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10BASE-T Ethernet Mini Hubs User’s Guide
Installation 15
DE-809TC
Diagnostic LEDs on front panel of Mini Hubs
♦
Collision.
◊
Blinking:
Packet collision is occurring. Packet collisions
are not an abnormal situation. Collisions occur when two
or more computers transmit packets on the network
simultaneously, and a contention takes place on the
network line. The computers should then back off, then
retry transmission. This trial-and-error process is repeated
until no collision takes place. Note: Excessive collisions
may result when multiple hubs are cascaded through a thin
coaxial segment and many stations are connected on the
network.
◊
Off:
No packet collision.
♦
Link/Rx
(for each UTP port).
◊
ON:
Data link between (1) Mini Hub’s UTP port and (2)
node’s or cascaded hub’s UTP port is successful.
◊
OFF:
(1) No data link or (2) cable disconnected. Check
for bad cable or loose connectors. For cascaded hubs, check
to see if UTP cable contains crossed-over wires. Also check
for a “power good” condition at both ends of the
connection. If you suspect that the hub port is damaged,
contact your authorized dealer for service.
◊
Blinking:
Packet reception is occurring.