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Page 141 / 182 Scroll up to view Page 136 - 140
Wireless Networking
139
Wireless
Networking
■
Ensure that you have an 802.11b or 802.11g or 802.11n wireless
adapter for each wireless computer, and that it is correctly installed
and configured. Verify that each wireless computer has either
Windows 98 or higher or MAC OS 8.5 or higher.
■
Verify that your wireless computers are configured to work in
Infrastructure mode and not Ad Hoc mode. The Router contains an
access point that is designed to operate in Infrastructure mode. Note
that Ad Hoc mode is not supported by the Router.
■
If you have a wired and a wireless NIC in the same computer, ensure
that the wired NIC is disabled.
■
Check the status of the WLAN LED, it should be lit if wireless is
enabled and will flash when there is wireless activity. If not lit, go to
Wireless Settings
on
page 57
and enable wireless networking.
■
Ensure that the TCP/IP settings for all devices are correct.
■
Ensure that the Wireless Clients are using the same SSID or Service
Area Name as the Router. The SSID is case-sensitive.
■
Ensure that the encryption method and level that you use on your
clients are the same as those configured on the Router. The Router
cannot simultaneously support WPA and WEP encryption.
■
Ensure that you have the wireless computer enabled in the list of
allowed MAC addresses if you are using MAC Address Filtering on the
Router.
■
If you are having difficulty connecting or are operating at a low speed
try changing the antenna positions on the rear of the Router.
For more effective coverage you can try reorientating your antennae.
Place one antenna vertically and one horizontally to improve coverage.
Additionally consider moving the wireless computer closer to the
Router to confirm that the building structure or fittings are not
adversely affecting the connectivity. If this resolves the problem
consider relocating the wireless computer or the Router, or trying a
different channel on the Router.
■
Sources of interference: The 2.4Ghz ISM band is used for 802.11b,
802.11g, and 802.11n. This is generally a licence free band for low
power applications, and you may have other devices at your location
that operate in this frequency band. You should take care to ensure
that there are no devices, like microwave ovens for example, close to
the Router or wireless computers as this could affect receiver
sensitivity and reduce the performance of your network. If you are
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140
C
HAPTER
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unsure try relocating both the wireless computers and the Router to
establish whether this problem exists.
■
Most wireless computer adapters will scan the channels for the
wireless Router. If a wireless computer has not located the Router then
try initiating a search manually if the client software supports this
feature or manually set the channel on your wireless computer to
correspond to the Router channel number. Please refer to your
wireless computer adapter documentation and vendor to do this.
■
Speed of connection: The 802.11b and 802.11g standards will
automatically choose the best speed depending on the quality of your
connection. As the signal quality weakens then the speed falls back to
a lower speed. The speeds supported by 802.11g are 54 Mbps,
48 Mbps, 36 Mbps, 24 Mbps, 18 Mbps, 12 Mbps and 6 Mbps. The
speeds supported by 802.11b are 11 Mbps, 5.5 Mbps, 2 Mbps and
1 Mbps. In general the closer you are to the Router the better the
speed. If you are not achieving the speed you had anticipated then try
moving the antenna on the Router or moving the wireless computer
closer to the Router. In an ideal network the Router should be located
in the centre of the network with wireless computers distributed
around it. Applications are generally available with the computer
wireless card to carry out a site survey. Use this application to find the
optimal siting for your wireless computer. Consult your computer card
documentation and vendor for more details.
Recovering from
Corrupted Software
If the system software has become corrupted, the Router will enter a
“recovery” state; DHCP is enabled, and the LAN IP address is set to
192.168.1.1. Follow the instructions below to upload a new copy of the
system software to a Router unit in this state.
Ensure that one of your computers has a copy of the new software image
file stored on its hard disk or available on CD-ROM.
Check on www.3com.com for the latest version firmware.
1
Remove power from the Router and disconnect the telephone line and all
your computers, except for the one computer with the software image.
2
You will need to reconfigure this computer to obtain an IP address
automatically (see
Obtaining an IP Address Automatically
on
page 27
).
3
Restart the computer, and re-apply power to the Router.
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Page 143 / 182
Power Adapter
141
4
Using the Web browser on the computer, enter the following URL in the
location bar:
.
This will connect you to the Recovery utility in the Router.
5
Follow the on-screen instructions. Enter the path and file name of the
software image file.
6
When the upload has completed, the Router will restart, run the self-test
and, if successful, resume normal operation.
7
Refer to the Installation Guide to reconnect your Router to the telephone
line and the computers in your network. Do not forget to reconfigure the
computer you used for the software upload.
If the Router does not resume normal operation following the upload, it
may be faulty. Contact your supplier for advice.
Power Adapter
Power Status Logo not lit.
This is probably because the Router does not have power. Check the
following:
■
Make sure the power lead from the power adapter is properly
connected and the cord is not damaged.
■
Ensure the power adapter is correctly fitted into the power outlet
socket and that the socket switch is turned on if applicable.
■
Ensure you are using only the 3Com power adapter supplied with the
Router.
If there is still no power, contact 3Com Technical Support for assistance.
Caution:
Only use the power adapter supplied with the Router or a
replacement 3Com power adapter. Do not use any other power adapter.
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For reference, the part number for the power adapter supplied for your
region is:
3Com Number
Region
3C15VHUS
US and Canada
3C15VHUK
UK
3C15VHME
Europe and Middle East
3C15VHAA
Australasia (except Japan and Korea)
3C15VHSA
South Africa
3C15VHRA
Argentina
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Page 145 / 182
Frequently Asked Questions
143
Frequently Asked
Questions
How do I reset the Router to Factory Defaults?
See Forgotten Password and Reset to Factory Defaults on
page 138
.
How many computers on the LAN does the Router support?
Up to a maximum number of 253 total users on the LAN are
supported. Please note that the maximum number of users
supported will be vary depending on the amount of traffic that
each user generates.
How many wireless clients does the Router support?
Up to 32 wireless clients are supported. Please note that the total
practical number of wireless users depends on the network
environment and the amount of bandwidth consumed by each
user.
There are only 4 LAN ports on the Router. How are additional
computers connected?
You can expand the number of connections available on your LAN
by using hubs, switches and wireless access points connected to
the Router. 3Com wireless access points, and hubs and switches
provide a simple, reliable means of expanding your network;
contact your supplier for more information, or visit:
Does the Router support virtual private networks (VPNs)?
The Router supports both VPN passthrough and VPN
initiation/termination. VPN initiation/termination is useful when
you need to establish a secure site-to-site communication or make
your network accessible to remote teleworkers.
VPN passthrough is used when you are connected to 3Com Router
and access the corporate network from your laptop with VPN
client.
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