BW2251 User Guide v1.0
Nov. 2013
Page 44 of 187
Fragment Threshold
– It specifies the maximum size for a packet before data is fragmented into
multiple packets. If you experience a high packet error rate, you may slightly increase the
fragmentation threshold. Setting the fragmentation threshold too low may result in poor network
performance. Only minor modifications of this value are recommended. The default value is
2347.[recommend]
Beacon Interval
– the Beacon Interval value indicates the frequency interval of the beacon. A beacon
is a packet broadcast by the AP to synchronize the wireless network.
DCA
– Enable or Disable DCA service. DCA can help to choose the best working channel
automatically. And static channel selection will be forbidden if DCA is enabled.
DCA(Dynamic Channel Allocation) solution automatically select the optimal operational frequency
channel when power up and periodically monitors the environment and adjusts for the best
operational frequency channel.
DCA threshold
– specify the value (in minutes) of DCA threshold. This threshold is been used to
judge if there is no wireless users connected during this time. And if yes, BW2251 will monitor the
environment and adjust channel for the best operational one.
If wireless network environment is stable which means auto channel selection
needn’t do frequently, set a big value for DCA threshold to gain a stable wireless
users’ connection.
If wireless network environment changes continually, frequent auto channel
selection is needed. So set a relative small value for DCA threshold to let channel
change based on wireless environment.
Wireless users’ will be kicked off when DCA is processing (new operational
frequency channel takes effect).
DCA optional channel
– specify the channels only in which auto channel selection (DCA) will choose
for reducing interference reference.
Only when DCA is enabled,
DCA threshold
and
DCA optional channel
will be
shown.
Preamble
– if your wireless device supports the short preamble and you are having trouble getting it
to communicate with other 802.11b devices, make sure that it is set to use the long preamble.
Auto:
using long preamble when there are clients not supporting short preamble connected ,
otherwise using short preamble. The default is Auto.[recommend]
Short:
always using short preamble.
Long:
always using long preamble.
Slot Time
– specify the slot time policy when working in 2.4GHz band.
Auto:
using long slot time when there are clients not supporting short slot time connected in,
otherwise using short slot time. The default is Auto.[recommend]
Short:
always using short slot time.
Long:
always using long slot time.
To Maximize the compatibility with some 11b clients, set both
Preamble
and
Slot
Time
to long.
