Model DS108 Dual Speed Hub Installation Giude
RJ-45 Connector
The RJ-45 connector (shown in the illustration with an RJ-45 plug) is used to connect
workstations, hubs, and switches through unshielded twisted pair cable. The RJ-45 connector
accepts four-pair Category 3 or Category 5 UTP cable.
RJ-45 Connector Pin
Assignment
Normal Assignment
on Ports 1 to 8
Uplink Assignment
on Port 8
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
Link LED off
or intermittent
Port connection
not functioning
Make sure the power cord is properly connected and
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 the 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)
Excessive collisions can be caused by incorrect cabling,
connectors, or wiring techniques or can occur when the
network is too busy. Ensure that the PC at the far end is set to
half-duplex mode and is operating properly.
Problems with
port 8
Normal/Uplink
push button in the
wrong position
Check the Normal/Uplink push button on the front panel.
711EA
1
8
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Troubleshooting Information
Summary of Contents for DS108 - Hub
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