Cabletron-systems SmartSTACK ELH100 User Manual download pdf (Page 40)

22 Installation ELH100-12/24TX

Powering the Hub

To supply power to the hub, connect the power cord to the hub and to a

grounded three-prong wall outlet (Figure 2-5). See Appendix A "Technical

Specifications" on page 91 for more information regarding specific

international power cord requirements.

Figure 2-5. Connecting the Power Cord

The PWR LED lights green (see Figure 1-1). If it does not, check to make

sure that the power cable is plugged in correctly and that the power

source is good.

When power is applied, the hub conducts a series of hardware and

software tests to verify operation. If a terminal or computer is connected

to the console port, the results of the tests are displayed on the screen. If

you want to display the results of the tests after the hub has been turned

on, turn the power to the hub off then back on.

The hub performs two basic types of tests at power-up. During this time,

all the LEDs light in sequence. These tests are:

• Serial port

The serial console port test is the first test. If the hub fails, no further

tests are performed and the console displays no information.

• Memory

Memory tests on the CPU RAM are performed after the serial port

test. No results are displayed on the console.

After these tests are performed, the operational software of the hub is

loaded. A series of more extensive diagnostic tests are then conducted.

The results of the tests are displayed on the terminal. If all tests pass, the

LEDs return to normal operation. When all tests are complete, the system

is functional and the user interface is ready to receive commands at the

console.

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Cabletron-systems SmartSTACK ELH100 User Manual Page 40