Network Engine LEDs designation, normal status, description, and other
conditions
Table 4: Network Engine LEDs designation, normal status, description, and other conditions
LED Normal Descriptions/Other Conditions
POWER (Green) On Steady
On Steady = Unit is getting power from either the battery or 24 VAC
power. Also see the 24 VAC LED. Off Steady = Unit is shut down.
ETHERNET (Green) Flicker
Flicker = Data is transferring on the Ethernet connection. Ethernet
traffic is general traffic (may not be for the network engine).
Off Steady = No Ethernet traffic, probably indicates a dead Ethernet
network or bad Ethernet connection.
10/LINK (Green) On Steady On Steady = Ethernet connection is established at 10 Mbps.
100/1000 LINK
(Green/Yellow)
On Steady
On Steady (Green) = Ethernet connection is established at 100 Mbps.
On Steady (Yellow) = Ethernet connection is established at 1,000
Mbps.
FC A (Green) Flicker
On Steady = Controllers are defined to FC A (FC Bus 1 or N2 Trunk 1)
in the network engine, but none are communicating (network engine
transmitting only).
Flicker = Normal communications; FC A port is transmitting and
receiving data. Flickers are generally in sync with data transmission
but should not be used to indicate specific transmission times.
Off Steady = No field controllers are defined to FC A (FC Bus 1 or N2
Trunk 1) in the network engine.
FC B (Green) Flicker
On Steady = Controllers are defined to FC B (FC Bus 2 or N2 Trunk
2) in the network engine, but none are communicating. (network
engine transmitting only)
Flicker = Normal communications; FC B port is transmitting and
receiving data. Flickers are generally in sync with data transmission
but should not be used to indicate specific transmission times.
Off Steady = No field controllers are defined to FC B (FC Bus 2 or N2
Trunk 2) in the network engine.
PEER COMM (Green)
Varies (see
next column)
Flicker = Data traffic between network engines. For a network
engine that is not a Site Director, this LED indicates regular
heartbeat communications with the Site Director. For a Site Director
network engine, flashes are more frequent and indicate heartbeat
communications from all other network engines on the site. For
a single network engine on a network without an ADS, there is no
flicker.
NAE55/NIE55 Installation Guide14
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