D-Link 809TC User Guide - Page 27

BASE-T Ethernet Mini Hubs User's Guide, Diagnostic LEDs on front panel of Mini Hubs, Collision., - de d link

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10BASE-T Ethernet Mini Hubs User's Guide 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. Installation 15

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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.