answer：The main difference in macro aspect is the regulation of the transmission frequency and bandwidth available to the product in the standard, the frequency and bandwidth of the five kinds of products are 100 MHz, and the frequency and bandwidth of the six kinds of products are 250 MHz. The difference between the two parts is mainly the requirements of different manufacturing parameters and electrical parameters of different products. For example, the wire diameter of the Category 5 cable and the wire diameter of the Category 6 cable are different. The electrical performance is mainly the insertion loss IL, the near-end crosstalk NEXT, the return loss RL, and the equal-level far-end crosstalk ELFEXT.

answer：The voice employs the 4-pin RJ 11 interface. Data employs 8-pin RJ45 interface, and the RJ45 interface of the data can be compatible with the voice-compatible FAT11 interface, that is, it can be shared. However, in practical engineering applications, as the crystal head of the trocar 11 is vulnerable to damage to the first and eighth needles of the data module, it is recommended that such practices be avoided as much as possible.

answer：The order of the two wiring lines is: T568A and T568B. The wiring order of T568A is: White-green, green, white-orange, blue, white-blue, orange, white-brown, brown. The wiring order of T568B is: white-orange, orange, white-green, blue, white-blue, green, white-brown and brown.

answer：TP---Twisted Pair UTP--Unshielded Twisted Pair FTP---Foil-shielded Twisted Pair STP---Shielded Twisted Pair LSZH---Low-smoke halogen-free U/ UTP twisted pair: commonly known UTP twisted pairs, non-shielded twisted pairs; F/ UTP twisted pair: The total shielding layer is made of aluminum foil, and there is no shielded twisted pair of the shielding layer. U/ FTP twisted pairs: there is no total shielding layer, and the wires are shielded twisted pairs that are shielded by aluminum foil; SF/ UTP twisted pair: The total shielding layer is the double shielding of screen + aluminum foil, and the wire pair has the double shielded twisted pair without shielding; S/ FTP twisted pair: The total shielding layer is a double shielded twisted pair shielded by aluminum foil for screen and wire.

answer：The CAT marked on the cable is based on the stipulations of USA Electrical Industry Association/ Telecommunication Industry Association (EIA/ TIA), and classifies cables and connectors at various or different levels, and expresses the upper limit of different types of transmission frequencies. CAT3 means the transmission frequency of Category 3 is 16 MHz. CAT5 means the transmission frequency for Category 5 and CAT5E is 100MHz. CAT 6 means the transmission frequency of Category 6 is 250MHz. The specific application way is shown as follows: 

answer：When different types of devices are used in the same wiring, the transmission performance of the link is determined by the lowest level of device. As on a horizontal link, modules and cables use six categories of products, but the jumpers use five categories, so the link transmission performance level can only reach five categories. The application of integrated wiring and Aisle classification A: According to the application of integrated wiring, the application category is: Level A-voice frequency band and low frequency application. The symmetrical cable permanent links and channels of the supported class a applications are referred to as a class a permanent link and a class a channel, respectively. Its highest frequency is up to 100 kHz. Level B — The data application of bit rate. The symmetrical cable permanent links and channels of the supported B-level applications, respectively, are referred to as the B-level permanent link and the B-level channel, respectively. Its highest frequency is up to 1 MHz. Level C-High bit rate data application. The symmetrical cable permanent links and channels of the supported C-level applications are referred to as the C-level permanent link and the C-level channel, respectively. Its highest frequency is up to 16MHz. Class D-Very high bit rate data application. The symmetrical cable permanent links and channels of the supported class d applications are referred to as D-stage permanent links and d-stage channels, respectively. Its highest frequency is up to 100 MHz. Level E-Higher bit rate data application. The symmetrical cable permanent links and channels of the supported E-level applications are referred to as the E-level permanent link and the E-level channel, respectively. Its highest frequency is 250MHz. Fiber-optic cable-high-speed and very high bit rate data applications. Fiber-optic permanent links and channels that support fiber-level applications are referred to as Fiber Channel, respectively. The user may be dependent upon the needs. The bandwidth is generally not limited. When the highest frequency is generally 10 MHz and the above application complex wiring is used for a particular application system, one or more channels may be included. The channel can be divided into different levels according to the connection cable and related connecting hardware, and the corresponding application category can be supported. Class A symmetrical cable routing links: Supports Class A applications and provides the lowest level of links. Level B Symmetric Cable Wiring Link: Supports Level B and Level A applications. Level C Symmetric Cable Wiring Link: Support Class C, Class B and Class A with Class D Symmetric Cable Wiring Link: Supports Class D, Class C, Level B, and Level A applications. Class E Symmetric Cable Wiring Link: Supports Class 1E, Class D, Class C, Class B, and Level A applications. The optical cable wiring Aisle specifies the relevant parameters according to the single-mode optical fiber and the multi-mode optical fiber, respectively. For fiber optic Aisle, the minimum transmission performance specified by the Aisle shall be capable of supporting applications at 10 MHz and above.

answer：bandwidth refers to the frequency range of a channel that can be transmitted without distortion and refers to how much data transmission can be provided per unit time. The unit is (hz) the transmission rate refers to the number of bits transmitted per second, the rate being the maximum available transmission rate within a unit time, the unit being (bps, bit/ s) bandwidth can be compared to the number of lanes on the highway. The data transmission rate can be compared to traffic flow or the number of vehicles per hour. One way to expand traffic flow is to broaden the highway, while the other is to improve the quality of the road and eliminate bottlenecks. Similarly, it is possible to allow each HZ frequency in the available bandwidth frequency to carry more information bits, but this requires a better signal-to-noise ratio. The larger the bandwidth provided, the faster the transmission rate.

answer：10BASE-T: 10Gbit/ s Ethernet based on 2-wire application 100BASE-TX: 100Mbit/ s Ethernet based on 2-wire application 100BASE-T4: 100 Mbit / s Ethernet based on 4 wire applications 100BASE-T2: 100 Mbit / s Ethernet based on 2-line full-duplex applications 1000BASE-T: 1000 Mbit / s Ethernet based on 4-line full-duplex applications 100BASE-VG: 100 Mbit / s based on 4 Alignment-based Demand Priority Network

answer：Of course optical fibers are applicable, but all-optical wiring systems are expensive. Basically, the price determines the user's choice, and the price of a fiber-optic cabling system plus fiber-optic transceiver equipment is a 6-class wire system plus twice the network transmission device. And the installation process of the wiring system is simple, and only a simple process and basic installation technology are needed.

answer：The main difference is that the shielded twisted pair cable is twisted with respect to the non-shielded twisted pair cable, and the shielding layer (such as aluminum foil, metal braid net, etc.) is added to the cable so as to have the characteristics of preventing external electromagnetic interference and preventing outward radiation. Better meet the requirements of Electromagnetic Compatibility (EMC) requirements; Most of the general engineering adopts unshielded twisted-pair cables, and shielded twisted-pair cables are used in high-security units, such as government agencies, military, industry, etc.