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14  NTU Optical Network Terminals 
Fig. 5 shows the NTU-RG-1421GC-Wac front panel layout. 
 
Fig. 5 –NTU-RG-1421GC-Wac front panel layout  
Table 7 listed LEDs located on the device front panel. 
Table 7 – Description of the LEDs located on the front panel 
power and activity status indicator  
configuration and hardware status indicator  
Ethernet port activity indicator 
Wi-Fi activity indicator for 2.4 GHz 
Wi-Fi activity indicator for 5 GHz 
FXS port activity indicator  
2.6   LED Indication 
2.6.1   NTU-RG-1421G-Wac, NTU-RG-1431G-Wac 
LED indicators located on the front panel represent the current state of the device. 
Possible states of the LEDs are listed in Table 8. 
Table 8— Light indication of the device 
10/100Mbps connection has been established 
1000Mbps connection has been established 
packet data transmission is in progress 
port is not registered or authorization is not 
completed on SIP server