FOT

Fluke DSX - 8000 line sequence diagram test, test what?

by:FOT     2020-07-16
Fluke DSX - 8000 line sequence diagram test, test what? Line sequence diagram test looks as if he is the most basic copper wiring test, therefore seem less important, but in fact is one of the most critical test. Although blue, orange, green and brown lines of color sequence diagram test may help you through the line, but actually has nothing to do with color fundamental test itself. We deeply know the next. Though the line sequence diagram test does not verify the bandwidth performance, can't let us know whether or not a certain transmission facilities to support the specific application of Ethernet, but the test is the first test in the whole process, enables you to know whether the cable is connected, and all four pairs of lines are correctly connected to the corresponding pin on the far side. In order to achieve this goal, the line sequence diagram test will check open circuit, short circuit, reverse connection, cross line to line and crosstalk. If the dc signal cannot reach the other end, the said wire open circuit; If the signal with a wire to the other, the two wire short circuit. If a wire at the other end into a reverse polarity, it is called a reverse connection of ( Also known as positive/negative reverse connection) 。 For example, a pair of line 4 - at one end connected to the pin 5 reverse connect to 5 - and on the other end 4. If a two wire to the line at the other end is connected to the line on the corresponding position, is called the cross line. For example, a pair of line 3 - at one end connected to the pin 6 - while at the other end is connected to the 4 5. The most difficult of line sequence diagram test found is take out stitches points to. When the pin to pin the connectedness between, but in fact wire to be broken up, take out stitches called points to. For example, assume that a certain line 4 - this should be connected to the pin 5, as one of the wire at both ends are connected to the pin 7; And another line 7 - this should be connected to the pin Eight, but one of the wire at both ends are connected to the pin 5. Take out stitches points for the problem is still can through the simple straight flow test. Near end crosstalk test will not be qualified, however, and very obvious. 吗? 吗? What's the color for? 吗? 吗? 4 use color coding to the line - — White and blue/blue, white orange/orange, white, green, green, white, brown/brown - — Can help you to correct termination. It is easy to the color of the wire with the colors of the socket to match. But in practice, line sequence diagram test really don't care about the color of the wire - — If you want to use white brown/brown line 1 - to end received pin 2, 3 - , 4-6 Five or seven - 8, just straight answer. As long as the guarantee, on the other side also received the same pins at one end. Although the line sequence diagram test don't care about the color of the wire, but the important thing is from beginning to end in the same connection method - — Advances some kind of connection method actually has a lot to do with color. Pin/line of allocation methods follow T568A or T568B standard. T568A connection method in the orange line 3 - to end received pin 6 and T568B wiring method to green line 3 - to end received pin 6. Line sequence diagram test is the most common reasons for not qualified technical personnel to follow the different connection methods, one end of the cable in accordance with the standard T568A termination, and the other end in accordance with the standard T568B termination. If you have been looking at us, you will know that this will cause the cross line. 吗? 吗? Fixed problem? 吗? In the diagnosis of line sequence diagram test unqualified failure, the first step is to check the termination. Could easily find wire pressure welding is not correct, connected to the wrong pin, or simply because the contact wire fracture caused by stress. If the contact problem is not obvious, it's likely that in the cable shear fracture phenomenon, or displays a to much shorter than other line to the line. Or, may simply be connector damage. Use the fluke networks MicroScanner2 Cable Verifier can easily find line error sequence diagram.
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