Cros and bitcoin
Publish: 2021-04-28 13:37:24
1. Of course, it's A3. The weight of the car is 1.4 tons. It's all esp. the front and rear wheels are independently suspended, and the direction of the electronic power is with the speed. The whole car has good handling performance. The DVVT engine has 6 high-speed 5.8 oil, and the pure urban area has more than 8 points. The disadvantage is that the workmanship is not very fine. After all, the price is there. Don't compare with the joint venture car, what I'm driving now is 2011 Wolfsburg grey.
2. copper cross-over：
http://ke..com/view/3748381.htm
copper straight-through：
http://ke..com/view/2239124.htm
in fact, the distinction between DTE and DCE is only for serial port, and routers usually connect Wan through serial port
the serial V.24 port (25 pin) usually stipulates that the second pin of DTE is TXD (transmit data line), the third pin is RXD (receive data line), (other pins are: 7 is signal ground wire, 4 is DTS, 5 is RTS, 6 is DTR, 8 is DCD, and including transmit clock, receive clock, etc., all have specific pins), Serial V.35 (34 pin) is the communication interface standard usually adopted by routers, but V.35 is transmitted by differential signal, and the sending and receiving are undertaken by two signal lines respectively. The DCE device is usually connected with the router, so the pin assignment is opposite, that is, 2 is receiving (but also known as TXD), 3 is sending. Therefore, routers are usually DTE devices, and modem, GV converter and other transmission devices are usually defined as DCE. In fact, for a standard serial port, we can usually judge whether it is a DTE or a DCE from the appearance. DTE is a pin (commonly known as male head) and DCE is a hole head (commonly known as female head). Only in this way can the two interfaces be connected together
it is generally used to distinguish interfaces. For example, a router is at the edge of the network. It has an S0 port and needs to learn some parameters from another router. In the specific implementation, we do not need to configure "clock rate" in this S0 port, it learns from the other side. At this time, it is DTE, and the other side is DCE< DCE (data communication equipment or data circuit terminal equipment): the equipment and its connection with the communication network constitute the user network interface of the network terminal. It provides a physical connection to the network, forwarding traffic, and a clock signal used to synchronize data transmission between DCE devices and DTE devices. Modems and interface cards are examples of DCE devices
DTE (data terminal equipment): refers to the equipment located at the user end of the user network interface, which can be used as a source, a sink or both. Data terminal devices are connected to a data network by data communication devices (e.g., modems) and usually use clock signals generated by data communication devices. Data terminal equipment includes computer, protocol translator and demultiplexer
interface standard characteristics between DTE and DCE: mechanical, electrical, functional and proceral. The mechanical characteristics specify the actual physical connection details between DCE and DTE. Electrical characteristics specify the codes that DTE and DCE must use, the same voltage must be used to describe the same state, and the same width of signal bits must be used. These characteristics determine the data transmission rate and distance that can be achieved. The functional characteristics specify the functions to be performed by each switching circuit. According to the functional characteristics of the interface, the process characteristics specify the sequence of events to transmit data
on the one hand, DCE is responsible for sending and receiving bits on the transmission medium or network, one bit at a time. On the other hand, DCE must interact with DTE. Generally speaking, this requires the exchange of data and control information, which is accomplished through a set of switching circuits. In order to run this mechanism, two DCEs that exchange signals on the transmission line or network must understand each other. In addition, each dte-dce pair must be designed to cooperate and interact. In order to ease the burden of data processing equipment manufacturers and users, the communication interface standard is made
RS-232 interface is an interface between DTE (data terminal equipment) and DCE (data communication equipment). DTE includes computer, terminal, serial printer and other equipment. DCE usually only has modem and some switch COM ports as DCE. The standard points out that DTE should have a plug (pin output) and DCE has a socket (hole output). This is often ignored by manufacturers, but has little impact< br /> http://..com/question/231333433.html
http://ke..com/view/3748381.htm
copper straight-through：
http://ke..com/view/2239124.htm
in fact, the distinction between DTE and DCE is only for serial port, and routers usually connect Wan through serial port
the serial V.24 port (25 pin) usually stipulates that the second pin of DTE is TXD (transmit data line), the third pin is RXD (receive data line), (other pins are: 7 is signal ground wire, 4 is DTS, 5 is RTS, 6 is DTR, 8 is DCD, and including transmit clock, receive clock, etc., all have specific pins), Serial V.35 (34 pin) is the communication interface standard usually adopted by routers, but V.35 is transmitted by differential signal, and the sending and receiving are undertaken by two signal lines respectively. The DCE device is usually connected with the router, so the pin assignment is opposite, that is, 2 is receiving (but also known as TXD), 3 is sending. Therefore, routers are usually DTE devices, and modem, GV converter and other transmission devices are usually defined as DCE. In fact, for a standard serial port, we can usually judge whether it is a DTE or a DCE from the appearance. DTE is a pin (commonly known as male head) and DCE is a hole head (commonly known as female head). Only in this way can the two interfaces be connected together
it is generally used to distinguish interfaces. For example, a router is at the edge of the network. It has an S0 port and needs to learn some parameters from another router. In the specific implementation, we do not need to configure "clock rate" in this S0 port, it learns from the other side. At this time, it is DTE, and the other side is DCE< DCE (data communication equipment or data circuit terminal equipment): the equipment and its connection with the communication network constitute the user network interface of the network terminal. It provides a physical connection to the network, forwarding traffic, and a clock signal used to synchronize data transmission between DCE devices and DTE devices. Modems and interface cards are examples of DCE devices
DTE (data terminal equipment): refers to the equipment located at the user end of the user network interface, which can be used as a source, a sink or both. Data terminal devices are connected to a data network by data communication devices (e.g., modems) and usually use clock signals generated by data communication devices. Data terminal equipment includes computer, protocol translator and demultiplexer
interface standard characteristics between DTE and DCE: mechanical, electrical, functional and proceral. The mechanical characteristics specify the actual physical connection details between DCE and DTE. Electrical characteristics specify the codes that DTE and DCE must use, the same voltage must be used to describe the same state, and the same width of signal bits must be used. These characteristics determine the data transmission rate and distance that can be achieved. The functional characteristics specify the functions to be performed by each switching circuit. According to the functional characteristics of the interface, the process characteristics specify the sequence of events to transmit data
on the one hand, DCE is responsible for sending and receiving bits on the transmission medium or network, one bit at a time. On the other hand, DCE must interact with DTE. Generally speaking, this requires the exchange of data and control information, which is accomplished through a set of switching circuits. In order to run this mechanism, two DCEs that exchange signals on the transmission line or network must understand each other. In addition, each dte-dce pair must be designed to cooperate and interact. In order to ease the burden of data processing equipment manufacturers and users, the communication interface standard is made
RS-232 interface is an interface between DTE (data terminal equipment) and DCE (data communication equipment). DTE includes computer, terminal, serial printer and other equipment. DCE usually only has modem and some switch COM ports as DCE. The standard points out that DTE should have a plug (pin output) and DCE has a socket (hole output). This is often ignored by manufacturers, but has little impact< br /> http://..com/question/231333433.html
3. How to apply for ID number? Who can help me
Hot content