Switch User Manual

EtherHub-16 Quick Start Guide

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.