SNR-R7204
Router Hardware Installation Manual
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Chapter 4 Hardware Fault Analysis
The part describes how to remove the fault from the router.
4.1 Fault Separation
The key for resolving the systematic faults is to separate the fault from the system. You
can compare what the system is doing with what the system should do to detect the
fault.
You need to check the following subsystems:
Power source—power source, cable and fan
Port, cable and connection—ports on the front template of the router and the
cables connecting these ports
4.1.1 Power-Related Trouble
Do the following checkups to help remove the fault:
The power on-off is located at “ON”.
If the router is too hot, check whether the air outlet and air inlet are clean and then
do relative operations in section “Requirements for Common Locations”.
The
working temperature of the router is from 0 to 40 Celsius degrees.
If the router cannot be started, check whether the LED indicator is on.
4.1.2 Faults Relative with Port, Cable and Connection
Do the following checkups to help remove the fault:
1)
Check the cable if the router cannot find the port.
2)
If the power on-off is at the “ON” location, check the power source and the
power cable.
4.1.3 Abnormal Troubles of the System
Do the following checkups to help remove the fault:
Check whether the PWR indicator is on.
If the console port does not work after the system is started up, check whether
the console port is set to a baud rate of 9600 bps, eight data bits, no sum check
bit, one stop bit and no traffic control.
4.2 Indicator Description
The LED indicator shows that the router is running.
The following table shows the
indicators of 7204 router and their description:
No.
Abbrev.
Description
1
LINK
It is on when the Ethernet port is connected
normally. It is off when the Ethernet port is
disconnected.