Asus WL-500g User manual

SpaceLink Home Gateway
WL-500g
User’s Manual
®

2 SpaceLink Home Gateway
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Copyright © 2002 ASUSTeK COMPUTER INC. All Rights Reserved.
Copyright Information
Product Name: SpaceLink Home Gateway (WL-500g)
Manual Revision: 1.00 E1062
Release Date: Aug 2002

SpaceLink Home Gateway 3
ASUSTeK COMPUTER INC. (Asia-Pacific)
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
General Tel: [phone]
General Fax: [phone]
General Email: [email protected]
Technical Support
MB/Others (Tel): [phone] (English)
Notebook (Tel): [phone] (English)
Desktop/Server (Tel): [phone] (English)
Support Fax: [phone]
Support Email: [email protected]
Web Site: www.asus.com.tw
Newsgroup: cscnews.asus.com.tw
ASUS COMPUTER INTERNATIONAL (America)
Address: 6737 Mowry Avenue, Mowry Business Center,
Building 2, Newark, CA 94560, USA
General Fax: [phone]
General Email: [email protected]
Technical Support
Support Fax: [phone]
Web Site: www.asus.com
Support Email: [email protected]
ASUS COMPUTER GmbH (Europe)
Address: Harkortstr. 25, 40880 Ratingen, BRD, Germany
General Fax: [phone]
General Email: [email protected] (for marketing requests only)
Technical Support
Support Hotline: MB/Others: [phone]
Notebook (Tel): [phone]
Support Fax: [phone]
Support (Email): www.asuscom.de/de/support (for online support)
Web Site: www.asuscom.de
Copyright Information

4 SpaceLink Home Gateway
Federal Communications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a class B
digitaldevice,pursuanttoPart15oftheFederalCommunicationsCommission (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
thisequipmentdoescauseharmful 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 or more 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.
WARNING!
You are cautioned that changes or modifications not expressly
approved by the party responsible for compliance could void your
authority to operate the equipment.
Reprinted from the Code of Federal Regulations #47, part 15.193, 1993. Washington
DC: Office of the Federal Register, NationalArchives and RecordsAdministration,
U.S. Government Printing Office.
Canadian Department of Communications
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme
NMB-003 du Canada.
Safety Statements

SpaceLink Home Gateway 5
Safety Information
In order to maintain compliance with the FCC RF exposure guidelines,
this equipment should be installed and operated with minimum distance
20 cm between the radiator and your body. Use only with supplied
antenna. Unauthorized antenna, modification, or attachments could
damage the transmitter and may violate FCC regulations. Any changes of
modifications not expressly approved by the grantee of this device could
void the users authority to operate the equipment.
FCC Radio Frequency Exposure Caution Statement
Installation and use of this Wireless LAN device must be in strict
accordance with the instructions included in the user documentation
provided with the product. Any changes or modifications (including the
antennas) made to this device that are not expressly approved by the
manufacturer may void the user’s authority to operate the equipment. The
manufacturer is not responsible for any radio or television interference
caused by unauthorized modification of this device, or the substitution or
attachment of connecting cables and equipment other than manufacturer
specified. It is the responsibility of the user to correct any interference
caused by such unauthorized modification, substitution or attachment.
Manufacturer and its authorized resellers or distributors will assume no
liability for any damage or violation of government regulations arising
from failing to comply with these guidelines.
RF exposure
The antenna(s) used for this transmitter must not be co-located or
operating in conjunction with any other antenna or transmitter.

6 SpaceLink Home Gateway
Table of Contents
1. Introduction.......................................................................................... 8
The SpaceLink™ Family ....................................................................... 8
System Requirements ........................................................................... 8
The Product Package ....................................................................... 9
FEATURES.......................................................................................... 10
The IEEE 802.11b Specification .......................................................... 11
Direct-Sequence Spread Spectrum..................................................... 12
Wireless Operation .............................................................................. 13
Roaming Between SpaceLink™ Gateways or APs......................... 14
Roaming Guidelines (SpaceLink™ Gateways or APs) ................... 15
SpaceLink™ Home Gateway Topology ............................................... 16
SpaceLink Home Gateway LED Indicators ......................................... 19
2. Installation.......................................................................................... 20
Installation Procedure.......................................................................... 20
Wall Mounting Option .......................................................................... 22
Vertical Standing Option ...................................................................... 23
Connecting to the SpaceLink Home Gateway..................................... 24
Configuring the SpaceLink Home Gateway......................................... 25
Installing the Homegateway Utilities ............................................... 26
3. SpaceLink Home Gateway Utilities .................................................. 27
Connecting to the SpaceLink Web Manager ....................................... 27
Home Gateway Discovery ................................................................... 27
User Name and Password .............................................................. 29
Home Page ..................................................................................... 29
Login Password ................................................................................... 30
Basic Setup ......................................................................................... 30
Status .................................................................................................. 31
Status Details.................................................................................. 32
Basic Setup - Wireless ........................................................................ 33
Supported Clients ........................................................................... 35
Basic Setup - LAN Configuration......................................................... 37
Basic Setup - WAN Configuration ....................................................... 38
Network Backbone.......................................................................... 38
Agent to an ISP............................................................................... 39
Agent to Another Network ............................................................... 42
Automatic IP.................................................................................... 42
Static IP........................................................................................... 43
Firewall ................................................................................................ 44

SpaceLink Home Gateway 7
Table of Contents
Wireless Access Control...................................................................... 45
Advanced WAN Configuration............................................................. 46
Virtual Server....................................................................................... 48
Special Application .............................................................................. 50
Firewall Bypass Zone .......................................................................... 51
PPTP Server........................................................................................ 52
Firmware Upgrade............................................................................... 53
Restoring Factory Default Settings ................................................. 54
Firmware Restoration .......................................................................... 55
Using a Hub .................................................................................... 55
Printer Setup Wizard ........................................................................... 56
Add Printer Wizard.......................................................................... 56
Printer Setup Wizard....................................................................... 58
Verifying Your Printer ...................................................................... 59
VPN Client ........................................................................................... 60
Starting VPN Client ......................................................................... 60
Main Window ....................................................................................... 60
Connection Properties ......................................................................... 62
Connection Name ........................................................................... 62
Dialing Options................................................................................ 62
Advanced Properties....................................................................... 63
Dialing a Connection....................................................................... 63
4. Wireless Performance ....................................................................... 64
Site Topography................................................................................... 64
Site Surveys ........................................................................................ 64
Range .................................................................................................. 65
5. Troubleshooting ................................................................................. 66
Common Problems and Solutions ....................................................... 66
Reset to Defaults ................................................................................. 67
6. Appendix ............................................................................................. 70
Operating frequency range.................................................................. 70
Number of operating channels ............................................................ 70
DSSS PHY frequency channel plan .................................................... 70
SpaceLink Home Gateway Specifications........................................... 71
Glossary .............................................................................................. 72

1. Introduction
Chapter 1 - Introduction
8 SpaceLink Home Gateway
1. Introduction
Thank you for choosing the SpaceLink Home Gateway, a member ofASUS’
SpaceLink wireless infrastructure family. The SpaceLink Home Gateway
complies with the IEEE 802.11b wireless standard to provide wireless
mobile clients with network connectivity at data rates of up to 11 Mbps.
The stand-alone the SpaceLink Home Gateway connects to a small Ethernet
network to provide wireless access for wireless mobile clients.
The SpaceLink™ Family
The SpaceLink Home Gateway is a member of a product family that
provides a complete wireless networking solution.
• The SpaceLinkHomeGateway(WL-500g)creates a wireless network
using the IEEE 802.11b wireless standard and adds a router, hub, and
printer server.
• The SpaceLink Access Point (WL-300) creates a wireless network
using the IEEE 802.11b wireless standard.
• The SpaceLink PC Card (WL-100) is a wireless LAN adapter that
fits into a PCMCIA Type II slot in a Notebook PC.
• The SpaceLink CFCard (WL-110) is a wireless LAN adapter that fits
into a Compact Flash Type II slot in a Portable DigitalAssistant (PDA).
System Requirements
To begin using the SpaceLink Home Gateway , you must have the following
minimum requirements:
• ADSL/Cable Modem and Broadband Internet Account
• An Ethernet (10Base-T or 10/100Base-TX) adapter for wired client
• At least one 802.11b wireless adapter for a wireless mobile client
• TCP/IP and Internet browser installed
• Printer, which supports standard parallel protocol (SPP) (optional)
Note: The SpaceLink Home Gateway only supports 10Base-T on
the WAN port and both 10Base-T and 100Base-TX on the LAN port.

1. Introduction
SpaceLink Home Gateway 9
Chapter 1 - Introduction
The Product Package
Each the SpaceLink Home Gateway comes with:
• One SpaceLink Home Gateway (WL-500g)
• One power adapter (5 Volts DC, 2 Amp)
• One RJ-45 Ethernet cable (straight-through)
• One SpaceLink Home Gateway (WL-500g) Quick Start Guide
• One support CD (Utilities and User’s Manual PDF)

1. Introduction
Chapter 1 - Introduction
10 SpaceLink Home Gateway
FEATURES
The SpaceLink Home Gateway features include:
•Multiple local network ports. Four 10/100Base-T Ethernet ports,
offering either a connection to a hub or switch on the local wired network
or a direct connection to multiple Ethernet-enabled computer.
•Wireless antenna. The integrated Wireless Access Point allows the
SpaceLink Home Gateway to link a broadband Internet connection to
your local network of 802.11b (DSSS) wireless mobile clients.
•Broadband port. The Broadband port connects the SpaceLink Home
Gateway to your cable/DSL modem.
•SharedInternetaccess.All computers on the local network can access
the Internet through the SpaceLink Home Gateway, using only a single
external IP address.
•DHCP server support. DHCP (Dynamic Host Configuration Protocol)
support allows the SpaceLink Home Gateway to automatically provide
IP addresses to computers on your local network.
•PPPoE support. Connect to your DSL provider using PPPoE (PPP
over Ethernet), if your ISP uses this method.
•Easy setup and management. Use your web browser from any
computer on the local network to configure the SpaceLink Home
Gateway.
•Advanced features. The SpaceLink Home Gateway supports many
advanced configuration features including the following: User-defined
virtual servers; special Internet applications; exposed computer;
password protection and access control.
•Firewall protection. The SpaceLink Home Gateway’s use of NAT
(Network Address Translation) provides firewall protection for your
local network. NAT masks the local network’s IP Addresses from the
Internet. Additional protection can be achieved using the advanced
features of the SpaceLink Home Gateway.
•WEP support. Supports 64 bit and 128 bit WEP encryption on the
wireless network.

1. Introduction
SpaceLink Home Gateway 11
Chapter 1 - Introduction
The IEEE 802.11b Specification
In 1997, the Institute of Electrical and Electronics Engineers (IEEE) adopted
the 802.11 standard for wireless devices operating in the 2.4 GHz frequency
band.This standard includes provisions for three radio technologies: direct
sequence spread spectrum, frequency hopping spread spectrum, and
infrared. Devices that comply with the 802.11 standard operate at a data
rate of either 1 or 2 Mbps.
In 1999, the IEEE created the 802.11b standard. 802.11b is essentially
identical to the 802.11 standard except 802.11b provides for data rates of
up to 11 Mbps for direct sequence spread spectrum devices. Under 802.11b,
direct sequence devices can operate at 11 Mbps, 5.5 Mbps, 2 Mbps, or 1
Mbps. This provides interoperability with existing 802.11 direct sequence
devices that operate only at 2 Mbps.
Direct sequence spread spectrum devices spread a radio signal over a range
of frequencies. The IEEE 802.11b specification allocates the 2.4 GHz
frequency band into 14 overlapping operating Channels. Each Channel
corresponds to a different set of frequencies. See theAppendix to determine
the center frequency used by each Channel.
If operating multiple 802.11b Home Gateways in the same vicinity, the
distance between the center frequencies must be at least 25 MHz to avoid
interference. Note that the Channels available to an 802.11b Home Gateway
will vary from country to country. In the United States, the 802.11b standard
allocates 11 operating Channels for direct sequence devices. Channels 1,
6, and 11 are independent and do not overlap with each other. To avoid
interference between 802.11b Home Gateways, It is recommended that you
configure the Home Gateways using only Channels 1, 6, and 11.

1. Introduction
Chapter 1 - Introduction
12 SpaceLink Home Gateway
Direct-Sequence Spread Spectrum
Spread spectrum (broadband) uses a narrowband signal to spread the
transmissionovera segment of theradio frequency band or spectrum.Direct-
sequence is a spread spectrum technique where the transmitted signal is
spread over a particular frequency range. The Space Link Home Gateway
uses Direct-Sequence Spread Spectrum (DSSS) for radio communication.
Direct-sequence systems communicate by continuously transmitting a
redundant pattern of bits called a chipping sequence. Each bit of transmitted
data is mapped into chips by the Home Gateway and rearranged into a
pseudorandom spreading code to form the chipping sequence. The chipping
sequence is combined with a transmitted data stream to produce the Home
Gateway output signal.
Wireless mobile clients receiving a direct-sequence transmission use the
spreading code to map the chips within the chipping sequence back into
bits to recreate the original data transmitted by the Home Gateway.
Intercepting and decoding a direct-sequence transmission requires a
predefinedalgorithmto associate the spreadingcode used by thetransmitting
Home Gateway to the receiving wireless mobile client.
This algorithm is established by IEEE 802.11b specifications. The bit
redundancy within the chipping sequence enables the receiving wireless
mobile client to recreate the original data pattern, even if bits in the chipping
sequence are corrupted by interference. The ratio of chips per bit is called
the spreading ratio. A high spreading ratio increases the resistance of the
signal to interference. A low spreading ratio increases the bandwidth
available to the user. The Home Gateway uses a constant chip rate of
11Mchips/s for all data rates, but uses different modulation schemes to
encode more bits per chip at the higher data rates. The Home Gateway is
capable of an 11 Mbps data transmission rate, but the coverage area is less
than a 1 or 2 Mbps Home Gateway since coverage area decreases as
bandwidth increases.

1. Introduction
SpaceLink Home Gateway 13
Chapter 1 - Introduction
Wireless Operation
The SpaceLink Home Gateway will operate as a MAC layer learning bridge
and forward packets between wireless mobile clients and the Ethernet
network.
A wireless LAN that uses the SpaceLink Home Gateway generally consists
of one or more 802.11b Access Points and one or more wireless mobile
clients that have an 802.11b adapter installed.
The SpaceLink Home Gateway maintains a table of MAC addresses, which
it has learned are located either on the Ethernet network or on the radio
network by monitoring the source address of packets it receives. For
example, if the SpaceLink Home Gateway receives a packet over its radio,
it creates an entry in its table for the node that sent the packet and labels the
entry as a member of the radio network. The SpaceLink Home Gateway
removes an entry from the table after five minutes of inactivity.
When the SpaceLink Home Gateway receives a packet from the Ethernet
network, it compares the packet’s destination address with the node
addresses listed in its table. If the packet’s destination address is not in the
table, the SpaceLink Home Gateway will forward the packet to the wireless
mobile clients. If the packet’s destination address is listed in the table as a
member of the radio network, the SpaceLink Home Gateway will forward
the packet to the wireless mobile clients. If the packet’s destination address
is listed in the table as a member of the Ethernet network, the SpaceLink
Home Gateway will not forward the packet to the wireless mobile clients.
The SpaceLink Home Gateway applies the same principles to determine if
a packet received over its radio should be forwarded to the Ethernet network.
The SpaceLink Home Gateway forwards all broadcast packets to wireless
mobile clients. Given this, the SpaceLink Home Gateway can only support
250 nodes.
The speed available to wireless mobile clients depends on the amount of
information that each client exchanges with the network because the 11
Mbps wireless bandwidth is shared will all wireless nodes.

1. Introduction
Chapter 1 - Introduction
14 SpaceLink Home Gateway
Roaming Between SpaceLink™ Gateways or APs
If there are multiple SpaceLink Home Gateways or Access Points on the
network, then a wireless mobile client may seamlessly roam from one the
SpaceLink Home Gateway or Access Point to another.
Each SpaceLink Home Gateway or Access Point creates its own wireless
cell or coverage area. This is also known as a Basic Service Set (BSS).Any
wireless mobile client can communicate with a particular SpaceLink Home
Gateway or Access Point if it is within the SpaceLink Home Gateway’s or
Access Point’s coverage area.
If the cells of multiple SpaceLink Home Gateways orAccess Points overlap,
then the wireless mobile client may switch from one SpaceLink Home
Gateway or Access Point to another as it travels throughout the facility.
During the hand-off from one SpaceLink Home Gateway or Access Point
to another, the wireless mobile client maintains an uninterrupted connection
to the network. This is known as “roaming.”
Multiple SpaceLink Home Gateways connected to a common Ethernet
network form an Extended Service Set (ESS).All members of an Extended
Service Set are configured with an ID, known as the SSID or ESSID.
Wireless mobile clients must be configured with the same SSID as the
SpaceLink Home Gateways or Access Points on the network; a client can
only roam between the SpaceLink Home Gateways or Access Points that
share the same SSID.

1. Introduction
SpaceLink Home Gateway 15
Chapter 1 - Introduction
Roaming Guidelines (SpaceLink™ Gateways or APs)
• A 802.11b PC Card can only roam between 802.11b SpaceLink Home
Gateways or Access Points.
• All the SpaceLink Home Gateways or Access Points must have the
same SSID.
• All computers with SpaceLink PC card or CF card adapters must have
the same SSID as the Home Gateways or Access Points that they will
roam between.
• If WEP encryption is enabled, then all the SpaceLink Home Gateways
orAccess Points and client adapters must use the same encryption level
and WEP Key(s) to communicate.
• The SpaceLink Home Gateways’ or Access Points’ cells must overlap
toensurethat there are no gapsin coverage and to ensurethatthe roaming
client will always have a connection available.
• The SpaceLink Home Gateways or Access Points that use the same
Channel should be installed as far away from each other as possible to
reduce potential interference.
• It is strongly recommended that you perform a site survey using the
utility provided with the SpaceLink PC card or CF card to determine
the best location for each the SpaceLink Home Gateway orAccess Points
in the facility.

1. Introduction
Chapter 1 - Introduction
16 SpaceLink Home Gateway
Wired Client
Wireless Client
Wireless Client
SpaceLink Home Gateway
Wireless
LAN
SpaceLink™ Home Gateway Topology
There are three major ways to deploy the home gateway in your local
network (I) Network backbone, (II)Agent to ISPand (III)Agent to another
network.
Inthistopology, the home gatewayconnectsyour wired and wireless devices
together to form a local area network (LAN), as shown. To connect a
computer (or other device) to the SpaceLink Home Gateway, you need a
network cable (UTP-Cat5) with one end connected to one of the LAN ports
on the back of the SpaceLink Home Gateway and the other in the 10/100
LAN port on that device. For wireless connections, wireless mobile clients
must comply with the IEEE 802.11b standard.
Network Backbone

1. Introduction
SpaceLink Home Gateway 17
Chapter 1 - Introduction
I
nternet Service Provider
Wired Client
Wireless Client
Wireless Client
SpaceLink Home Gateway
WAN
LAN
ADSL or Cable Modem
Internet
Wireless
In this topology, the home gateway is not only a backbone of your LAN
but also an agent to your Internet Service Provider (ISP). You may use an
ADSL or Cable modem to communicate with your ISP. Connect the LAN
port on the modem with the WAN port at the back of the SpaceLink Home
Gateway using a network cable as shown above.
Note: You also need to make sure that other connections on the
ADSL or Cable modem are correct.
Agent to ISP

1. Introduction
Chapter 1 - Introduction
18 SpaceLink Home Gateway
Network Backbone
Wired Client
Wireless Client
W
ireless Client
SpaceLink Home Gateway
WAN
LAN
Wireless
In this topology, the home gateway is an agent between your LAN and
another network. Use a network cable with one end connected to the WAN
port on the home gateway and the other to the other network as shown
above.
Agent to Another Network

1. Introduction
SpaceLink Home Gateway 19
Chapter 1 - Introduction
SpaceLink Home Gateway LED Indicators
The LEDs on the front of the SpaceLink Home Gateway display the status
of the SpaceLink Home Gateway.
PWR (Power)
Off (1) No power, (2) During boot sequence
On (1) Power ON and system ready
Flashing (1) During boot sequence, (2) Self-test error
AIR (Wireless)
Off (1) No power, (2) No wireless connection
On (1) At least one wireless client is associated
Flashing (1)Wireless traffic through this port is detected, (2) Self-test error
WAN (Wide Area Network)
Off (1) No power, (2) No wired connection
On (1) Link to another network device but no traffic
Flashing (1) Wired traffic through this port is detected, (2) Self-test error
LAN (Local Area Network)
Off (1) No power, (2) No wired connection
On (1) Link to another network device but no traffic
Flashing (1) Wired traffic through this port is detected, (2) Self-test error
LPT (Printer)
Off (1) No power, (2) No printer is connected
On (1) The connected printer is switched on
Flashing (1) Send data to a printer
Note: The SpaceLink Home Gateway only supports 10Base-T on
the WAN port and both 10Base-T and 100Base-TX on the LAN port.
PWR
AIR
WAN
LAN
LPT

Chapter 2 - Installation
2. Installation
20 SpaceLink Home Gateway
2. Installation
This chapter describes the installation procedure for the SpaceLink Home
Gateway and includes a description of the LEDs found on the unit.
Installation Procedure
Follow these steps to install the SpaceLink Home Gateway.
1. Location: Determine the best location for the SpaceLink Home
Gateway. Keep in mind the following considerations:
• The length of the Ethernet cable that connects the Home Gateway
to the network must not exceed 100 meters.
• For standard placement, try to place the Home Gateway on a flat,
sturdy surface as far from the ground as possible, such as on top of
a desk or bookcase, keeping clear of metal obstructions and away
from direct sunlight.
• Try to centrally locate the Home Gateway so that it will provide cov-
erage to all of the wireless mobile devices in the area. Orientating the
antenna vertically should provide the best reception.
• Use only the power supply that came with this unit. Other power
supplies may fit but the voltage and power may not be compatible.
It is the responsibility of the installer and users of the SpaceLink
Home Gateway to guarantee that the antenna is operated at least
20 centimeters from any person. This is necessary to insure that
the product is operated in accordance with the RF Guidelines for
Human Exposure which have been adopted by the Federal Com-
munications Commission.
2. Mounting: Place the Home Gateway in the desired location. Wall
mounting is also possible for the Home Gateway. Refer to the section
entitled “Wall Mounting Option” for details.
3. WANConnection:Attach one end of the provided RJ-45 Ethernet cable
to the SpaceLink Home Gateway’s WAN port and attach the other end
to the RJ-45 Ethernet cable to your ADSL or Cable modem.
The SpaceLink Home Gateway WAN port does not support 100Base-
TX; it only supports 10Base-T. The WAN port may be connected to
devices that supports both 10/100, but not pure 100Base-TX.