Cisco Linksys WAP54G Wireless-G Access Point User Manual WAP54G user guide

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Instant Wireless® Series
Note: In Wireless Bridge mode, the Access Point can ONLY be
accessed by another access point in Wireless Bridge mode. In order
for your other wireless devices to access the Access Point, you must
reset it to Access Point mode. The two modes are mutually exclusive.
Wireless-G Access Point
The Status Tab
The Status tab, shown in Figure 6-8, will display current information on the
Access Point, its settings, and its performance.
Figure 6-7
Figure 6-8
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•
Firmware Version. The current version of the Access Point’s firmware is
displayed. Firmware should only be upgraded from the Help tab if you
experience problems with the Access Point.
•
AP Name. This displays the name you assigned to the Access Point.
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Wireless-G Access Point
LAN
The Log Tab
•
MAC Address. The MAC Address of the LAN interface is displayed here.
To view a log of the Access Point’s activity, select the Log tab, shown in Figure
6-9.
•
Configuration Type. This displays how the Access Point is assigned an IP
address, either Automatic Configuration - DHCP, if assigned by DHCP
server, or Static IP Address and its IP Address, Subnet Mask, and Default
Gateway address, if assigned by Static IP Address server.
•
IP Address. This IP address is the unique IP address of the Access Point.
•
Subnet Mask. The Access Point’s Subnet Mask (also known as an IP
Mask), matches the Subnet Mask of your Ethernet network.
Wireless
•
MAC Address. The MAC Address of the LAN interface is displayed here.
Figure 6-9
•
SSID. The unique name shared among all points in your wireless network
is displayed here.
Log. To enable permanent logging activity, click the Enable radio button
beside Log. The default setting for this function is Disable.
•
Mode. The Access Point’s mode is displayed here.
•
Channel. The wireless channel shared by all wireless devices connected to
this Access Point is displayed here.
•
Encryption Function. The encryption method you chose in the Setup
Wizard or changed from the Setup tab of this Web-based Utility is displayed
here.
If you have chosen to monitor the Access Point’s traffic, then you can designate
a PC that will receive permanent log files periodically. In the Send Log to field,
enter the IP address of this PC. To view these permanent logs, you must use
Logviewer software, which can be downloaded free of charge from
www.linksys.com.
•
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Send and Receive. The Send and Receive fields display the number of successful or dropped packets that have been sent or received. Some packet
loss is normal in wireless networking.
To see a temporary log of the Access Point’s most recent activities, click the
View Log button.
Click the Apply button to apply your changes or Cancel to cancel your
changes. If you require online help, click the Help button.
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Wireless-G Access Point
The Help Tab
To upgrade the Access Point’s firmware:
For help on the various tabs in this Web-based Utility, along with upgrading the
Access Point’s firmware and viewing this User Guide, click the Help tab,
shown in Figure 6-10.
1. Download the firmware upgrade file from the Linksys website.
2. Extract the firmware upgrade file.
3. Click the Upgrade Firmware button on the Help screen.
The help files for the various tabs in this Web-based Utility are listed by tab
name on the lefthand side of the screen.
Figure 6-11
4. Enter the location of the firmware upgrade file in the File Path field, or
click the Browse button to find the firmware upgrade file.
5. Double-click the firmware upgrade file.
6. Click the Upgrade button, and follow the on-screen instructions.
Click the Cancel button to cancel the firmware upgrade.
Figure 6-10
Click the Linksys Website link to connect to the Linksys home page for
Knowledgebase help files and information about other Linksys products, provided you have an active Internet connection.
For an Online manual in PDF format, click that text link. The User Guide will
appear in Adobe pdf format. If you do not have the Adobe PDF Reader installed
on your computer, click the Adobe Website link or go to the Setup Wizard CDROM to download this software. (To access the Adobe website, you will need an
active Internet connection.) To download from the CD-ROM, click the Start button and select Run. Type D:\Acrobat (if “D” is the letter of your CD-ROM drive).
New firmware versions are posted at www.linksys.com and can be downloaded
for free. If the Access Point is not experiencing difficulties, then there is no
need to download a more recent firmware version, unless that version has a
new feature that you want to use. Loading new firmware does not always
enhance the speed or quality of your Internet connection.
The Filter Tab
To access the Filter tab, first click the Advanced tab. The Filter tab, shown in
Figure 6-12, allows you to control which computers may or may not communicate with the Access Point—depending on their MAC addresses.
To enable filtering of computers by their MAC Addresses, click the Enable
radio button. To disable this feature, click the default Disable radio button.
Next, determine if the Access Point will Prevent or Permit access to the PCs
you will specify. If you want to block specific PCs from communicating with
with the Access Point, click the radio button next to Prevent PCs listed below
from accessing the wireless network. If you want to allow specific PCs from
communicating with with the Access Point, click the radio button next to
Permit PCs listed below from accessing the wireless network.
Note: When you upgrade the Access Point’s firmware, you may
lose the Access Point’s current configuration settings.
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Wireless-G Access Point
The Advanced Wireless Tab
Figure 6-13
Figure 6-12
Above the MAC Address fields, there is a pull-down menu. This pull-down
menu is for selecting the number of computers on your wireless network. For
computers one through ten on your wireless network, 1~20 is selected by
default. If you have more than twenty computers on your wireless network, use
this pull-down menu to select 21~40.
•
Authentication Type. The default is set to Auto, where it auto-detects for
Shared Key or Open System. Shared Key is when both the sender and the
recipient share a WEP key for authentication. Open Key is when the sender
and the recipient do not share a WEP key for authentication. All points on
your network must use the same authentication type.
Then, type the MAC Address(es) you wish to filter in the MAC Address fields.
Do not use colons when entering the digits. Use a xxxxxxxxxxxx format with
the x’s representing the actual characters of the MAC address. If you want to
clear the MAC addresses you entered, click the Clear button .
•
Transmission Rates. The default setting is Auto. The range is from 1 to
54Mbps. The rate of data transmission should be set depending on the speed
of your wireless network. You can select from a range of transmission
speeds, or you can keep the default setting, Auto, to have the Access Point
automatically use the fastest possible data rate and enable the Auto-Fallback
feature. Auto-Fallback will negotiate the best possible connection speed
between the Access Point and a wireless client.
When you’ve completed making any changes on this tab, click the Apply button to save those changes or Cancel to cancel your changes. For more information on this tab, click the Help button.
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Before making any changes to the Advanced Wireless tab, shown in Figure 613, please check your wireless settings on your other systems, because these
changes will alter the effectiveness of the Access Point. In most cases, these
wireless settings do not need to be changed.
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•
Beacon Interval. This value indicates the frequency interval of the beacon.
The default value is 100. Enter a value between 20 and 1000 milliseconds.
The Beacon Interval value indicates the frequency interval of the beacon. A
beacon is a packet broadcast by the Access Point to synchronize the wireless network.
•
RTS Threshold. This value should remain at its default setting of 2346.
Should you encounter inconsistent data flow, only minor reductions are recommended.
•
Fragmentation Threshold. This value specifies the maximum size for a
packet before data is fragmented into multiple packets. It should remain at
its default setting of 2346. A smaller setting means smaller packets, which
will create more packets for each transmission. Only minor reductions of
this value are recommended.
•
DTIM Interval. The default value is 3. This value, between 1 and 255 milliseconds, indicates the interval of the Delivery Traffic Indication Message
(DTIM). A DTIM field is a countdown field informing clients of the next
window for listening to broadcast and multicast messages. When the Access
Point has buffered broadcast or multicast messages for associated clients, it
sends the next DTIM with a DTIM Interval value. Access Point Clients
hear the beacons and awaken to receive the broadcast and multicast messages.
When you’ve completed making any changes on this tab, click the Apply button to save those changes or Cancel to cancel your changes. For more information on this tab, you can click the Help button.
Wireless-G Access Point
The
screen
TheSNMP
SNMP
Taballows you to customize the Simple Network Management
Figure 6-14
Protocol (SNMP) settings. SNMP is a popular network monitoring and management protocol.
The Identification settings let you designate the Contact, Device Name, and
Location information for the Access Point. The SNMP Community settings
allow names to be assigned to any SNMP communities that have been set up in
the network. You can define two different SNMP communities, with the default
names being Public and Private.
•
SNMP. To enable the SNMP support feature, select Enable. Otherwise,
select Disable.
•
Identification. In the Contact field, enter contact information for the
Access Point. In the Device Name field, enter the name of the Access Point.
In the Location field, specify the area or location where the Access Point
resides.
•
SNMP Community. You may change the name from its default, Public.
Enter a new name in the Public field. Then configure the community's
access as either Read-Only or Read-Write.You may change the name from
its default, Private. Enter a new name in the Private field. Then configure
the community's access as either Read-Only or Read-Write.
When you’ve completed making any changes on this tab, click the Apply button to save those changes or Cancel to cancel your changes. For more information on this tab, you can click the Help button.
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Appendix A: Troubleshooting
This chapter provides solutions to problems usually encountered during the
installation and operation of the Access Point. Read the description below to
solve your problems. If you can’t find an answer here, check the Linksys website at www.linksys.com.
Frequently Asked Questions
Can the Access Point act as my DHCP Server?
No. The Access Point is nothing more than a wireless hub, and as such cannot
be configured to handle DHCP capabilities.
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 multiplayer games with other users 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.
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
What is Ad-hoc?
An Ad-hoc wireless LAN is a group of computers, each with a WLAN adapter,
connected as an independent wireless LAN. An Ad-hoc wireless LAN is applicable at a departmental scale for a branch or SOHO operation.
What is Infrastructure?
An integrated wireless and wired LAN is called an Infrastructure configuration. Infrastructure is applicable to enterprise scale for wireless access to a central database, or wireless application for mobile workers.
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Wireless-G 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 as the 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 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
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.
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 ESSID?
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 maintaining a continuous connection to the wireless network stations and 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
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Instant Wireless® Series
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.
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, the WLAN series offers 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.
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Wireless-G Access Point
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 Media Access Control (MAC) 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 purposes, this number is usually permanent. Unlike IP addresses, which can
change every time a computer logs on to the network, the MAC address of a
device stays the same, making it a valuable identifier for the network.
How do I avoid interference?
Using multiple Access Points on the same channel and in close proximity to
one another will generate interference. When employing multiple Access
Points, be sure to operate each one on a different channel (frequency).
How do I reset the Access Point?
Press the Reset button on the back of the Access Point for about ten seconds.
This will reset the unit to its default settings.
How do I resolve issues with signal loss?
There is no way to know the exact range of your wireless network without testing. Every obstacle placed between an Access Point and wireless PC will create signal loss. Leaded glass, metal, concrete floors, water and walls will inhibit the signal and reduce range. Start with your Access Point and your wireless
PC in the same room and move it away in small increments to determine the
maximum range in your environment.
You may also try using different channels, as this may eliminate interference
affecting only one channel. Also, due to FCC regulations, more power may be
transmitted, using 802.11a, on channels 52, 56, 60 and 64, than on the lower
channels. Lastly, check the Advanced tab of the Web-Based Utility and make
sure that FULL is selected in the Transmission Rate field.
Does the Access Point function as a firewall?
No. The Access Point is only a bridge from wired Ethernet to wireless clients.
I have excellent signal strength, but I cannot see my network.
WEP is probably enabled on the Access Point, but not on your wireless adapter
(or vice versa). Verify that the same WEP Keys and levels (64 or 128 ) are
being used on all nodes on your wireless network.
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What is the maximum number of users the Access Point facilitates?
No more than 65, but this depends on the volume of data and may be less if
many users create a large amount of network traffic.
How many channels/frequencies are available with the Access Point?
Using 802.11b or draft 802.11g, there are eleven available channels, ranging
from 1 to 11.
Wireless-G Access Point
Appendix B: Setting Up the TCP/IP and
IPX Protocols
Setting Up TCP/IP in Windows
Before a computer can communicate with the Access Point, it must be configured with the TCP/IP protocol. If you know how to set up TCP/IP on your computers, do so now. Otherwise, use the guidelines below to help get TCP/IP
installed on all of the computers that need to communicate with the Access
Point. If you are unable to successfully install TCP/IP on one or more computers after following the directions, contact the manufacturer of your computers'
network operating system for further assistance. Check with your network
administrator for your TCP/IP settings.
The directions below provide general guidelines for coming up with IP addresses and subnet masks. Check with your network administrator to see if you need
to use specific IP addresses or DHCP settings.
First, each computer on the network will require an IP address, which is a series
of numbers, separated by periods, identifying the PC on the network. To make
things simple, you should use the following numbering scheme:
192.168.1.X
In this example, X is a unique, arbitrarily assigned number from 1 to 254. Each
computer must have its own unique X number. Note: Never use 0, 250 or 255
for X. These numbers are reserved by TCP/IP for other uses.
For example, if you have three computers, you could number them as follows:
192.168.1.17
192.168.1.44
192.168.1.126
In this case, 17, 44, and 126 are arbitrary numbers between 1 and 254.
Each computer will also require a subnet mask, which is a numerical “filter”
that tells a computer what kinds of TCP/IP data packets to accept. If you’re not
sure which mask to use, the following mask is recommended:
255.255.255.0
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Instant Wireless® Series
The following instructions are provided as examples for reference only. For
complete instructions on installing and troubleshooting TCP/IP and IPX, consult your Windows operating system documentation.
TCP/IP Setup for Windows 98 and Millennium
Wireless-G Access Point
TCP/IP Setup for Windows NT 4.0
1. Click the Start button, select Settings, and open the Control Panel. Inside
the Control Panel, double-click the Network icon.
1. Click the Start button, select Settings, and open the Control Panel. Inside
the Control Panel, double-click the Network icon.
2. When the Network window appears, click the Protocols tab. Then, click
the Add button.
2. If the TCP/IP Protocol is listed for your network adapter, go to step five.
Otherwise, click the Add button.
3. Find the TCP/IP protocol in the Select Network Protocol field. Click it
once and then click the OK button.
3. When the Component Type window appears, select Protocol and click the
Add button.
4. When asked if you want to use DHCP, choose No.
4. Select Microsoft in the Manufacturers list and choose TCP/IP in the
Network Protocols list. Then, click the OK button.
5. If asked to supply your Windows NT CD, do so. NT will copy the necessary files to your system. You may have to switch between the Access
Point’s Setup CD and the NT CD.
5. When the Network window reappears, click TCP/IP. Then, click the
Properties button.
6. When TCP/IP appears in the Network Protocols window, click the
Bindings tab. Windows will store your new bindings.
6. Select Specify an IP Address.
7. Click the Protocols tab. Then, select TCP/IP.
7. Enter an IP Address for the computer, along with a Subnet Mask. Click the
OK button. If you do not have these values, consult your network administrator.
8. Click the Properties button. Select the type of network adapter you have
from the Adapters box and select Specify an IP Address.
8. When the Network window reappears, click the OK button. Restart your
machine. TCP/IP has now been successfully installed.
IPX Setup for Windows 98 and Millennium
9. Enter the computer’s IP Address and Subnet Mask. Check with your network administrator for your settings.
10. Enter your Default Gateway if you have one.
Note: a Default Gateway is not required. Check with your network administrator.
1. Click the Start button, select Settings, and open the Control Panel. Inside
the Control Panel, double-click the Network icon.
11. When you finish, click the OK button. If NT asks about WINS, ignore it.
2. If the TCP/IP Protocol is listed for your network adapter, go to step four.
Otherwise, click the Add button.
12. When the Network window reappears, click the Close button. Restart your
computer when prompted. TCP/IP has now been successfully installed.
3. When the Component Type window appears, select Protocol and click the
Add button.
IPX Setup for Windows NT 4.0
1. Click the Start button, select Settings, and open the Control Panel. Inside
the Control Panel, double-click the Network icon.
4. Select Microsoft in the Manufacturers list and choose IPX/SPX protocol
in the Network Protocols list. Then, click the OK button.
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Instant Wireless® Series
Wireless-G Access Point
2. When the Network window appears, click the Protocols tab. Then, click
the Add button.
4. Select NWLink IPX/SPX/NetBIOS Compatible Transport Protocol
from the list and click the OK button.
3. Find the IPX/SPX protocol in the Select Network Protocol field. Click it
once and click the OK button.
5. When the Network window reappears, click the OK button. Restart your
computer. NWLink IPX/SPX/NetBIOS Compatible Transport Protocol has
now been successfully installed.
TCP/IP Setup for Windows 2000
1. At the Windows 2000 desktop, right click My Network Places and select
Properties. Then, right click Local Area Connection. Choose Properties.
TCP/IP Setup for Windows XP
1. Click the Start button and open the Control Panel.
2. If the TCP/IP Protocol is listed for your network adapter, go to step five.
Otherwise, click the Install button.
3. When the Component Type window appears, select Protocol, and click the
Add button.
4. Select Internet Protocol (TCP/IP) from the list and click the OK button.
5. When the Local Area Connection Properties window reappears, select
TCP/IP, and click the Properties button.
2. Double click the Network and Internet Connections icon.
3. Double click the Network Connections icon.
4. Right click the Local Area Connection icon and select Properties.
5. If the TCP/IP Protocol is listed for your network adapter, go to step five.
Otherwise, click the Install button.
6. When the Component Type window appears, select Protocol, and click the
Add button.
6. Select Use the following IP Address.
7. Select Internet Protocol (TCP/IP) from the list and click the OK button.
7. Enter an IP Address for the computer, along with a Subnet Mask and
Default Gateway. Then, click the OK button. If you do not have these values, consult your network administrator.
8. When the Local Area Connection Properties window reappears, select
TCP/IP, and click the Properties button.
8. When the Local Area Connection Properties window reappears, click the
OK button. TCP/IP has now been successfully installed.
9. Select Use the following IP Address.
IPX Setup for Windows 2000
10. Enter an IP Address for the computer, along with a Subnet Mask and
Default Gateway. Then, click the OK button. If you do not have these values, consult your network administrator.
1. At the Windows 2000 desktop, right click My Network Places. Then right
click Local Area Connection. Choose Properties.
2. If the NWLink IPX/SPX/NetBIOS Compatible Transport Protocol is listed
for your network adapter, click the Cancel button. Otherwise, click the
Install button.
11. When the Local Area Connection Properties window reappears, click the
OK button. TCP/IP has now been successfully installed..
3. When the Component Type window appears, select Protocol and click the
Install button.
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Appendix C: Glossary
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.
802.11g - A proposed, but as yet unratified extension of the IEEE 802.11 standard for wireless networking hardware. The draft 802.11g specifications used
by Linksys specify a maximum data transfer rate of 54Mbps using OFDM
modulation, an operating frequency of 2.4GHz, backward compatibility with
IEEE 802.11b devices and WEP encryption for security.
Adapter - Printed circuit board that plugs into a PC to add to capabilities or
connectivity to a PC. In a networked environment, a network interface card is
the typical adapter that allows the PC or server to connect to the intranet and/or
Internet.
Ad-hoc Network - An ad-hoc network is a wireless network or other small network in which some of the network devices are part of the network only for the
duration of a communications session while in some close proximity to the rest
of the network.
Backbone - The part of a network that connects most of the systems and networks together and handles the most data.
Bandwidth - The transmission capacity of a given facility, in terms of how
much data the facility can transmit in a fixed amount of time; expressed in bits
per second (bps).
Beacon Interval - A beacon is a packet broadcast by the Access Point to keep
the network synchronized. A beacon includes the wireless LAN service area,
the AP address, the Broadcast destination addresses, a time stamp, Delivery
Traffic Indicator Maps, and the Traffic Indicator Message (TIM).
Bit - A binary digit. The value - 0 or 1-used in the binary numbering system.
Also, the smallest form of data.
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Wireless-G Access Point
Browser - A browser is an application program that provides a way to look at
and interact with all the information on the World Wide Web or PC. The word
"browser" seems to have originated prior to the Web as a generic term for user
interfaces that let you browse text files online.
BSS (Basic Service Set) - A group of wireless Network PC Card users and an
Access Point.
Buffer - A buffer is a shared or assigned memory area used by hardware
devices or program processes that operate at different speeds or with different
sets of priorities. The buffer allows each device or process to operate without
being held up by the other. In order for a buffer to be effective, the size of the
buffer and the algorithms for moving data into and out of the buffer need to be
considered by the buffer designer. Like a cache, a buffer is a "midpoint holding
place" but exists not so much to accelerate the speed of an activity as to support the coordination of separate activities.
CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) - In local
area networking, this is the CSMA technique that combines slotted time-division multiplexing with carrier sense multiple access/collision detection
(CSMA/CD) to avoid having collisions occur a second time. This works best if
the time allocated is short compared to packet length and if the number of situations is small.
CSMA/CD (Carrier Sense Multiple Access/Collision Detection) - The LAN
access method used in Ethernet. When a device wants to gain access to the network, it checks to see if the network is quiet (senses the carrier). If it is not, it
waits a random amount of time before retrying. If the network is quiet and two
devices access the line at exactly the same time, their signals collide. When the
collision is detected, they both back off and each wait a random amount of time
before retrying.
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.
Database - A database is a collection of data that is organized so that its contents can easily be accessed, managed, and updated.
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
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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.
DHCP supports static addresses for computers containing Web servers that
need a permanent IP address.
Download - To receive a file transmitted over a network. In a communications
session, download means receive, upload means transmit.
Driver - A workstation or server software module that provides an interface
between a device and the upper-layer protocol software running in the computer; it is designed for a specific device, and is installed during the initial installation of a network-compatible client or server operating system.
DSSS (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.
DTIM (Delivery Traffic Indication Message) - A DTIM field is a countdown
field informing clients of the next window for listening to broadcast and multicast messages. When the AP has buffered broadcast or multicast messages for
associated clients, it sends the next DTIM with a DTIM Interval value. AP
Clients hear the beacons and awaken to receive the broadcast and multicast
messages.
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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.
Encryption - A security method that applies a specific algorithm to data in
order to alter the data's appearance and prevent other devices from reading the
information.
ESS - More than one BSS in a network.
Ethernet - IEEE standard network protocol that specifies how data is placed
on and retrieved from a common transmission medium. Has a transfer rate of
10 Mbps. Forms the underlying transport vehicle used by several upper-level
protocols, including TCP/IP and XNS.
FHSS (Frequency Hopping Spread Spectrum) - FHSS continuously changes
the center frequency of a conventional carrier several times per second according to a pseudo-random set of channels, while chirp spread spectrum changes
the carrier frequency. Because a fixed frequency is not used, illegal monitoring
of spread spectrum signals is extremely difficult, if not downright impossible
depending on the particular method.
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.
Fragmentation - Breaking a packet into smaller units when transmitting over
a network medium that cannot support the original size of the packet.
Gateway - A device that interconnects networks with different, incompatible
communications protocols.
Hardware - Hardware is the physical aspect of computers, telecommunications, and other information technology devices. The term arose as a way to distinguish the "box" and the electronic circuitry and components of a computer
from the program you put in it to make it do things. The program came to be
known as the software.
Hub - The device that serves as the central location for attaching wires from
workstations. Can be passive, where there is no amplification of the signals; or
active, where the hubs are used like repeaters to provide an extension of the
cable that connects to a workstation.
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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 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 several large societies in special areas, such as the
IEEE Computer Society.
Infrastructure - An infrastructure network is a wireless network or other small
network in which the wireless network devices are made a part of the network
through the Access Point which connects them to the rest of the network.
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 requestor or the e-mail sender and can respond
by sending another message using the IP address it received.
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.
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Wireless-G Access Point
Multicasting - Sending data to a group of nodes instead of a single destination.
Network - A system that transmits any combination of voice, video and/or data
between users.
Node - A network junction or connection point, typically a computer or work
station.
OFDM - OFDM (Orthogonal Frequency Division Muliplexing) works by
breaking one high-speed data stream into a number of lower-speed data
streams, which are then transmitted in parallel. Each lower speed stream is used
to modulate a subcarrier. Essentially, this creates a multi-carrier transmission
by dividing a wide frequency band or channel into a number of narrower frequency bands or sub-channels.
Packet - A unit of data routed between an origin and a destination in a network.
Passphrase - Used much like a password, a passphrase simplifies the WEP
encryption process by automatically generating the WEP encryption keys for
Linksys products.
PC Card - A credit-card sized removable module that contains memory, I/O,
or a hard disk.
Port - A pathway into and out of the computer or a network device such as a
switch or router. For example, the serial and parallel ports on a personal computer are external sockets for plugging in communications lines, modems and
printers.
RJ-45 (Registered Jack-45) - A connector similar to a telephone connector that
holds up to eight wires, used for connecting Ethernet devices.
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 (Media Access Control) Address - 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.
Roaming - The ability to use a wireless device and be able to move from one
access point's range to another without losing the connection.
Mbps (MegaBits Per Second) - One million bits per second; unit of measurement for data transmission.
RTS (Request To Send) - An RS-232 signal sent from the transmitting station
to the receiving station requesting permission to transmit.
Router - Protocol-dependent device that connects subnetworks together.
Routers are useful in breaking down a very large network into smaller subnetworks; they introduce longer delays and typically have much lower throughput
rates than bridges.
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Wireless-G Access Point
Server - Any computer whose function in a network is to provide user access
to files, printing, communications, and other services.
units of data (called packet) that a message is divided into for efficient routing
through the Internet.
Software - Instructions for the computer. A series of instructions that performs
a particular task is called a "program." The two major categories of software are
"system software" and "application software." System software is made up of
control programs such as the operating system and database management system (DBMS). Application software is any program that processes data for the
user.
TCP/IP (Transmission Control Protocol/Internet Protocol) - The basic communication language or protocol of the Internet. It can also be used as a communications protocol in a private network (either an intranet or an extranet).
When you are set up with direct access to the Internet, your computer is provided with a copy of the TCP/IP program just as every other computer that you
may send messages to or get information from also has a copy of TCP/IP.
A common misconception is that software is data. It is not. Software tells the
hardware how to process the data.
Throughput - The amount of data moved successfully from one place to another in a given time period.
SOHO (Small Office/Home Office) - Market segment of professionals who
work at home or in small offices.
Topology - A network's topology is a logical characterization of how the
devices on the network are connected and the distances between them. The
most common network devices include hubs, switches, routers, and gateways.
Most large networks contain several levels of interconnection, the most important of which include edge connections, backbone connections, and wide-area
connections.
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).
Static IP Address - A permanent IP address that is assigned to a node in an IP
or a TCP/IP network.
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.
Switch - 1. A data switch connects computing devices to host computers,
allowing a large number of devices to share a limited number of ports. 2. A
device for making, breaking, or changing the connections in an electrical circuit.
Upgrade - To replace existing software or firmware with a newer version.
Upload - To transmit a file over a network. In a communications session,
upload means transmit, download means receive.
UTP - Unshielded twisted pair is the most common kind of copper telephone
wiring. Twisted pair is the ordinary copper wire that connects home and many
business computers to the telephone company. To reduce crosstalk or electromagnetic induction between pairs of wires, two insulated copper wires are
twisted around each other. Each signal on twisted pair requires both wires.
Since some telephone sets or desktop locations require multiple connections,
twisted pair is sometimes installed in two or more pairs, all within a single
cable.
WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64bit, 128-bit, or 256-bit shared key algorithm, as described in the IEEE 802.11
standard.
TCP (Transmission Control Protocol) - A method (protocol) used along with
the Internet Protocol (Internet Protocol) to send data in the form of message
units between computers over the Internet. While IP takes care of handling the
actual delivery of the data, TCP takes care of keeping track of the individual
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Instant Wireless® Series
Appendix D: Specifications
Environmental
Standards
Draft 802.11g, 802.11b
Dimensions
7.32" x 6.89" x 1.89"
(186 mm x 175 mm x 48 mm)
11 Channels (USA)
13 Channels (Europe)
14 Channels (Japan)
Unit Weight
18.25 oz. (0.51 kg)
Certifications
FCC Class B
Port
One 10/100, Auto-Crossover (MDI/MDI-X) Port
Operating Temp.
32ºF to 104ºF (0ºC to 40ºC)
Cabling Type
Category 5 or better
Storage Temp.
-4ºF to 158ºF (-20ºC to 70ºC)
Data Rate
Up to 54Mbps (Wireless),
10/100Mbps (Ethernet)
Operating Humidity
10% to 80%, Non-Condensing
Storage Humidity
5% to 90%, Non-Condensing
Channels
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Wireless-G Access Point
LEDs
LAN
WLAN
Power, Diag
Link/Act, Full/Col, 100
Act, Link
Transmit Power
18 dBm
Receive Sensitivity
(typical)
11Mbps: -80 dBm
54Mbps: -65 dBm
Modulation
CCK, DQPSK, DBPSK, OFDM
Network Protocols
TCP/IP, IPX, NetBEUI
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Instant Wireless® Series
Appendix E: Warranty Information
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 LINKSYS’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. LINKSYS DOES NOT OFFER REFUNDS FOR ANY
PRODUCT.
Wireless-G Access Point
Appendix F: Contact Information
For help with the installation or operation of this product, contact Linksys
Technical Support at one of the phone numbers or Internet addresses below.
Sales Information
Technical Support
RMA (Return Merchandise
Authorization) Issues
Fax
Email
Web
FTP Site
800-546-5797 (LINKSYS)
800-326-7114
www.linksys.com (or call 949-271-5461)
949-261-8868
support@linksys.com
http://www.linksys.com
ftp.linksys.com
LINKSYS OFFERS CROSS SHIPMENTS, A FASTER PROCESS FOR PROCESSING AND RECEIVING YOUR REPLACEMENT. LINKSYS 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 LINKSYS FOR MORE DETAILS.
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© Copyright 2002 Linksys, All Rights Reserved.

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