LG LW1100AP Series User manual

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Wireless LAN Access Point
User’s Guide
LW1100AP Series

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Contents
Chapter 1 Introduction To The Wireless LAN
1.1 What’s the Wireless LAN? …………………………………… 5
1.2 Wireless LAN Standard andStructure…………………………6
Chapter 2 Setup GoldStream Access Point ………………….13
2.1 Before You Begin Installation……………………………… ….13
2.2 Installing The LG LW1100AP Series Access Point
…………………………………….15
Adjust the antennas…………………………………………15
Ethernet Cable Connection…………………………………16
ConnectThePowerPack…………………………………..17
Connect Serial Cable………………………………………..18
OpenTerminalProgram …………………………………….19
Configuration Change……………………………………….21
2.3 Verifying the Operation of the LG Access Point ……….28
Chapter 3 Access Point Management……………………….……..30
3.1 Starting a Configuration Tool………………………………………31
Access Point Connection. ……………………………………32
Access Point Configuration Window..……………………….33
Terminal Window for Diagnosis ……………………………..37
Firmware Upgrade Window ………………..………………..38
Firmware Upgrade Via Internet ……………………………..39
Firmware Upgrade Via Local Disk…………………………..41
Access Point Detail Control………………………………….42
3.2 Setting Bridge Mode……………………………………………..43
Chapter 4 Troubleshooting …………………………………………..45

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Appendix
Appendix A CellPlanning (Radio Range)……………………………..46
Appendix B TechnicalSpecification……………………………………48
Appendix C Channel Allocation……………………………..………….50

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THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT
NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT
ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR
THEIR APPLICATION OF ANY PRODUCTS.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE
INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU
ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR LG REPRESENTATIVE FOR A
COPY.
The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for
a Class Adigital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be
required to correct the interference at their own expense.
The following information is for FCC compliance of Class B devices: The equipment described in this manual generates and may radiate
radio-frequency energy. If it is not installed in accordance with LG’s installation instructions, it may cause interference with radio and
televisionreception. This equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the
specifications in part15 of the FCC rules. These specifications are designed to provide reasonable protection against such interference in a
residentialinstallation. However,there is no guarantee that interference will not occur in a particular installation.
Modifying the equipment without LG’s written authorization may result in the equipment no longer complying with FCC requirements for
Class A or Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be
required to correct anyinterference to radio or television communications at your own expense.
You can determine whether your equipment is causing interference by turning it off. If the interference stops, the LG equipment or one of its
peripheral devices probably caused it. If the equipment causes interference to radio or television reception, try to correct the interference by
using one or more of the following measures:
• Turn the television or radio antenna until the interference stops.
•Movetheequipment toone sideor theother ofthe televisionor radio.
• Movethe equipmentfartheraway fromthe televisionor radio.
• Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the
television or radios are on circuits controlled by different circuit breakers or fuses.)

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Modifications to this product not authorized by LG ElectronicsInc. could void the FCC approval and negate your authority to operate the
product.
FCCRF RadiationExposure Statement
This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This equipment should be
installed and operated with a minimum distance of 20 centimeters between the radiator and your body.
ImportantNote :
LW1100AP Antenna type is unique reverse turn SMA connector,Useonlythesuppliedantenna.
Unauthorized antennas, modifications, or attachments could damage the transmitter and may violate FCC regulations.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE
PROVIDED “AS IS” WITH ALL FAULTS. LG AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT OR ARISING FROM A COURSEOF DEALING, USAGE, OR TRADE PRACTICE.
IN NO EVENT SHALL LG OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL
DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR
INABILITY TO USE THIS MANUAL, EVEN IF LG OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
LG LW1100AP, LG logo are registered trademarks of LG Electronics Inc. or its affiliates in the Korea, U.S. and certain other countries. All
other trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a
partnership relationship between LGand any of its resellers.
The LGAccessPointUser ’s Guide
Copyright© 2001, LGElectronics Inc.
All rights reserved.

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Chapter 1 Introduction To The Wireless LAN
A wireless LAN (WLAN) is a flexible data communication system implemented as an
extension to, or as an alternative for, a wired LAN within a building or campus. Using
electromagnetic waves, WLANs transmit and receive data over the air, minimizing the
need for wired connections. Thus, WLANs combine data connectivity with user mobility,
and, through simplified configuration, enable movable LANs. WLANs have gained strong
popularity in a number of vertical markets, including the health-care, retail,
manufacturing, warehousing, and academic arenas. These industries have profited from
the productivity gains of using hand-held terminals and notebook computers to transmit
real-time information to centralized hosts for processing. Today WLANs are becoming
more widely recognized as a general-purpose connectivity alternative for a broad range
of business customers.
1.1 What’s Wireless LAN?
Wireless LANs use electromagnetic airwaves (radio and infrared) to communicate
information from one point to another without relying on any physical connection. Radio
waves are often referred to as radio carriers because they simply perform the function of
delivering energy to a remote receiver. The data being transmitted is superimposed on
the radio carrier so that it can be accurately extracted at the receiving end. This is
generally referred to as modulation of the carrier by the information being transmitted.
Once data is superimposed (modulated) onto the radio carrier, the radio signal occupies
more than a single frequency, since the frequency or bit rate of the modulating
information adds to the carrier.
Multiple radio carriers can exist in the same space at the same time without interfering
with each other if the radio waves are transmitted on different radio frequencies. To
extract data, a radio receiver tunes in (or selects) one radio frequency while rejecting all
other radio signals on different frequencies.
In a typical WLAN configuration, a transmitter/receiver (transceiver) device, called an
access point, connects to the wired network from a fixed location using standard
Ethernet cable. At a minimum, the access point receives, buffers, and transmits data
between the WLAN and the wired network infrastructure. A single access point can
support a small group of users and can function within a range of less than one hundred
to several hundred feet. The access point (or the antenna attached to the access point)

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is usually mounted high but may be mounted essentially anywhere that is practical as
long as the desired radio coverage is obtained.
End users access the WLAN through wireless LAN adapters, which are implemented as
PC cards in notebook computers, or use PCI adapters in desktop computers. WLAN
adapters provide an interface between the client network operating system (NOS)and
the airwaves (via an antenna). The nature of the wireless connection is transparent to
the NOS.
1.2 Wireless LAN Standard and Structure
¦Wireless LAN Standard –IEEE802.11b
The widespread acceptance of WLANs depends on industry standardization to ensure
product compatibility and reliability among the various manufacturers. The Institute of
Electrical and Electronics Engineers (IEEE) ratified the original 802.11 specifications in
1997 as the standard for wireless LANs. That version of 802.11 provides for 1 Mbps and
2Mbps data rates and a set of fundamental signaling methods and other services. The
most critical issue affecting WLAN demand has been limited throughput. The data rates
supported by the original 802.11 standard are too slow to support most generalbusiness
requirements and have slowed adoption of WLANs. Recognizing the critical need to
support higher data-transmission rates, the IEEE recently ratified the 802.11b standard
(also known as 802.11 High Rate) for transmissions of up to 11 Mbps.
With 802.11b, WLANs will be able to achieve wireless performance and throughput
comparable to wired Ethernet.Outside of the standards bodies, wireless industry leaders
have united to form the Wire-less Ethernet Compatibility Alliance (WECA).
WECA’s mission is to certify cross-vendor interoperability and compatibility of IEEE
802.11b wireless networking products and to promote that standard for the enterprise,
the small business, and the home. Members include WLAN semiconductor
manufacturers, WLAN providers, computer system vendors, and software makers.
¦Wireless LAN Network Equipment
802.11 defines two pieces of equipment, a wireless station, which is usually a PC
equipped with a wireless network interface card (NIC), and an access point (AP), which
acts as a bridge between the wireless and wired networks. An access point usually
consists of a radio, a wired network interface (e.g., 802.3), and bridging software
conforming to the 802.1d bridging standard. The access point acts as the base station

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for the wireless network, aggregating access for multiple wireless stations onto the wired
network. Wireless end stations can be 802.11 PC Card, PCI.
¦Wireless LAN Network Configuration
The 802.11 standard define two modes: infrastructure mode and ad hoc mode(or
independent or peer-to-peer).
lAd Hoc Mode
Ad hoc mode (also called peer-to-peer mode or an Independent Basic
Service Set, or IBSS) is simply a set of 802.11 wireless stations that
communicate directly with one another without using an access pointor any
connection to a wired network. This mode is useful for quickly and easily
setting up a wireless network anywhere that a wireless infrastructure does not
exist or is not required for services, such as a hotel room, convention center,
or airport, or where access to the wired network is barred (such as for
consultants at a client site).
Figure 1. Ad Hoc Mode
lInfrastructure Mode
In infrastructure mode, the wireless network consists of at least one access
point connected to the wired network infrastructure and a set of wireless end
stations. This configuration is called a Basic Service Set (BSS). An Extended
Service Set (ESS) is a set of two or more BSSs forming a single sub-network.
IndependentBasic
Service Set (IBSS)

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Since most corporate WLANs require access to the wired LAN for services
(file servers, printers, Inter-net links) they will operate in infrastructure mode.
Figure 2. Infrastructure Mode
¦Roaming
Wireless communication is limited by how far signals carry for given power output.
WLANs use cells, called microcells, similar to the cellular telephone system to extend
the range of wireless connectivity. At any point in time, a mobile PC equipped with a
WLAN adapter is associated with a single access point and its microcell, or area of
coverage. Individual microcells overlap to allow continuous communication within wired
network. They handle low power signals and “hand off” users as they roam through a
given geographic area.
The 802.11 MAC layer is responsible for how a client associates with an access point.
When an 802.11 client enters the range of one ormore APs, it chooses an access point
to associate with (also called joining a Basic Service Set), based on signal strength and
observed packet error rates. Once accepted by the access point, the client tunes to the
radio channel to which the access point is set. Periodically it surveys all 802.11 channels
DistributionSystem(DS)
Service Set (SS) –Multiple
Access Point (AP)
Ethernet(802.3)

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in order to assess whether a different access point would provide it with better
performance characteristics. If it determines that this is the case, it reassociateswith the
new access point, tuning to the radio channel to which that access point is set.
Reassociation usually occurs because the wireless station has physically moved away
from the original access point, causing the signal to weaken. In other cases,
Reassociation occurs due to a change in radio characteristics in the building, or due
simply to high network traffic on the original access point. In the latter case this function
is known as “load balancing,” since its primary function is to distribute the total WLAN
load most efficiently across the available wireless infrastructure. This process of
dynamically associating and reassociating with APs allows network managers to set up
WLANs with very broad coverage by creating a series of overlapping 802.11b cells
throughout a building or across a campus. To be successful, the IT manager ideally will
employ “channel reuse,” taking care to set up each access point on an 802.11 DSSS
channel that does not overlap with a channel used by a neighboring access point.
Figure 3. Roaming
Backbone Network
Access Point (AP)
Inter-Cell Roaming

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¦BSS, ESS and SS ID
The basic service set (BSS) is the basic building block of WLAN network. Minimum
WLAN BSS may be consist of only two stations. Using access point (AP) and network
distribution systems (DS), WLAN service set can be extended arbitrary size –extended
service set (ESS). Each service set has its network ID (SSID). All the service sets within
an ESS network can have same service ID so that the ESS can support inter-cell
ROAMING.

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Figure 4. SSID and Roaming
Backbone Network
AP #`2 SS ID
= LG
ROAMING
AP #`1 SS ID
= LG
AP #`3 SSID
=LWAP
ESS
BSS
Backbone Network
Re-Configuration
Required

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Chapter 2 Setup LG Access Point
2.1 Before You Begin Installation
The LG LW1100AP Series Access Point is a wireless LAN transceiver that can act as
the center point of a stand-alone wireless LAN network or as the connection point
between wireless and wired networks. In multiple installations, the roaming functionality
provided by multiple Access Points allows wireless users to move freely throughout the
facility while maintaining seamless, uninterrupted access to the network. The Access
Point supports Access Point management software. The system settings are contained
on the Access Point's firmware.
Before setting up your Access Point, ask your network system administrator for the
following information:
—If your network does not use a DHCP server, you need an IP (Internet Protocol)
address for the Access Point. If your network uses a DHCP server, an IP address will
be assigned automatically. Each station or device on your network must have a
unique IP address.
—If there is some Access Points are already installed, SSID and channel allocation
strategy.
—WEP key allocation
Caution
You should configure the Access Point before mounting it on a pole or a ceiling. Some
configuration steps, such as communicating with the Access Point through a serial cable,
may be difficult if the Access Point is inaccessible.
Before you begin installation, make sure that you have the following items:
—The LG LW1100AP Series Access Point

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—The Access Point power supply
—The LG LW1100AP Series Installation CD
If any of these items are missing from the package, contact your Access Point supplier.
You will also need:
—A computer that is connected to the same network as the Access Point
—A 9-pin, straight-through, male-to-female serial cable

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2.2 Installing The LG LW1100AP Series Access Point
Follow the instructions below to install the Access Point.
For maximum range, make sure the antennas on your Access Point straight up or
straight down, no matter where your Access Point is mounted.
If you keep your Access Point on a table or a desk, turn the antennas so they point
straight up. If you mount your Access Point on a wall or a pole, turn the antennas so they
are vertical, even though the Access Point is on its side. If you mount your Access Point
on the ceiling, turn the antennas so they point straight down.
Antenna configurations can be varied depending on the Access Point model, cell
coverage or cell plan.
STEP 1 Adjust the antennas

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Connect the Ethernet cable from your wired LAN to your Access Point.
Make sure the unit is not powered up when you connect your network cable.
STEP 2 Ethernet Cable Connection

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Plug the Power Pack into a wall outlet or a power strip, and plug the connector into the
power receptacle on the back of the Access Point.
All three indicators on top of the access point will be bright green.
During normal operation, the indicators willbe bright green. If the indicators does not
display a solid coloror blink, see the “Top Panel IndicatorDescriptions” inthis manual.
Caution
If you have already installed LG LW1100 series client card, you can easily configure
Access Point through air connection between your computer and Access Point. You may
skip next step and go to Access Point Management section.
STEP 3 Connect The Power Pack

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If you have a DHCP server, the server automatically assigns an IP address to the
Access Point when you connect it to your network. To use the Access Point’s
management system, you need to find out the assigned IP address.
If you have access to the DHCP server, you can look on the server to find the IP address
assigned to the Access Point.
If you cannot access the DHCP server, use a 9-pin, straight-through, male -to -female
serial cable to connect the COM 1 or 2 port on your computer to the RS-232 on the back
of the access point. After you find the assigned IP address, you can remove this cable.
You might need the cable again if you need to update the Access Point’s configuration in
the future.
STEP 4 Connect Serial Cable
STEP 5 Open Terminal Program

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Open the HyperTerminal program on the workstation attached to the Access Point.
These instructions describe HyperTerminalfor example,butyou canuseany terminal-
emulation program to communicate with the Access Point. This window appears:
Type a name for the connection and click OK.The Connect To window appears:
Choose the port on your computer to which the serial cable is connected. ClickOK.
The port settings window appears:

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Set Bits per second (baud rate) to 19200, Data bits to8, Parity toNone, Stop bits to1,
and Flow control to None. Click OK.
The Setup screen appears in the HyperTerminal window. If the text does not appear
immediately, press Enter.
If the Access Point has no problem, you can find prompton the terminal program’s
display box:
Typedisconfig and pressEnterto see current default settings of Access Point.Make a
note of the SSID, Channel number and IP address. LG Access Point has a default IP;
100.100.100.100