Troubleshooting - Black Box Active Star Hub IC207A User Manual

IC207A/8A-Manual 7/12/00

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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CHAPTER 6: Troubleshooting
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