3 Installation and Settings
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Rx Chain：Select the receivingchain.
Answer timeout：Answer message timeout. This pa rameter affects the longest
telecommunication distance.
Distance formula：meter=(acktimeout(ms)-27)*150.
Figure 56 RF Configuration Modification
AMPDU：A-MPDU polymerizes the MPDU which is packed by 802.11 messa ges, and
the MPDU is data frame which is packed by 802.11. By one-tim e sending several
MPDU, the required amount of PLCP Prea mble and PL CP Header fo r sendi ng each
802.11 message is reduced, thus, the system throughput is enhanced.
Short-GI： Be used to reduce the interference time among OFDM signs. Under
multipath environment, the lat er fron t-end of cha racter maybe arri ve ear lier than
the former one’s back end, whi ch will ca use the interferences among signs. Guard
Period is the blank tim e between two signs, which can provide a longer buffer time
for the delayed signal.
Figure 57 RF Configuration Modification
11G Mode：802.11g mode working at 2.4GHz freq uency band is compatible with
802.11b equipment.
11NGHT20： 802.11n mode at 20MHz c hannel bandwidth, 8 02.11n provides a
higher speed rate than that of 802.11g.
11NGHT40+:802.11n mode at 40MHz channel band width, using the high deviated
channel (+4) as the extended channel.
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