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Chapter 4 Hardware Troubleshooting

The key to troubleshooting is to separate trouble from the system. By analyzing what

system should do and what system is doing, troubleshooting becomes easy. Think of

the following systems while analyzing troubles:



Power and cooling system—Power and cooling fan;



Ports, cables and connections—ports on the front panel of the switch and cables

connected to the ports.

4.1.1

Examine the following conditions to separate troubles:



The power is "ON". Make sure the cooling fan is working normally. If cooling fan

is not working normally, check the fan;



Examine the environment. The switch cannot be overheated. Make sure the

inhale and exhale hole of the switch is clean. Refer to "General Requirement for

Working Environment". The temperature of the switch working environment is

0-40℃ (32-104



If switch is not working and "PWR" indicator is not light, check the power supply.

4.1.2

To separate problems, check the follow status:



If switch port is unable to link, check the connection. Make sure the connection

is normal;



If the power is "ON", check the power supply and power cord;



If the system is working but the console port is not, make sure the console port

configurations are as follows: 115200 baud rate, 8-bit data bit, no parity bit, 1

stop bit and no flow control.

DG-IS4508HP/IS4512HP/IS4514HP Hardware Installation Guide