Common fault resolution of network cable--application techniques

In the installation of the project, due to the limited conditions, are on-site production of network cable, generally do not use instrumentation, only through the pilot indicator to determine whether the guide, but the indicators can not really reflect the quality of the network cable, the production of some of the soft fault is not found, after a period of time will gradually exposed, The following are some of the problems found in data maintenance over the years.
1, Green Line on the 5th foot or other position.
(White orange, orange, white-green, blue, green, white-blue, white-brown, brown)
(White orange, orange, white-green, blue, white-blue, green, white-brown, brown)
This is a completely wrong approach, that one end, by standard practice, the other end in the production of network cable when the Green Line inserted to other positions, especially the Green Line easily inserted into the position of the foot 5th, found in the maintenance, with this line produced by the cable can also make the indicator light lit, and the network can sometimes ping through, But this kind of network cable in data communication use certain endless trouble.
There are also several abnormal line of the production of network cable, can also light ping, but after a period of time the problem is exposed.
Example: a unit with optical fiber networking, after several debugging are not through, and finally want to change the switch port to try, when the network cable pulled down a look found the problem, the original production staff with only 4 cores to create network cable, and a core into the position of 5 feet.
Example: a unit Gesanchaiwu to interrupt, maintenance staff as long as the network cable plug will be good for a while, conjecture may be Crystal King and slot contact loose, the network cable pulled down a look, the line sequence wrong a fall muddled, one end standard practice, the other end into (white orange, orange, green, blue, white green, white blue, white brown, brown). But according to this kind of line order to make network of net actually is pass!
The probability of such error-taking occurs is very low.
2, the Green Line put to the position of the 4th foot.
(White orange, orange, white-green, green, blue, white-blue, white-brown, brown)
(White orange, orange, white-green, green, blue, white-blue, white-brown, brown)
This is the easiest place for beginners to make mistakes, that is, the white Green Line and the Green Line next to each other, this will cause crosstalk, so that the transmission rate is reduced. And it can not be checked out by the instrument, because its end-to-end connectivity is normal, it will not cause network impassability, but the slow speed of the network is sure, serious will also cause when the time to break. Trouble shooting in the future, so no matter how to make a network cable.
3, only use 4 cores to make network cable.
Theoretically speaking, data transmission only with 4 core is enough, but the actual maintenance found that only 4 cores made of network cable or there are some problems, a long network of problems will be exposed, since the network cable has 8 cores, we in the production why only 4 core?
4. Cable protection Sleeve
The main role of the network cable protection is to prevent the pull of the net cable, but in some of the network card location is more jincu, with this protective sleeve will not be plugged in the end, and some of the protective sleeve is more hard, but make the crystal head of the card buckle not to the end, so that contact is
5, cable quality does not pass
At ordinary times we may not care about the quality of the network cable, generally we commonly used in the network cable is less than 10, so the impact of poor quality network cable is not obvious, but in the LAN cabling if more than 30 meters we should pay attention to the quality of the network cable.
Example: a unit debugging with a notebook in each port test is good, but the user's own desktop computer problems came out, close to the discovery of a packet lost, far from simply impassability, and finally verified that the electrical characteristics of the network cable is not up to the requirements.
6, RJ45 Crystal leader does not pass
The inferior RJ45 Crystal Head is mainly the spring piece does not pass through, often occurs not the compaction situation, at that time is the pass, over a period of time again occurs when time breaks the phenomenon.
RJ45 Crystal in the slot with the equipment in the long run, the gradual loosening of the phenomenon, then if we do not have network cable can be two head swap, due to physical location changes, often can be again to guide.
Another crystal boss on the buckle if the elasticity is not good, in a full network of switches on the switch operation is easy to bring out these network cables, causing a new fault.
7, crimping pliers quality does not pass
From the cost considerations, we are now using most of the domestic wire clamp, the jaw of the alloy is not enough hardness, often occurs in the slot bias, resulting in some of the pressure is not true, the pressure on the RJ45 metal Reed, resulting in network cable and metal reed loose phenomenon.
8. Some other faults
At ordinary times we are in the maintenance of network management software to see the connection between the network cable and the port is normal, but sometimes network management to see the port network cable is connected, in fact, it may be a bad wire electrical characteristics of a virtual connection.
Example: a contact interruption, through the network management view switch port found that the network cable contact is not good, remote call on duty personnel plug, found that the device is still not pass, the port disable/enable (off/Open) operation, connectivity.
The second day of interruption, network management can see the port network cable, taking into account the relevant operations the day before yesterday, and then to the port for disable/enable operation, and then look at the port, found that the network cable became not connected. Normal after changing the network cable.
For these troubleshooting needs to maintain the experience of the maintenance personnel of the accumulation of physical connection in the data communication equipment, the network cable is the least attention, especially for a seemingly light on the screen, but sometimes a small wire can create a big communication failure