db25 to rj45

transmission media, and electrical equality are different. The following describes the most commonly used Ethernet NIC. Ethernet adopts CSMA/CD (carrier-based multi-channel access/conflict detection) control technology. He mainly defines how the physical layer and data link layer work. The data link layer and the physical layer implement their own functions, so they do not care about how the other party operates. There are standard interfaces (such as MII and gmii) between the two to transmit d

Uses external hosts to penetrate the local network firewall, and hosts to penetrate the Network Firewall This article mainly records a method to penetrate the local firewall, that is, reverse connection. I will write this article while studying and practicing it. The process may not be the most concise, but it only serves as a reference for myself and future generations. What I need to achieve: Host A used by the author. In Lan A, the author does not have the management permission of lan a, and

Many people (including the author) think that 10 Base-T 10 m networks use four of the eight signal lines in the network cable, the 100 Base-t m uses all eight signal lines (or how fast ?). However, when the author recently used a 10 m direct connection method (switching between 1 and 3, 2 and 6, and shielding the other four lines) to connect the network cable, unexpectedly, it was found that the Network was being transmitted at a speed of MB, so I had to worry about it. So I checked a lot of inf

RJ-45 plug is a plastic connector that can only be inserted along a fixed direction and automatically prevent shedding, commonly known as "crystal head", terminology for RJ-45 connectors (RJ-45 is a specification for network interfaces, there is also a similar RJ-11 interface, is our usual "telephone interface", used to connect the telephone line ). It is called the "crystal head" because its appearance is crystal clear. This RJ-45 plug must be installed at both ends of the twisted pair to Facil

1. Connect Network In the WiFi network, find the "meizu-xxxx (typically four-bit MAC address)" Hotspot and connect. 　　  2. Log in and set up the network Web End settings: In the mobile browser or computer Browser input "192.168.232.1", using the default account, password (all admin) login; 　　  App-side settings: Focus on the Charm family smart home Micro-letter public number (ID:MZSZ01), through the menu options, "My Charm home-> The Phantom router app" can access t

to create a WiFi hotspot, enter the password to connect to the wireless internet 6, the Millet box enhanced version has no network cable interface (standard version has network card interface), using the above method need to buy a USB switch RJ45 network card, we can go to x PO search "USB Turn RJ45" can be found, about forty or fifty yuan appearance, as shown in the following figure: Because the Mil

What if the wireless router does not surf the Internet? First of all, of course, plug in the power cord, next is the network cable to connect the hardware equipment. The blue RJ45 interface in the figure is a WAN (usually only 1) connected to the ADSL modem via a network cable, while the four yellow RJ45 interfaces are LAN ports (usually 2-4), which are connected to a computer or notebook via a network ca

the local area network has specified the correct IP address. (2) Use the ping command to see if other computers can ping. If it does not work, it proves that there is a problem with the network connection, if you can ping but sometimes lose packets, it proves that network transmission is blocked, or network equipment contact is not good, need to check network equipment. (3) When the entire network is not working, it may be a switch or hub problem, to see whether the switch or hub is functioni

choose an image port or an internal parser. But whenever possible, it is best to connect one of the hosts and parsers to the hub and hang the hub on the switch. Why do you do that? This is because the trace remains unreliable even if the switch has sufficient capacity to cache all the data frames so that the image port or internal analyzer is unlikely to lose data. For example, in standard Ethernet, a RJ45 connector that is in a faulty port on the sw

dividers, information outlets need to be installed on the wall; for large bays, choose the following two types of installation methods: 　　 1) Information socket installed on the ground 　　 The metal bottom box required to be installed on the ground shall be sealed, waterproof, dustproof and capable of lifting and lowering. This method is of high cost for design and installation. And because the office location of the staff can not be foreseen, so flexibility is not very good, it is recommend

? And is this the process that we as a comprehensive national power in this time should not be "a worm"? Of course, Twinsen is not simply to raise questions and criticisms, not to oppose HTML5.0; we can think of a more sensible solution: Use XHTML's requirements (4 points above) to write HTML5.0. Recommended browsers use a dual-resolution kernel, one to the standard page, one to non-standard. (When non-standard pages use standard DOCTYPE, parsing is misplaced or directly closed or unr

and ease of termination. Cable using a split-line shielding and full shield plus split-line shielding mode, providing excellent resistance to EMI and reduce radiation leakage ability. Fig. 4 in the construction of seven types of systems, in the wiring, still use the multimedia distribution frame, by installing the seven class module to the distribution rack management also provides a dedicated non-pre-installed 7 type of empty distribution racks. Considering the current terminal equipment is

First, login switch First find a console line that connects the computer's serial port to the console port of the switch. (Note: console[console] One end of the line for the RJ45 Crystal Head, one end with the DB9 of the serial port, if you want to make this line, you can use a UTP cable will be used to connect the two ends, that is, the opposite ends of the line sequence, and then with a RJ45 to DB9 conne

. Build a small local area network at home, just apply for a broadband Internet connection, so that each room can use the computer at the same time Internet. In addition, with the trend of Home appliance network, Network Audio-visual center, network refrigerator, network microwave, network video monitoring will appear, these devices can find the nearest network interface access network. Wiring characteristics: The general LAN is a star topology structure, any node or connection cable failure, w

, to meet the needs of data communication, has a strong application value. 1 Ethernet-based laser wireless communication system The combination of Ethernet and laser wireless communication can give full play to the advantages of the two systems and improve the application range and reliability of the system greatly. Fig. 1 is a schematic diagram based on one end of the Ethernet laser wireless communication system, and the other end of the structure and the end of the symmetrical state. From

, according to the replacement of products, can be changed to 1, 2, 3, 4; A2 for the 5-L2/L3 switch, currently 5, according to the replacement of products, can be changed to 6, 7, 8, 9; A3A4 two digits are related to the number of ports in the product, which determines the product family based on the total number of ports: A3A4 is 08-indicates that the downlink port is 8, the uplink port is 0, 1, 2; A3A4 is 12-indicates that the downlink port is 12, the uplink port is 0, 1, 2; A5 is used to

Take the Samsung notebook from the "Samsung set up Center" for example, on the Network tab, in the Move Hotspot settings interface, open the switch that uses my device as an Internet access point (AP) to automatically generate an SSID (Wi-Fi hotspot name) and a corresponding password. This is to share the notebook network (via RJ45 connected wired network) to other mobile devices. Similarly, Lenovo notebook can be in the "Lenovo Center" Netwo

At present, the construction of intelligent community has gradually become a hot topic, and the construction of data network will become an important part of intelligent community construction. At the same time, the intelligent and networked residential district will bring new market opportunities to the developers of the community. For intelligent community Construction, 3Com according to the different operating environment and user requirements, the following solutions are proposed: Intellig

lit Observe the back side of the NIC RJ45 side has two lights, they are the connection status LED and signal transmission led, where the normal state of the connection status indicator is green and long bright, signal LED is red, normal should keep flashing. If the connection LED is found, that is, the green light is not lit, it means that the network card connected to the hub or switch connection has a router failure. This can be used to block the

of twisted pair The distance between the server and the switch from 5 meters to 60 meters, the result is not connected anyway, why? Ethernet generally uses two pairs of twisted-pair lines, arranged in 1, 2, 3, 6 position, if the use is not two pairs of lines, but the original pair using the line used separately, will form winding, resulting in a larger crosstalk ( NEXT), which affects network performance. The reason for this failure is that 3, 6 do not use the pairing line, in the case of lon