Lenovo 20074CU User Manual page 62

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ThinkVantage Access Connections 4.1: User's Guide
Icons for status of wireless LAN
v Power to the wireless radio is off.
v Power to the wireless radio is on. The signal strength of the wireless
connection is excellent.
v Power to the wireless radio is on. The signal strength of the wireless
connection is marginal.
v Power to the wireless radio is on. The signal strength of the wireless
connection is poor. To improve signal strength, move your system closer
to the wireless access point.
Icons for status of wireless WAN
v Power to the WAN radio is off.
v No association
v No signal
v Signal level 1
v Signal level 2
v Signal level 3