If incorrect packets exist on the port, a fault occurs on the line.
You can check the cable in the following way:
- Check whether the twisted pair meets specifications.
Twisted pairs are classified into several categories such as category 3, category 5, and category 6 by material, insulation, and wrapping density. Only twisted pairs of over category 5, such as category 5 enhanced and category 6, support a transmission rate of 100 Mbit/s or above. It is recommended that the UTP twisted pairs and connectors produced by a qualified vendor be used to ensure that the cable material, insulation, and twisting distance meet requirements.
- Check whether the cable preparation meets specifications.
The cable preparation must meet the following requirements:
- The pin assignment of the cable connector must comply with the EIA/TIA 568B standard. If it does not comply with the EIA/TIA 568B standard, it will cause crosstalk and lower the transmission efficiency and distance. In the case of 100 Mbit/s, use the No.1, 2, 3, and 6 cables. In the case of 1000 Mbit/s, use all the eight cables.
- The connector pins must face upward, and the fastener must face downward. Arrange the cables in the following way from the left to the right: 1. white and orange; 2. orange; 3. white and green; 4. blue; 5. white and blue; 6. green; 7. white and brown; 8. brown.
- The cable sheath can fit into the connector. This helps prevent the core wire from being loose and also avoid crosstalk because of twisted failure due to too long pairs. The cable cannot go too deep into the connector. Otherwise, the cable sheath will disable the core wire to be inserted into the bottom of the connector and disallow the connector pin to be properly connected to the core wire.
- The core wires in the connector must be arranged neatly and have the same length. Ensure that each core wire is properly connected to the pin in the connector. Check from the top of the connector to ensure that the copper wire of each core wire is connected at the end of the connector and the connector pin is firmly inserted in the slot. Use a functioning crimping tool provided by a qualified vendor to prevent the pin from being loosely crimped or broken.
- Each prepared cable can be used only after being tested by a network cable tester.
- Check whether the cable layout meets specifications.
The cable layout must meet the following requirements:
- Ensure that signal cables are not damaged or broken, or do not have any junctions between two ends of the cable.
- The cables are not placed on the heat dissipation section of the cabinet or on the air intake and exhaust vents of the chassis.
- Cables are properly bound and are turned smoothly at the bends.
- In the case of many cables, use components such as the cable ladder and tray to prevent cable straining caused by the weight of cables.
- The power cable, ground cable, and signal cable must be separately placed. The distance between power cables, ground cables, and signal cables outside the cabinet meets design requirements. The distance is suggested to be more than 10 cm.
- The cable length must be less than 100 m. If the cable is transferred through multiple distribution frames, the cable length should be shortened based on the site requirements.
Check whether the cable preparation and layout meet specifications based on the preceding requirements. Then, check whether the fault is rectified.
- If yes, no further action is required.
- If no, contact Huawei engineers for technical support.
