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3.20 Diagnostics
Three functions, including Diagnostics, Loopback Test and Ping Test are contained in this function folder for
device self-diagnostics. Each of them will be described in detail orderly in the following sections.
3.20.1 Diagnostics
Diagnostics function provides a set of basic system diagnosis. It let users know that whether the system is
health or needs to be fixed. The basic system check includes EEPROM test, UART test, DRAM test and Flash
test.
3.20.2 Loopback Test
In the Loopback Test function, there are two different loopback tests. One is Internal Loopback Test and the
other is External Loopback Test. The former test function will not send the test signal outside the switch box.
The test signal only wraps around in the switch box. As to the latter test function, it will send the test signal to
its link partner. If you do not have them connected to active network devices, i.e. the ports are link down, the
switch will report the port numbers failed. If they all are ok, it just shows OK.
Note: Whatever you choose Internal Loopback Test or External Loopback Test, these two functions will
interfere with the normal system working, and all packets in sending and receiving also will stop temporarily.
3.20.3 Ping
Ping Test function is a tool for detecting if the target device is alive or not through ICMP protocol which
abounds with report messages. The switch provides Ping Test function to let you know that if the target device
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