3Com 8000, User Manual

Page: 29 / 52

System Configuration 23
Data Transmission
Properties
The Data Transmission Properties screen lets you select radio channel settings and
performance settings.
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Auto Channel Select—To allow the access point to find a channel
automatically, click the Automatically select the best channel radio button.
When this option is enabled, the access point scans the primary channels to
determine the traffic on those channels and chooses the channel with the least
number of packets.
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If you are using a high-gain antenna such as the optional flat-panel
directional antenna (model 3CWE498) in France or Singapore, you must
manually select from channels 10–13. See “Data Transmission Properties”
on page 24 for information on manually selecting radio channel settings.
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The access point will select between channels 1–13. If your network
supports clients that do not acknowledge 13 channels, you will have to
manually select a channel within the reach of those clients. For example, if
you have clients that only support channels 1–11
To select a specific channel, click the Specify the channel check box and choose
a channel from the Channel list.
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Network Traffic Accelerator—To increase performance, click On (Enhanced
performance). If you experience problems when equipment other than 3Com
11 Mbps Wireless LAN equipment is being used, click Off.
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Data Preamble—To increase performance, click Short (Enhanced
performance). When equipment that does not support short preamble is also
being used, click Long.
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Data Rate—These settings configure the data rates used for wireless
transmissions. By default, the access point selects the best data rate for the
current connection.
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If “Automatically set the best data rate” is selected, the Data Rate cannot
be selected manually.
Wireless DHCP Server If your wired network has a DHCP server, it is recommended that you
use it. However, the access point provides a DHCP server so that
operating systems that do not support automatic IP addressing can
communicate with it.
The access point’s default IP address is 169.254.xxx.1, where xxx is the
last two bytes of the access point’s MAC address. When it is acting as a
DHCP server, the access point can assign up to 253 IP addresses to
currently associated wireless clients. The IP addresses range from
169.254.xxx.2 to 169.254.xxx.254.
If the access point detects that another DHCP server is available, all
wireless clients get IP addresses from that DHCP server.
If your wired LAN DHCP server goes down, the access point assigns IP
addresses after the lease periods on the previous IP addresses expire.
To let the access point act as a DHCP server when there is no other
DHCP server available, click Enable and click Save.
To turn off the access point DHCP server capability regardless of
whether or not another DHCP server is available, click Disable and
click Save.
Gateways You can specify up to three additional gateway IP addresses. These
settings are optional. (Only the default gateway is required).
Setting Description