Five misunderstandings in the selection of electronic distribution frames (1)

Misunderstanding analysis of electronic distribution frame selection is as follows:

1st misunderstandings, 9-pin jumper is not an international standard.

The 9-pin patch cord technology has been mentioned many times. People who have been in touch with the wiring or network know that the network cable has 4 pairs, the corresponding RJ-45 plug and port is also 8-pin. So there are 9-pin jumpers that do not comply with international standards. But few people know, in fact, the RJ-45 standard is left with 10 needle positions, even if the 9-pin jumper technology occupies 9th needles, The RJ-45 slot also leaves a blank space. That's why the 9-pin jumper plug is completely inserted into any RJ-45 port. Because the 9-pin jumper is compliant with international standards.

2nd misunderstandings. The dual distribution frame is not in line with China's national conditions.

First, let's take a look at what is a single distribution frame and what is a dual distribution frame. A single distribution frame connects the cable from the work area to the horizontal distribution frame, and the Jumper directly jumps from the horizontal distribution frame to the switch port. See figure-1.

Figure-1

In addition to the above horizontal distribution frame, each port of the switch must be connected to another switch distribution frame. See figure 2.

Figure 2

From the above link structure, the dual distribution frame has one more distribution frame than the single distribution frame, so the cost must be high. In foreign countries, network designers tend to jump both ends of jumpers to passive devices for security and stability considerations, so they like to use dual distribution frames. In China, the form of single distribution frames is very popular to save investment.

The electronic distribution frame System Based on Link detection technology requires that the wiring system adopt the form of dual distribution frame. The reason is very simple. the two ends of the jumper must participate in intelligent management. If a single distribution frame is used, only the horizontal port is managed, and the switch on the other side cannot participate in management. The dual distribution frame maps all ports of the switch to the distribution frame of the switch. For details, see figure-3. In this way, the electronic distribution frame system can collect the distribution frame information at both ends of the jumper to participate in Intelligent Management.

Figure-3

From the above structure, we can see that if you want to use the electronic distribution frame of link detection principle, the structure of the double distribution frame is almost inevitable. The cost must be higher than that of a single distribution frame. However, the electronic distribution frame is designed for high-end users, such as data centers and buildings of large enterprises and institutions. Most of these users want to use the electronic distribution frame to improve future management, reduce management costs, reduce downtime, and improve the stability and security of the entire network system, in this way, the original investment cost of electronic distribution frames is recovered. Many of these users are considering the stability and reliability of the cabling system. Even if they are not connected to the electronic distribution frame, they will adopt the dual distribution frame. For example, the design standards of some data centers have already stipulated that the dual distribution frame method must be adopted.

The application of the electronic distribution frame is to achieve intelligent network management in the future. To reduce costs, the intelligent principle is abandoned. In fact, the basic principle used by the electronic distribution frame is deviated, and the result is obviously not worth the candle.