Vicks Network Router EDG-4516+ ユーザーズマニュアル

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Chapter 4  
4.3.2 Self Test Function 
Test  
The purpose of this test is to confirm that the communication from the 
host PC to the EDG device is OK. When the test is selected, an external 
test will be performed to check that the connection signal between each 
port is working properly. For this test, you will need to connect each port 
to a Loopback tester. Refer to the following chart for specifications of this 
Loopback tester. The Loopback test only applies to RS-232 mode. It is 
divided in two parts: Signal test and Communication Parameters test.
1.
Click on the Test button in the Port Mapping utility. A message 
will confirm that the loopback connector have already been con-
nected with the EDG COM port. If ready, click the Start button to 
start the test.
Test Fail (Without Loopback Connector)
Test ok