Six types of cabling system Frequently asked questions

What is the bandwidth of Class 6 systems?

In the draft of ISO 11801 and TIA 568, 6 types of cabling systems are set to 250MHz. For cables, connectors, links, and channels, all performance parameters such as Next, psnext, insertion loss, and Pselfext are set to this frequency. The early 6 draft system was set at 200MHz, but due to the requirements of the IT industry, especially the IEEE (Institute of Electrical and Electronics Engineers), it increased by 25%, now 250MHz.

Note: 200MHz is still a critical value. The draft standard for two 6-class systems requires 0dB PSACR only slightly above 200MHz.

2. What is the importance of 0dB PSACR?

It is a key parameter to measure the performance of the whole wiring system. For example, it is like checking the health of a wiring system with a pulse. According to the TIA 568 6 class System specification Draft 6A,PSACR is defined as: "Attenuation/crosstalk ratio (ACR) Power total value: is based on the insertion loss and the difference between psnext, it is a signal to noise ratio, the unit is DB." ”

Simply put, the frequency of the 0dB PSACR is the maximum available bandwidth of the cabling system. Over this frequency, the system will not work. The definition of SNR is that at a certain point the noise level is so close to the signal level that the receiver cannot determine what information it receives and therefore cannot process the signal.

To prove the wiring system of a factory qualified, the frequency of 0dB PSACR should exceed 200MHz. The higher the frequency, the better the system. The Powercat 6 system of the Molex Enterprise Cabling Network, when configured as a 4-connector channel (which is the worst-case scenario defined in industry), continues to occur at a frequency higher than 280MHz 0dB PSACR. (Computer science)

3. What is the status of Class 6 system specifications?

Until July 2000, 6 system specifications were still drafts in both ISO and TIA standards.

(a) TIA568

TIA Cabling System Standards The Committee has developed draft 6a on the 6-class system specification. Prepare it as an appendix to the upcoming TIA 568-b specification, Tia568-b is a new version of the U.S. wiring system specification.

The draft 6 system specification was given to members of the Committee on May 1, 2000. This specification is far from being finalized, with a large number of parameters marked as "TBD (Pending)". This means that there are some performance features to be modified before the specification is finalized and published. The latest version of the draft is a major change from the 5th version (formulated on May 26, 1999), which increases the channel and link requirements from 200MHz to 250MHz. Members of the TIA standards Committee said that the 6-class system specification would be approved for appendix release later in 2001.

(b) ISO 11801

ISO Cabling System Standards Commissioners have tried to keep up with the TIA wiring System Standards Committee's work to ensure synergy between the two standard documents. Class 6 systems are initially defined as Class E links and channels. N598, the latest version of May 8, 2000, modified the previous version (including a definition of insertion loss and insertion loss bias) to conform to the development of the Tia 6 system.

4. Should you specify the Class 6 system you want to use?

This question is generally difficult to answer. "It should be," said briefly. "There is no doubt that the Class 6 system is currently the most high-performance UTP (unshielded twisted pair) cabling system available to us. It works for almost all applications, but in some cases it may not be absolutely necessary.

The main consideration is the cost problem. Class 6 Cabling systems are indeed superior in performance over the 5-class cabling system, but their costs are also increased. For applications that transmit less data than gigabit (Gbps) per second, the Super 5 class system is more appropriate. When data transfers reach gigabit or higher per second, people begin to consider 6 types of systems. There are a number of applications that are being developed, such as Half-duplex Gigabit Ethernet, requiring 6 cabling systems. At present, this half duplex Gigabit Ethernet network interface card (NIC) than the 5-class cabling system of Full-duplex Gigabit Ethernet is 30% lower.

Consider the cost while considering the time. Since the wiring facility supports so many network transitions throughout its lifecycle, long-term costs must be considered. If you or your users have an effective network transition program that includes gigabit or higher Ethernet in the cabling system design lifecycle, you should first consider the 6-class cabling system.

If there is no network transition program, or the program is still relatively vague, the 6-Class cabling system provides excellent security for the prevention of degradation. If you optimize your wiring design from the outset rather than install a low class cabling system, you have a better chance of supporting future network applications. Remember, now the Super 5 class system is the specified wiring system neutral can be the lowest.

However, if the network transformation program is designed for less than gigabit/sec networks, then the 5-Class cabling system is your best choice. It has a strong ability to support all current pervasive network applications, such as 10BaseT and 100BaseT Ethernet, 622Mbps (Gigabit/sec) ATM, and it also facilitates the transition to gigabit-per-second applications required in the future.

5. How should 6 type Cabling system be selected?

It is important to refer to the appropriate industry standard documentation. The 6-class system specification has been proposed for 2.5 of the time, and there have been significant changes during this period. Some manufacturers claim that their cables and/or connectors "conform to Category 6 system specifications", but do not specify which version of the draft is in line. Be aware that some products that conform to the 1998 6 draft system are also in line with Tia 568, draft 2 or draft 3, but may not conform to the current draft specification 6a or final finalized version (which is expected to be released next year).

It is clear that it is not appropriate to say that the system "conforms to the 6-class system specification" because at least one more year will be released than the current version of the improved specification. Many of the changes that are expected will lead to improvements in some products and even price hikes. Therefore, it is too early to ask for a product that conforms to the final 6-class system specification.

If you want to designate a Class 6 system in the present or near future, it must conform to the following documentation:

(a) Tia/eia 568A + PN-3727 Draft 6a (released May 1, 2000) or

(b) ISO/IEC 11801 wg3n598 (released May 8, 2000)

6. Are there any Australian or New Zealand standards for the 6 categories of systems?

No. The latest standard is asnzs3080:1996, which stipulates that 5 types of systems have the highest cabling performance. There are no more high-performance system classes in the ASNZS 3080 specification, as standard committee CT1 is awaiting release of the latest version of the ISO 11801 specification. Following the release of ISO 11801 in March 2000, the CT1 committee has pledged to rewrite the standards and release it at the end of this year, called Asnzs 3,080:2000. It should be noted that this provides a maximum of 5 performance criteria. Until the ISO releases the final Class 6 system standards, the CTI Committee will begin to set standards for the 6-class system, which is expected to be late in 2001.

7. What kind of application is the 6 class system suitable for?

At present, has not been published to require 6 types of cabling system support applications. The 6-Class cabling system has excellent performance and is supported by all applications that are supported by all over 5 or lower categories of cabling systems.

IEEE (Institute of Electrical and Electronics Engineers) is developing a new version of Half-duplex Gigabit Ethernet, which requires a 6-class cabling system. When we write the FAQ, the application is not yet recognized, but it can be obtained from some manufacturers.

According to the report, the cost of these Half-duplex network interface cards (NICs) is about 30% lower than the Full-duplex NIC used in the 5-Class cabling system. Undoubtedly, with the increase of 6 kinds of systems, 6 kinds of system standards become the most common wiring standards, will be issued more and more use of 6 types of cabling system network applications, it can provide a faster data rate, or at the same time the data rate is lower cost.

8. What is the difference between it and the 5-Class cabling system?

In both physical and performance characteristics, 6 types of systems are different from those of super 5 systems.

(a) Physical properties

6-type System products of the twisted 4-wire cable and RJ45 connectors are unchanged. Cabling system architecture and definitions have not changed. And almost everything else has changed. The entire 6-class system, which conforms to the current draft, requires all manufacturers to really redesign their products. The new cable is constructed by building a cross center in the cable and dividing the 4 lines into separate signal areas. This improves the next (near-end crosstalk) performance of the cable and reduces the physical distortion of the cable due to cable connections and bending during installation. Many manufacturers have increased the cross section of the wire, from 24AWG to 23AWG, in an effort to minimize attenuation loss.

Many manufacturers along the line to increase the length of the new twist per meter, cable in the 4-line pairs of the various lines of the difference between the number of pairs of new and improved next performance. In these cases, we should pay attention to determine whether the propagation delay and delay bias are not in turn affected, wiring system These two important parameters are qualified.

There is also a large attenuation on the jumper plugs. All manufacturers are designing special plugs for their 6 type system sockets to provide additional frequency compensation so that paired line pairs are compliant. Some manufacturers separate the wires by inserting plastic into the plugs, while others insert the printed circuit board (PCB) into the plugs.

(b) Transmission performance

In addition to the parameters in the Super 5 system specification, some performance parameters are added to the 6 class system specification. They are insertion loss (substitution attenuation), insertion loss bias, longitudinal conversion loss (LCL), and longitudinal transformation transmission loss (LCTL).

The performance criteria for parameters in Class 6 and Super 5 systems have been increased, generally exceeding the frequency band 3~10db. The 0dB PSACR point of the Super 5 class system is about 130MHz, while the 6 class system is about 202MHz.

9. Conforms to the 6-class system channel specification, which also includes component conformance specifications?

No, for the entire 6-class system, these two standards are done separately. Cables and connectors must conform to the standards in the specification and must be designed and tested by the manufacturer. It is generally assumed that if the components conform to standards, the installation channel made up of these components is also compliant. However, the higher level of performance required by Class 6 systems requires higher channel performance. Installation must be extra careful, and any problems can adversely affect channel performance. One thing is very important, is that 6 wiring system to meet the channel specifications, to use the 3-level tester to the installation of the cable to test to meet the 6 type of link specifications.

10. What are the appropriate channel models for Class 6 systems that conform to the test?

The Molex Enterprise Cabling Network Department tested all UTP (unshielded twisted pair) products on the 100m 4-connector channel model, including sockets for telecommunications workstations, adjacent merge points, and two wiring boards between wiring. The model is not equipped with all the devices, so it does not represent the real worst-case test scenario defined in the wiring standard.

11. What is the same as UL for 6 types of cables and connectors recognized?

UL provides 2 kinds of officially recognized communication wiring system, the equipment can conform to one of them, can also be in accordance with both types.

(a) included in the UL list

If the cable meets the frame propagation specification, it is included in the UL list. Therefore, if the cable is included in the UL list, it also shows that it conforms to the specifications, is safe. This is not limited by the performance category.

(b) UL confirmation