If you see a yellow exclamation mark, the resources may be in conflict, and you must follow
the steps below:
• Uninstall the driver software from your PC.
• Restart your PC and repeat the hardware and software installation as specified in this User Guide.
3. I cannot communicate with a wired computer linked via an access point in the
infrastructure configuration.
• Make sure that the notebook or desktop PC is powered on.
• Make sure that the Adapter is configured with the same SSID and security
options as the other computers in the infrastructure configuration.
Wireless USB Adapter
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 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.
What IEEE 802.11b features are supported?
The product supports the following IEEE 802.11b functions:
• CSMA/CA plus Acknowledge protocol
• Multi-Channel Roaming
• Automatic Rate Selection
• RTS/CTS feature
• Fragmentation
• Power Management
What is ad-hoc mode?
When a wireless network is set to ad-hoc mode, the wireless-equipped computers 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 continuously while moving freely throughout an area greater than that covered by a single access point. Before using the roaming function, the workstation must make
sure that it is the same channel number with the access point of dedicated coverage area.
Frequently Asked Questions
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 operation over a network.
Can I play computer games with other members of the wireless network?
Yes, as long as the game supports multiple players over a LAN (local area network). Refer to the game’s user guide for more information.
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To achieve true seamless connectivity, the wireless LAN must incorporate a
number of different functions. Each node and access point, for example, must
always acknowledge receipt of each message. Each node must maintain contact
with the wireless network even when not actually transmitting data. Achieving
these functions simultaneously requires a dynamic RF networking technology
that links 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 quality, as well as the message load currently
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Network Everywhere®
being carried by each access point and the distance of each access point to the
wired backbone. Based on that information, the node next selects the right
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 system to determine whether it is in touch with the original access point or whether
it should seek a new one. When a node no longer receives acknowledgment
from its original access point, it undertakes a new search. Upon finding a new
access point, it then re-registers, and the communication process continues.
Wireless USB Adapter
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 feature of scrambling. On the software side, WLAN offers the encryption function
(WEP) to enhance security and access control.
What is WEP?
WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bit
or 128-bit shared key algorithm, as described in the IEEE 802.11 standard.
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 developed by the military for use in reliable, secure, mission-critical communications 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 transmission, 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.
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Network Everywhere®
Appendix B: Glossary
DHCP supports static addresses for computers containing Web servers that
need a permanent IP address.
802.11b - One of the IEEE standards for wireless networking hardware.
Products that adhere to a specific IEEE standard will work with each other,
even if they are manufactured by different companies. The 802.11b standard
specifies a maximum data transfer rate of 11Mbps, an operating frequency of
2.4GHz, and WEP encryption for security. 802.11b networks are also referred
to as Wi-Fi networks.
DNS - The domain name system (DNS) is the way that Internet domain name
are located and translated into Internet Protocol (IP) addresses. A domain name
is a meaningful and easy-to-remember “handle” for an Internet address.
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.
CTS (Clear To Send) - An RS-232 signal sent from the receiving station to the
transmitting station that indicates it is ready to accept data.
Default Gateway - The router used to forward all traffic that is not addressed
to a station within the local subnet.
DHCP (Dynamic Host Configuration Protocol) - A protocol that lets network
administrators manage centrally 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 connection 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 distribute 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 especially useful in education and other environments where users change frequently. Using very short leases, DHCP can dynamically reconfigure networks
in which there are more computers than there are available IP addresses.
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Wireless USB Adapter
DSSS (Direct-Sequence Spread Spectrum) - 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 endpoint), 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 (Extended Service Set) - A set of more than two or more BSSs (multiple
access points) forming a single network.
Firmware - Code that is written onto read-only memory (ROM) or programmable 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—promoting the development and application of electrotechnology and allied sciences
for the benefit of humanity, the advancement of the profession, and the wellbeing 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 several large societies in special areas, such as the
IEEE Computer Society.
Infrastructure Network - An infrastructure network is a group of computers
or other devices, each with a wireless adapter, connected as an 802.11 wireless
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Network Everywhere®
LAN. In infrastructure mode, the wireless devices communicate with each
other and to a wired network by first going through an access point. An infrastructure 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.
Roaming - In an infrastructure mode wireless network, this refers to the ability to move out of one access point's range and into another and transparently
reassociate and reauthenticate to the new access point. This reassociation and
reauthentication should occur without user intervention and ideally without
interruption to network connectivity. A typical scenario would be a location
with multiple access points, where users can physically relocate from one area
to another and easily maintain connectivity.
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 packet 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.
SSID (Service Set Identifier) - An identification name that wireless devices
use to make connections. In order for wireless devices to communicate, they
must all be set to the same channel and they all must use the same SSID. For
instance, if you are using an access point to connect two computers using wireless devices, the access point and each of the wireless devices must use the
same SSID. Even if they are set to the same channel, they cannot communicate
unless the SSID is the same.
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.
Subnet Mask - The method used for splitting IP networks into a series of subgroups, or subnets. The mask is a binary pattern that is matched up with the IP
address to turn part of the host ID address field into a field for subnets.
ISP - An ISP (Internet service provider) is a company that provides individuals
and companies access to the Internet and other related services such as Web site
building and virtual hosting.
TCP (Transmission Control Protocol) - A method (protocol) used along with
the IP (Internet Protocol) to send data in the form of message units (datagram)
between network devices over a LAN or WAN. While IP takes care of handling
the actual delivery of the data (routing), TCP takes care of keeping track of the
individual units of data (called packets) that a message is divided into for efficient delivery over the network. TCP is known as a “connection-oriented” protocol due to requiring the receiver of a packet to return an acknowledgment of
receipt to the sender of the packet resulting in transmission control.
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).
MAC Address - The MAC (Media Access Control) address is your computer’s
unique hardware number.
mIRC - mIRC runs under Windows and provides a graphical interface for logging onto IRC servers and listing, joining and leaving channels.
Network Mask - Also known as the “Subnet Mask.”
Plug-and-Play - The ability of a computer system to configure expansion
boards and other devices automatically without requiring the user to turn off
the system during installation.
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Wireless USB Adapter
Static IP Address - A permanent IP address that is assigned to a node in a
TCP/IP network.
TCP/IP (Transmission Control Protocol/Internet Protocol) - The basic communication language or set of protocols for communications over a network
(developed specifically for the Internet). TCP/IP defines a suite or group of
protocols and not only TCP and IP.
UDP (User Datagram Protocol) - A method (protocol) used along with the IP
(Internet Protocol) to send data in the form of message units (datagram)
between network devices over a LAN or WAN. While IP takes care of handling
the actual delivery of the data (routing), UDP takes care of keeping track of the
individual units of data (called packets) that a message is divided into for effi37
Network Everywhere®
cient delivery over the network. UDP is known as a “connection-less” protocol
due to NOT requiring the receiver of a packet to return an acknowledgment of
receipt to the sender of the packet (as opposed to TCP).
WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64bit shared key algorithm, as described in the IEEE 802.11b standard.
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Wireless USB Adapter
Appendix C: Specifications
Standards
IEEE 802.11b, USB 1.1
Channels
11 Channels (USA)
WINIPCFG - Configuration utility based on the Win32 API for querying,
defining and managing IP addresses within a network. A commonly used utility under Windows 95, 98, and Me.
Port
USB
WLAN (Wireless Local Area Network) - A group of computers and associated devices that communicate with each other wirelessly.
Transmit
(typical)
18 dBm
Receive Sensitivity
(typical)
-84 dBm
Modulation
CCK, DQPSK, DBPSK
Network Protocols
TCP/IP
LEDs
Link, Power
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Network Everywhere®
Appendix D: Warranty Information
Environmental
Dimensions
3.58" x 2.80" x 0.91"
(91 mm x 71 mm x 23 mm)
Unit Weight
2.82 oz. (0.08 kg)
Power
Supplied by PC’s USB port
Certifications
FCC Class B, Wi-Fi
Operating Temp.
32ºF to 131ºF (0ºC to 55ºC)
Storage Temp.
-13ºF to 158ºF (-25ºC to 70ºC)
Operating Humidity 0% to 70%, Non-Condensing
Storage Humidity
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Wireless USB Adapter
10% to 90%, Non-Condensing
BE SURE TO HAVE YOUR PROOF OF PURCHASE AND A BARCODE
FROM THE PRODUCT’S PACKAGING ON HAND WHEN CALLING.
RETURN REQUESTS CANNOT BE PROCESSED WITHOUT PROOF OF
PURCHASE.
IN NO EVENT SHALL NETWORK EVERYWHERE’S LIABILITY
EXCEED THE PRICE PAID FOR THE PRODUCT FROM DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
RESULTING FROM THE USE OF THE PRODUCT, ITS ACCOMPANYING
SOFTWARE, OR ITS DOCUMENTATION. NETWORK EVERYWHERE
DOES NOT OFFER REFUNDS FOR ANY PRODUCT.
NETWORK EVERYWHERE OFFERS CROSS SHIPMENTS, A FASTER
PROCESS FOR PROCESSING AND RECEIVING YOUR REPLACEMENT.
NETWORK EVERYWHERE PAYS FOR UPS GROUND ONLY. ALL CUSTOMERS LOCATED OUTSIDE OF THE UNITED STATES OF AMERICA
AND CANADA SHALL BE HELD RESPONSIBLE FOR SHIPPING AND
HANDLING CHARGES. PLEASE CALL NETWORK EVERYWHERE FOR
MORE DETAILS.
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Network Everywhere®
Appendix E: Contact Information
For help with the installation or operation of the Wireless USB Adapter, contact Network Everywhere Technical Support at one of the phone numbers or
Internet addresses below.
Technical Support
Fax
E-mail
Web site
42
949-271-5470, M-F, 8:00 am to 5:00 pm (PST)
949-265-6655
support@NetworkEverywhere.com
http://www.NetworkEverywhere.com
h t t p : / / w w w. N e t wo r k E v e r y w h e r e . c o m
© Copyright 2002 Network Everywhere, All Rights Reserved.
Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct the interference by one of the
following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
- Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: To assure continued compliance, any changes or modifications not expressly
approved by the party responsible for compliance could void the user's authority to operate this
equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
IMPORTANT NOTE:
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with minimum distance 20cm
between the radiator & your body.
This transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.

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