Fortress Bridge: Monitoring and Diagnostics
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Both upper and lower LEDs can exhibit:

off - The associated radio is disabled (in the Bridge GUI or
CLI).

All four Radio LEDs can exhibit:

solid amber - A firmware error has occurred.
off - Both radios are disabled (in the Bridge GUI or CLI).
5.6.3 Port LEDs
The Fortress Bridge’s Ethernet ports—including those for the
LAN switch, numbered 1 through 8, and for the WAN port—are
each equipped with two LEDs.
The Lnk/Act (link/activity) LEDs are located in the upper left
corner of each LAN switch port and to the left of the WAN
port. They indicate when a link has been established for the
port (solid green) and show data activity on the link
(irregular flashing green).
The POE LED in the upper right corner of each LAN switch
port does not apply to version 2.6.x of the Fortress Bridge
firmware. It is reserved for future support for Bridge Power
over Ethernet (PoE) power sourcing equipment (PSE)
functionality.
The Pwr LED to the left of the WAN port illuminates
whenever the Bridge is powered up—whether the source of
power is PoE PSE or the +48V DC power inlet.