1. Q: Regarding the problem of network cable construction over long distances, in the case of the unit, the office building is too wide, and the internet access point is on the far left side of the building, so that every floor has internet access. It must be fast, how should it be solved?
A: Balanced twisted pair support for data applications is 100 meters, which is defined by international standards. Transmission of network signals over a distance of more than 100 meters will depend on the performance margin of the cabling system, the performance margin of the network equipment, the construction conditions of the site, and other uncertain factors, without obtaining a quantitative indicator, nor can it be obtained. Guarantee. For the case you mentioned, the standard-compliant approach is to set up two telecom rooms on one floor, and the horizontal cable division area is connected to the corresponding telecommunication room to ensure that the horizontal link (from the distribution frame to the information outlet) is not More than 90 meters.
Of course, you can also use a high-performance, high-quality cable and module for direct point-to-point connections (more than 100 meters), but the support for network applications is not guaranteed, which means it may be supported. xDSL or 10ba se-T signals, but may not support higher rates.
The wiring design standard is to be followed. If it is too long, you can consider adding a relay in the middle, such as connecting two network cables with one switch or hub. Don't take risks too long, which can lead to uncertainty in network communication.
2. Q: Our company has a network port that is separated from the floor switch. After testing the switch, the network port, and the line that is separated from the floor switch, the computer has no problem, but the problem is that it can only be sent out. Going to the package and changing a few computers is useless. Do you have any damage to the connection between the main switch and the floor switch when threading?
A: It seems that there may be a problem with the line, provided that the switch port and this computer port can send and receive data packets on other lines. It is recommended that you use the wiring tester to test the channel transmission performance of the line, including the jumpers at both ends, the connectors at both ends (distribution frame and information socket) and the laid cables. The test standard selects 5E or 6 according to the actual situation. class. Also make sure that the jumper used meets the line order standard of T568A/B.
3. Q: What are the special requirements for FiberChannel wiring in the data center computer room?
A: The optical cable channel in the data center computer room is mainly used for 10G network. Pay attention to the following points when selecting:
Transmission distance: OM3 multimode fiber is 300m-550m, single mode fiber is 10-40km
Connection devices and adapters using fiber optics are selected for SC, LC or port type according to network equipment
If an open cable tray is used, the cable must reach the corresponding fire rating (Class A or Class B machine room).
The location of the optical distribution module (such as the top of the equipment cabinet, the open bridge, the wiring header cabinet, and various wiring cabinets)
4. Q: Our company has a total of 3 floors, each with 80-100 computers, and the computer area of ​​each floor is more than 300 square meters. In a case like this, what can I do to complete the cable layout more simply and effectively. The current vague intention is to place a Layer 3 switch in the central area of ​​each layer, and then connect the three switches through the PC server to achieve network sharing, and then access the Internet through the router. Don't know if this works?
A: From the switching network architecture, an aggregation switch should be set up on the basis of the Layer 3 switch. The aggregation switch accesses the server as the data resource sharing platform of the network user, and then the aggregation switch accesses the Internet through the compatible router. point:
The wiring network architecture is adapted to the architecture of the computer network;
The layout of the floor wiring closet should pay attention to the horizontal cable not exceeding 90m in length;
The level of the cabling system conforms to the transmission bandwidth of the Ethernet switch. It is recommended to use a Category 5 or Category 6 cabling system. The trunk uses multimode fiber (OM3) and is equipped with corresponding wiring modules.
More detailed wiring system architecture diagrams should be designed and the interoperability with network facilities should be clearly stated.
5. Q: After the network cabling is done, how to accept it? What aspects do you need to consider?
A: The specific inspection methods, refer to GB50312-2007 "cabling system for engineering acceptance" acceptance note the following:
All information points are 100% permanent link test, and the connection model is required by the specification;
The test index items are determined according to the network supported by the cabling system (such as 100 Mbps, Gigabit, 10 Gigabit, Ethernet network). For details, see the specification index parameter table;
Determine the function and accuracy of the test instrument;
The test results should be printed to save;
The criteria (qualified or unqualified) for judging the quality of the project.
The specification has a more detailed description, and if there are still problems, it can be raised.
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