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2.4 GHz(B):
If all your clients are 802.11b, select this one. 
2.4 GHz(N): 
If all your clients are 802.11n, select this one. 
2.4 GHz(B+G):
Either 802.11b or 802.11g wireless devices are in 
your environment. 
2.4 GHz(G):
If all your clients are 802.11g, select this one. 
2.4 GHz(B+G+N):
Either 802.11b, 802.11g, or 802.11n wireless devices 
are in your environment. 
Enable ESSID:
We support 4 multiple SSIDs in this device. Please select how 
many SSIDs you would like to use in your network environment. 
ESSID1~4:
ESSID is the name of your wireless network. It might be a unique 
name to identify this wireless device in the Wireless LAN. It is case 
sensitive and up to 32 printable characters. You might change the 
default ESSID for added security. 
Auto Channel:
Device will search all valid channels, then select a cleanest 
channel and change to this channel if you enable this function. 
Depend on this function is enabled or not, you will see different 
items below 
Auto Channel
. 
Channel:
If Auto Channel is disabled, you should choose a static channel and 
AP will use this channel to communicate with other clients. 
Check Channel Time:
If Auto Channel is enabled, you can choose a period 
from the drop-down menu. AP will change to a clean 
channel periodically.