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AT&T U120 Hardware / Signal Overview
Front Panel Indicators, Switches & Slots
POWER
ONLINE
VPN
USB
WAN1
WAN2
SERIAL
LED SELECT
SL
LTE
SIGNAL
SIM1
SIM2
SIM SELECT
SIM1 SLOT
SIM2 SLOT
Special Cases
SOFTWARE ROLLBACK
SOFTWARE UPGRADE
Indicates power being delivered to the device.
SOLID: Indicates the device has connectivity to the Internet.
FLASHING: Indicates the device has connectivity to the Internet over a backup
connection.
Indicates if the user-controlled VPN tunnel is connected. If no user-controlled
VPN tunnel is defined then indicates that all of the user-view VPN tunnels are
connected.
Indicates when a supported device is connected to the USB port.
Flickers when traffic is passing over the WAN1 interface.
Flickers when traffic is passing over the WAN2 interface.
Turns on when there is Carrier Detect over at least one of the RS232 serial ports.
Recessed switch to change the SIGNAL strength indicators from cellular to WiFi.
SOLID BLUE: indicates the SIGNAL lights will display cellular signal strength.
SOLID GREEN: indicates the SIGNAL lights will display WiFi signal
strength.FLASHING BLUE: indicates transition of SIGNAL lights to cellular signal
strength being displayed.
FLASHING GREEN: indicates transition of SIGNAL lights to WiFi signal strength
being displayed.
Indicates the installed SIM is active and an LTE network is available.
Bank of 5 LEDs indicating signal strength of an active SIM or WAN over WiFi
connection, increasing from left to right.
GREEN: Indicates the SIM1 slot is currently active and SIM found.
RED: Indicates SIM1 slot was chosen but no SIM found.
GREEN: Indicates the SIM2 slot is currently active and SIM found.
RED: Indicates SIM2 slot was chosen but no SIM found.
For dual SIM operation, toggles which SIM is currently active.
The SIM1 slot accepts a size 4FF nano-SIM from AT&T or Verizon.
The SIM2 slot accepts a size 4FF nano-SIM from AT&T or Verizon.
When a software rollback is underway, the POWER light will be on solid while
ONLINE, VPN, USB, WAN1, WAN2, SERIAL cycle in an inward flashing pattern
with the rightmost bank of lights off.
When a software upgrade image is being downloaded, the POWER and ONLINE
lights are on solid while the VPN light flashes.
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