Remote Device
– remote device
Remote Port
– the remote device port number.
Inverse
– inverse
Current State
– current state of the event
5.3.27 Cable Tester
Diagnostic Tools → Virtual Cable Tester
TFortis switches support the function of cable integrity check for "copper" Fast
Ethernet ports. This test determines the type of fault (cutoff or short circuit) for each
pair and specifies the distance from the switch to the fault location.
The physical principle of testing relies on the fact that the switch sends a test
electrical impulse over the cable, and on the basis of the delay time and the phase of
the received reflected signal determines the distance to the fault and its type. For that
period of time, the connection and the link on the tested port are intermitted.
If the cable is fault-free and the properly functioning network device is
connected to the other side, it is not possible to measure cable length this way,
because test signal will be terminated by the end device and will not be a reflection.
To start testing, press the button under the relevant port in Diagnostic section.
In this case, after the test, the table will display the test results for pairs 1-2 (white-
orange — orange) and 3-6 (white-green — green).
In addition, the SWU switches are testing pairs 4-5, 7-8.
Possible testing results:
1.
Short – Short circuit between pairs
2.
Open – Break or cable is not connected
3.
Good – there is no fault.
The guaranteed precision of cable length measurements by the tester is ± 2
meters. That is why it is possible that during the test of known good cable, the length
of pairs 1-2 and 3-6 will be different. It may be attributed to the several factors:
heterogeneous properties of copper conductors, different density of twisting of pairs,
individual features of PSW switch.
In order to increase the accuracy of measurements, you can calibrate the cable
tester.
To do so, connect the cable with a length of at least 2 meters (leaving the
second end of the cable disconnected), in the Calibrate section of the WEB interface
for the relevant port enter the length of the connected cable in meters in press Set. In
