Powering The Hub - Cabletron Systems SmartSTACK ELH100 Installation And User Manual

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.
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.
22 Installation
Figure 2-5. Connecting the Power Cord
ELH100-12/24TX