best network cable tester

How to differentiate between dual-screen and unshielded Network cables and dual-screen network cable shielding As a part of the Integrated Wiring Design and Construction, the network cable is the basic medium for most information transmission systems. Its importance is self

gently pull the network cable and the crystal head to see if it is pressed tight. It is best to press it once more. The most important thing is to pay attention to the correct pressure position. 　　　　　　　　　　　　　　　 　 So far, this RJ-45 head is better. Follow the same method to create the crystal head at the other end of the twisted pair wire. Note that the core line sequence must be the same as that at the oth

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. Here, the author reminds readers that when using the HUB, switch, and other collection line equipment, these two standards cannot be mixed. When the dual-host interconnection does not use a hub, the T568A standard must be adopted first, and the T568B standard must be used on the other. According to regulations, the ports 1 and 2 of the network adapter send data, while the ports 3 and 6 are the receiving data pins. 1, 3, 2, 6 line swap is mainly to e

CATV Broadband Integrated Information network based on 3COM company CATV Access Network platform is a successful implementation of cable TV, data communication and network telephone "three nets in one" on the 750MHz bandwidth fiber-optic coaxial hybrid network (HFC). The ope

If you want external devices to access the local website, use the network cable to access the network connected by the route. if you want to ask a non-wireless network adapter, you can set up a local server. after you use a wireless network card to connect to the

If you want external devices to access the local website, use the network cable to access the network connected by the route. if you want to ask a non-wireless network adapter, you can set up a local server. after you use a wireless network card to connect to the

The access network system is widely used and has been well developed in various fields. It also plays an important role in cable TV return. After more than 20 years of development, China's cable TV network line is now more than 3 million kilometers in length, the optical fiber trunk line reaches 0.26 million kilometers

If you want external devices to access the local website, use the network cable to access the network connected by the route. if you want to ask a non-wireless network adapter, the local server will be connected by a wireless network card, an external device can access a loc

Ask a question, the local server, with the wireless network card network, the external device can be automatically generated by IP access to the local site, and through the network cable routed through the network, IP becomes 192.168 ... , the external access is not, how to

With the rapid development of broadband multimedia service and optical fiber communication technology, optical fiber communication technology has been used more and more widely in the access network. In the past, optical fiber network is mainly to meet the needs of transmission network construction, access to the layer of fiber optic

background : Some days ago the team in the terminal equipment and server long connection business testing, found that a situation: after unplugging the device side of the network cable, and then plug in the network cable, and sometimes can continue to normal long-run requests, and the use or unplug the

Prepare tools: Network cable, crystal head, crimping clamp, network cable Tester Theoretical Understanding: Differences between direct connection and twisted pair wires Two standards for network

range should be measured. (2) near-end crosstalk +: Crosstalk is divided into near-end crosstalk and remote crosstalk (fext). The tester is mainly used to measure next. Due to line loss, the value of fext has little impact. The next loss measures signal coupling from one line to the other in an UTP link. For UTP links, next is a key performance indicator and the most difficult to accurately measure. As the signal frequency increases, the measurem

I. Overview The industry has been concerned about the characteristics of network data cable skins, such as whether the skin can meet the standard of flame retardant or low smoke, the presence of a high ignition point, fire resistance, and a halogen with the latter characteristic that releases poisonous gas in the combustion. Network wiring professionals and the

MHz. The frequency range is increased. It is obviously inappropriate to use the previous test accuracy. Because the three-level precision testing standard is for the previous definition of the test bandwidth to the existing 250MHz frequency. The new 6a/EA-Level test requires an updated precision category to be differentiated, that is, enhanced Level IIIa ). Of course, for ISO Class FA, there is an enhanced Level 4 Precision Level IVa. Currently, the four-level precision category is less than 60

be placed on the MDI (uplink) and connected with a direct connection line. If the Hub does not have a dedicated-level connection port, or you cannot use a level-level connection port, you must use a MDI-X port level connection, then we can use a line to achieve the purpose, the line reference is as follows. Name nic1 nic2 name Tx + 1 3 RX + TX-2 6 RX- RX + 3 1 Tx + RX-6 2 TX- 3.100 M Hub Connection, or direct connection between two computers: We should also know that the

The following is the 3 machine in the same time period of network bandwidth usage, from the following three figures can be seen, machine a bandwidth usage is very unstable, suddenly high and low, the bandwidth used in the previous second 1M, the next second may reach 20M, machine B and machine C bandwidth usage is obviously more stable, first look at the following:Machine-AMachine-BMachine-CAbout machine A This situation, I started to think hard disk

http://blog.chinaunix.net/space.php?uid=20357359do=blogcuid=1798479Under Linux detects the network card and the network cable Connection status, uses the IOCTL to send to the socketSIOCETHTOOL命令字。 #include #include #include #include #include #include #include #include #include #include #include int get_netlink_status (const char *if_name);int main (){if (Getuid (

(Illustration) Basics of network formation: network cable production-Linux Enterprise Application-Linux server application information. For details, see the following. Differences between express connect and crossover Main Line, that is, Express Line , Standard 568B): the two ends have the same line sequence. The line sequence from left to right is: White orange,