Contemporary Control Systems AI Active Hubs - Manual (Page 31)

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ACTIVITY Each port on the AI has an associated LED
indicator that indicates that ARCNET traffic is being received
on that port. The intensity of the LED will increase somewhat
with traffic. Transmitted data from that port is not indicated by
the ACTIVITY light. Therefore, disconnected cables, open
cables or cables attached to disabled ARCNET controller chips
will not light the ACTIVITY LED.
STATUS With power applied and with no network cables
connected to the AI or if no valid ARCNET activity is present
on any one port on the AI, this indicator will flash at a periodic
rate indicating that the AI is functioning but idle. If ARCNET
activity is present and the internal regeneration of the ARCNET
signal is proper, this indicator will light, telling you that the AI
is receiving ARCNET signals and (faithfully) reproducing these
signals to other ports on the AI. If this indicator does not light
when activity is present on any hub port, as it should, then the
AI is defective.
RECON Reconfigurations of the network routinely occur
as nodes are added to the network and pose no problem to the
network. When they occur, this LED will flash on for one
second to facilitate viewing even though the reconfiguration
process takes a fraction of a second. However, frequent
reconfigurations can degrade performance of the network as
indicated by this LED flashing repeatedly or lighting
continuously. If this is occurring on your AI, you need to isolate
the connected computers to find out which node is causing these
reconfigurations.
The cause of frequent reconfigurations could be a faulty
network interface module, defective cable, duplicate node IDs,
or a high incidence of electrical interference. An occasional
flash of this light is normal as automatic reconfigurations are a
feature of ARCNET. If this is all that is viewed, you can feel
well assured that the network is operating properly.