EtherHub-16 Quick Start Guide
5
AUI Port
This hub has two built-in AUI transceivers (i.e., AUI1 and AUI2) on the rear panel for connection
using thick Ethernet cable (10BASE5) or fiber optic Ethernet cable (10BASE-F). To use either
AUI port, set the DIP switches to the correct positions and described on page 2. An AUI port can
be connected to thick Ethernet by running an AUI drop cable from the hub to a 10BASE5
transceiver attached to the trunk line. A thick Ethernet segment can be extended up to 300 meters
(1270 feet) and contain up to 500 nodes. For fiber optic connection, attach a transceiver directly
to the AUI port, and run a point-to-point link up to 2 kilometers (1.24 miles).
Front Panel Indicators
This hub provides LED indicators for monitoring various network conditions. A glance at the
front panel allows you to instantly monitor the status of each station port plus the overall
condition of the hub.
LED
Status
Indication
Jabber
Steady
Packets have exceeded the length threshold for Jabber Lockup Protection on the hub.
Power
Steady
Power is being supplied to the hub.
Collision
Flashing
Two or more devices are transmitting at the same time. This is normal for an Ethernet
network. However, if there are excessive collisions, the network may be overloaded.
Link/Rx
Steady
Port is connected to an active node and receiving a valid Link Integrity pulse.
Flashing
Traffic is being received at this port.
Partition
Steady
Port is partitioned off due to faulty cable or connectors, or excessive packet collisions.
Troubleshooting
Symptom:
Link/RX indicator remains unlit.
Causes:
Workstation’s network adapter, cable or hub port is defective.
Solution:
The most common cause is a defective network adapter or cable connection. Check
the corresponding cable connections, or the workstation’s network adapter for
possible defects. Verify that the correct cable type (straight or crossover) is being
used. (Note that crossover cable is only required if you cascade hubs via standard
MDI-X ports; i.e., Port 16MDI is not used.) Replace the defective cable or adapter.
Symptom:
Partition indicator lights up.
Causes:
Hub has partitioned RJ-45 port due to excessive packet collsions.
Solution:
If port partitioning has occurred, it will be automatically re-enabled when the
problem is corrected or the port receives a valid data packet.
