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Model DS508/DS516/DS524 Dual Speed Stackable Hub Installation Guide
RJ-45 Connector
Pin Assignment
Normal Assignment
on Ports 1–8,
1–16, or 1–24
Uplink Assignment
on Port 8, 16, or 24
1 Input Receive Data + Output Transmit Data +
2 Input Receive Data - Output Transmit Data -
3 Output Transmit Data + Input Receive Data +
6 Output Transmit Data - Input Receive Data -
4, 5, 7, 8 Not used Not used
Symptom
Cause Solution
Power LED off
No power at hub Check the power cord connections.
In a stack, no
power at hub but
Terminator LED is
on
Check the power cord. In a stack, the
termination circuitry gets power from the
cascade cable. If one hub in the stack has a
faulty power cord or the cord is unplugged, the
Terminator LED remains on and the remaining
hubs in the stack operate normally.
Terminator LED of a
middle hub in a stack is on
Cascade cable not
connected properly
Check for proper connection.
Link LED off or intermittent Port connection
not functioning
Check the crimp on the RJ-45 connectors and
make sure that the plug is properly inserted and
locked into the port at both the hub and device.
Make sure cabling is Category 5 and meets the
requirements for 100 Mbps operation.
Check installation of the network interface cards
and verify that they are 100 Mbps capable. Be
sure that the proper software driver is loaded.
Check link LEDs on the network adapter card
and PC or workstation. Make sure cables and
connectors are correct.
Collision LED on or
blinking
Collisions taking
place on network
segment(s)
Collisions are normal on Ethernet networks.
Excessive collisions can be caused by incorrect
cabling, connectors, or wiring techniques or can
occur when the network is too busy. Ensure that
the far end is set to half-duplex mode and is
operating properly. Check for these problems.
Problems with port 8 on
the Model DS508 hub,
port 16 on the Model
DS516 hub, or port 24 on
the Model DS524 hub
Normal/Uplink
push button in the
wrong position
Check the Normal/Uplink push button on the
front panel.
Troubleshooting Information