What Is a Twisted Pair?

Twisted pair (TP) is a transmission medium most commonly used in integrated wiring engineering. It is composed of two copper wires with an insulation protection layer. The two insulated copper wires are twisted together at a certain density, and the radio waves radiated by each wire during transmission will be canceled by the radio waves emitted from the other wire, effectively reducing the degree of signal interference.

Twisted pair consists of a pair of

The production method of the most basic straight-through type 5 cable is described below. The production methods of other types of network cables are similar, except that the jumper method is different.

Step 1: Use twisted pair

For twisted pair cables, users are most concerned about several indicators that characterize their performance. These indicators include attenuation, near-end crosstalk, impedance characteristics, distributed capacitance, and DC resistance.

1. Attenuation

Attenuation is a measure of signal loss along the link. The attenuation is related to the length of the cable. As the length increases, the signal attenuation also increases. Attenuation uses "db" as the unit, which indicates the ratio of the signal strength at the source transmitting end to the signal strength at the receiving end. Because attenuation varies with frequency, attenuation should be measured over all frequencies in the application range.

2. Near-end crosstalk

1. Amp

The AMP brand is the most common and the most commonly used one in China. Almost every network cable store is sold. Its biggest feature is good quality and low price. Because of its popularity, it also has the most fakes, and some can almost be faked, and it is difficult to distinguish between genuine and fake.

Anpu's six-type twisted pair system is composed of connectors such as Quantum UTP cable, Quantum modular information socket system, Quantum modular distribution frame system, and Quantum patch cord. Quantum type 6 system provides 200MHz bandwidth. Its UTP cable modular connection consists of traditional 110 system or modular connection hardware without tools. The entire system will easily exceed the performance required by type 6 cabling specified by ISO / IEC. standard.

2. Simon

Siemon products are often seen in integrated wiring systems. Compared to the Anpu brand, they are much higher grade, and the quality and technical characteristics are higher than the grade. Of course, their prices are also much higher, so in It is difficult to see its application in the DIY market. Not only that, it also provides a complete set of complete solutions in the integrated wiring system, including network cable making and wiring tools to be described later.

The frequency bandwidth of Simon SYSTEM 6 exceeds 250MHz. At the same time, all performance parameters within 250MHz can meet and exceed the requirements of the six types of draft standards. Simon can provide all six types of products (connection hardware, cables) and systems (basic Link and channel) test report and third-party certification laboratories (such as DELTA, ETL) test certification.

3 Lucent

Although the brand Lucent is heard more, the twisted pair industry is still rare, especially in small and medium-sized enterprises. But this is not to say that it lacks technical strength. On the contrary, it is often seen in the construction of high-end networks. Backed by Bell Labs, Lucent's end-to-end "Category 6" cabling system SYSTIMAX GigaSPEED Solution developed by Lucent Technologies has revolutionized every element of the cabling system connecting the host and the computer in the network, and has optimized the cabling system End-to-end performance.

The GigaSPEED solution is a product with advanced performance, and its performance can fully meet and exceed the indicators of the six types of draft standards. The GigaSPEED system has 14 world patents. A typical GigaSPEED configuration is a horizontal system UTP copper cable with a vertical backbone and a building group subsystem SYSTIMAX fiber. This solution can provide users with the required network performance, while also providing sufficient bandwidth for future network applications and technology development.

4 Litte

LITE (NORDX / CDT) 's Gigabit Category 6 2400 system uses IBDN PS5 enhanced connection and IBDN 2400 series unshielded cable, which can provide a data transmission rate of 2.4Gbps, and its cable provides a higher bandwidth and margin To ensure a wider range of applications. LITE's new six products IBDN System 4800LX will reach a data transmission rate of 4.8Gbps. It consists of a new IBDN 4800LX cable, PS6 connection hardware and PS6 standard cable, which can provide 300MHz bandwidth performance. Compared with the current six types of proposed draft standards, the IBDN System 4800LX has significantly improved various performance parameters.

5. IBM

IBM's ACS Silver series products conform to the draft ISO / IEC 11801 Type 6 / E standards, the draft EN 50173 Type 6 E standards, and the TIA / EIA 568 Type 6 draft standards. The ACS Silver series has a bandwidth of 200MHz, which can better support Gigabit Ethernet and other networks using 4 pairs of cables.

The IBM ACS Silver Series system is backward compatible with Category 5 or Super Category 5. The Silver Series and Copper Series are suitable for the same type of distribution frame, which is easy to upgrade and protect investment. At the same time, the IBM ACS silver series product is a 100 ohm copper cable system, which can be integrated with the IBM ACS crystal series products to achieve the connection of optical cables between different floors, hubs and buildings. At this time, the crystal series products can be horizontal The performance of the low-speed silver series products on the system provides high-speed connections ^[12] .