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EWS150 Configuration Guide
EWS150 Configuration Guide
6.
In the RTS/CTS Threshold field, enter a value between 256 and 2346. This value determines at what
frame length the RTS-CTS function is triggered. By default, the threshold is set at its highest value
(
2346
). A lower value means that the RTS-CTS function is triggered for smaller frame lengths. A lower
threshold value may be necessary in environments with excessive signal noise, but may result in
some performance degradation.
7.
In the Protection Mode field, choose the desired protection mode from the pull-down list (either
Auto, None or Always). The default for this field is
Auto
.
◗
Auto
—This is the default mode and will enable protection for 802.11g stations if the EWS150 finds
an 802.11b client. In this mode, if the 802.11b client leaves the network the protection mode will
revert to None automatically.
◗
None
—This assumes there are no wireless stations using 802.11b (11 Mbps) technology. If
operating in a mixed 802.11b/g network with minimal 802.11b traffic, choose this option to
ensure the best performance for your 802.11g stations.
◗
Always
—Protects 802.11b traffic from colliding with 802.11g traffic. This mode is not
recommended, especially if only a few wireless stations are operating with 802.11b. Only use this
mode in environments with heavy 802.11b traffic or where there is interference.
8.
In the Protection Rate field, choose the data rate at which the RTS-CTS (Request-to-Send and Clear-
to-Send) packets are sent (either 1 Mbps, 2 Mbps, 5.5 Mbps, or 11 Mbps). The default data rate for
this field is
11 Mbps
.
9.
In the Protection Type field, choose either CTS-only or RTS-CTS. With CTS-only selected, the client is
not required to send an RTS (Request-to-Send) to the AP. As long as the client receives a CTS (Clear-
to-Send) frame from the AP then the client is free to send data. With the RTS-CTS option enabled, the
client is required to send an RTS to the AP and wait for a CTS from the AP before it can send data (this
option creates additional overhead and can cause performance degradation). The default for this field
is
CTS-only
.
10.
In the Short Slot Time field, check the box to enable this feature. 802.11g defines the long slot time as
20 microseconds and a short slot time as 9 microseconds. 802.11b only supports the long slot time of
20 microseconds. In an environment with 802.11g devices only, this option (Short Slot Time) must be
enabled for better performance—giving precedence to 802.11g traffic. The default is to have the short
slot time
enabled
.
11.
In the Short Preamble field, check the box to enable this feature. Short slot preamble improves
network efficiency by reducing the preamble from 128 bits to 56 bits. 802.11g is required to support
both short and long preambles (802.11b support for a short preamble is optional). If this option is
enabled, any 802.11b clients associated with the network must support a short preamble. The default
is to have the short preamble
enabled
.
12.
When finished, click on
Update
to apply your changes then click on
Reboot
to reboot the EWS150.
Only after the unit reboots will these changes take effect.
