Black Box RJ-11, RJ-45 manual Troubleshooting, The Active Star Hub’s front-panelPower LED is off

IC207A/8A-Manual 7/12/00 9:31 AM Page 15

CHAPTER 6: Troubleshooting

6. Troubleshooting

If you have problems with your Active Star Hub, follow the suggestions described in this chapter.

1.Collect all information relevant to this application, including:

• Product serial numbers.

• Host type and operating system software level.

• Quantity and type of peripheral devices.

• Interconnecting cable types and distances.

• Equipment environment.

• Interconnection diagram.

2.Set up the application with the Active Star Hub in one room interconnected with UTP jumpers. Verify the application with a host port and a terminal.

3.Search through the common problems and possible causes provided below.

The Active Star Hub’s front-panel Power LED is off.

•Verify that the AC and DC connections are correct.

•Verify that the AC outlet is functioning correctly.

If the problem persists, observe the status of the external power supply’s LED and contact Black Box Technical Support at 724-746-5500.

A device is down or unstable.

•Verify that the host’s device type matches the device.

•Verify that the host workstation controller’s capacity has not been exceeded.

•Verify that the device is properly terminated. A peripheral is terminated when its twinaxial port has two 54.9-ohm resistors located between the “A” phase pin and earth ground and the “B” phase pin and earth ground. Termination is provided via a “Y” or “T” cable assembly or by a terminating balun.

•Verify that there are no polarity reversals in the cable.

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