What is the new wiring standard for class six?

With the rapid development of computer technology, the demand of fast communication, the requirement of network speed is increasing, as the communication platform of network--the bandwidth of integrated cabling system is also increasing. The integrated wiring system is developed from 5 categories to Super 5, and 6 classes and 7 kinds are gradually accepted by users. After nearly four years, more than 10 times to improve the revision, this June, Ansi/tia/eia 568-b copper twisted-pair Line 6 standard formally promulgated, the opinions of the 6 types of wiring market finally have "saying", the user heart also a "ruler".

6 types of market will develop rapidly

According to statistics, last year, China's integrated wiring market 6 types of cable accounted for about 30%, has not accounted for the main share. The main reasons are as follows: 6 types of wiring standards have not yet been formally issued, fearing that the project can not reach the introduction of the 6 types of cabling standards, the price is more than 5 categories about your 20%~30%, the line of Super 5 class has been able to meet the requirements of information network use. Today, the introduction of the 6-class standard will set off a new upsurge of use. As the integrated wiring is the sustainable development industry, the 6 standards will become a new milestone. It is possible to apply 1000base-t and 1000BASE-TX technology to the desktop system during the life cycle of the cabling system. In order to meet the Gigabit Ethernet, the use of six types of cabling system to support higher bandwidth, the use of 6 types of cable although wiring investment has increased, but can greatly reduce the network equipment such as NIC, switch and other investment. and the 6 cable to increase the transmission bandwidth by more than one times, from 100MHz to 250MHz, and its price with the market in a large number of use quickly fall, as the previous period of 5 categories and 3 types of the first time the difference between the big, late basically consistent.

What is the new standard for Class 6?

Ansi/tia/eia 568-b Copper cable twisted pair 6 standards from the Ansi/tia/eia 568-a standard evolved, belong to the North American Standard series, has been playing a comprehensive wiring products guide work, after more than 10 versions of the final revision, finally in June officially issued. (Computer science)

Structural changes

The new 568-b standard is divided into three parts: 568-B1 General cabling System requirements, 568-B2 balance twisted pair wiring components and 568-B3 fiber cabling components.

568-B1 General Cabling System requirements: In the new standard, including the telecommunications cabling system design principles, installation criteria and field test-related content.

568-B2 balanced twisted pair cabling component: In the new standard, contains the component specification, transmission performance, system model and the measurement program used to verify the telecommunication wiring system related content.

568-B3 Fiber Cabling Components: In the new standard, contains the components of the fiber-optic telecommunications cabling system specification and transmission requirements related to the content.

Key new projects

In addition to the structural changes in the 568-b standard, a number of key new projects have been added.

New term: The term "attenuation" is replaced by "insertion loss", which is used to indicate the amount of signal loss on the link and channel, and the TC is changed to the telecommunication quantity tr.

Media type: In the horizontal cable aspect, 4 pairs of 100ω3 UTP or sctp;4 pairs of 100ω 5 UTP or sctp;4 pairs of 100ω6-class UTP or sctp;2 or multiple 62.5/125μm or 50/125μm multimode fibers. In the trunk cable, for 100ω twisted pair, 3 or higher; 62.5/125μm or 50/125μm multimode fiber; single mode fiber. The 568B standard does not recognize 4-to-4 and 5-type cables. 150 shielded UTP is a recognized type of media, however, it is not recommended to use when installing new devices. Mixed and multi-strand cables are allowed for horizontal wiring, but each cable must meet the appropriate level requirements and meet the special requirements of mixed and multiple cables.

Connector line, device line and jumper: for 24AWG (0.51mm) multi-strand conductors, the rated attenuation rate of the UTP jump wiring and the equipment line is 20%, and the attenuation rate of the SCTP cable with 26AEG (0.4mm) conductor is 50%. Multi-strand cables are recommended for jump-wiring devices because of their greater flexibility.

Distance change: Now, for UTP hop wiring and device lines, the ends of the horizontal permanent link are up to 5m (16 ft) long to reach the total channel distance of 100m (328 ft). For the level two trunk, the distance between the intermediate jumps to the horizontal hop (IC to HC) is reduced to 300 (984 ft). The total distance from the main link to the horizontal hop (MC to HC) is still governed by the 568-A standard. Equipment lines and jump wiring connected to other trunk wiring types in intermediate hops should not exceed 20m (66 ft) to no more than 20m (66 ft).

Installation rules: 4 The bending radius of the SCTP cable under the condition of non stress is 8 times times of the cable diameter. The bending radii of 2 strands or 4 strands of fiber are 25mm (1 inches) under non stress conditions and 50mm (2 inches) during stretching. The cable manufacturer shall determine the bending radius of the fibre main trunk line. If the bending radius information cannot be obtained from the living quotient, the bending radius of the internal cable in the building is 10 times times that of the cable diameter and 15 times times under the stress condition. The pulling force of 2-or 4-core fiber is 222N (501BF). The 5-type twisted pair of twisted-stranded wires should be kept within 13mm (0.5 inches), and the 3-type twisted pair should remain within 75mm (3 inches).

Permanent link replaces basic link

Horizontal cabling Permanent link test connectivity and test metrics require permanent link mode for installation personnel and data telecommunications users to authenticate the performance of the permanent installation cable, in the future will replace the basic link mode. The permanent link channel consists of a 90m horizontal cable and 1 connectors, plus 1 optional transfer/sink connectors, if necessary. The permanent link configuration does not include the field tester socket cords and plugs, as shown in the figure.

In addition to the test wiring diagram, cable link length, characteristic impedance, DC loop resistance, attenuation, near-end crosstalk loss, there are some differences in the test parameters of Super 5 and 6 type twisted-pair wires.

Propagation delay

Propagation delay is the propagation of signal extension time. When the channel and basic link propagation delay is determined, the propagation delay of the connection hardware is no more than 2.5ns in the range of 1MHz to 250MHz. The maximum propagation delay of all types of channel configurations is no more than 555ns under 10MHz. The maximum propagation delay of all types of basic link configurations is no more than 518ns and 250MHz below 100MHz in 498ns.

Delay offset

The delay offset is the scale of the delay difference between the fastest line pair and the slowest line to transmit signal. For the installation of wiring per meter, the delay offset does not exceed 1.25ns. The maximum latency skew for all types of path configurations is not greater than 50ns. The maximum latency offset for all types of link configurations is no more than 45ns.

Drive High Speed applications

As a network of the most basic construction or network keel wiring facilities, in order to ensure the efficient operation of the network and the future high-speed network support, at least to select the Super 5 cable system, and for higher requirements, especially considering long-term investment, we recommend the choice of 6 cabling system. It makes the transmission of high-speed data simple, and users can take advantage of cheaper 1000base-tx devices. Its transmission performance is far higher than the Super 5 standards, applicable to the transmission rate is equal to or higher than 1Gbps applications, opened the door to the future high-speed application development. Class 6 Cabling Not only provides a new network application platform, but also greatly improves the service quality of digital voice and video applications to the desktop. The introduction of the 6 standards has greatly promoted the development of the telecommunications industry.

The Battle of the standards

6 class Standard (ansi/tia/eia-568-b) of the formal promulgation, no doubt let manufacturers, testing and service providers, integrators, users have the heart of the "star", but the 6 standards of the dispute whether the dust settles it? As the 6 standards are North American regional standards, International standard ISO/IEC JTC N655 will not be introduced until October this year, and China's 6 standards when the "release", the corresponding industry standards when the launch, have not yet time to decide. This shows that the North American 6 standards in a sense, can only be let 6 types of wiring have the argument.

So, wait until October international standards, European manufacturers adopt international standards, North American manufacturers adopt North American standards, users should choose from? Generally, international standards are relatively broad as they apply to all regions of the world, but the main indicators for the 6 categories of international and North American standards are the same. According to the wiring expert Mr. Shirong introduced, 6 type wiring system standard development was born in September 1997 Munich, at that time had already set out 6 kind of main frame, its near end crosstalk, the loss and so on main index both sides have been unanimously determined. Most importantly, international standards and North American standards are moving towards integration. Shirong cited several examples: North American manufacturers of the main push unshielded cable, European manufacturers to push shielding cable, and in the introduction of the 6 categories of North American standards, has been the shielding part of the content as relevant data added in. Moreover, North America uses 62.5/125μm multimode fiber, Europe uses 50/125μm multimode fiber, North America 6 standards will all of them included.

Of course, when China's 6 types of national standards promulgated, any manufacturers can only meet China's standards in the Chinese market to sell 6 categories of standards. So, when does the standard of our country launch? Shirong told reporters that because of China's standard-setting mentality is "mature one to do a", so since 1995 set 5 standards has not been new progress. The introduction of the North American 6 standards will undoubtedly promote China's development of 6 categories of standards. However, China's standard-setting is very strict, we need to wait until the October international standards, consider international standards, North American standards and the actual situation in China to make a comprehensive formulation, of course, in the meantime, through the national approval, project, review and so on a number of links, so it will take a year or At that time, users can be in accordance with the unified national standards to select products, the 6-class standard of the dispute is really settled.