Difference Between DCE and DTE
⑴What is DCE?
DCE: data communication equipment, DTE: data terminal equipment.
1) The clock rate is only available on the line of synchronous communication mode. In synchronous communication, the signal transmission frequency needs to be synchronized at both ends of the line, that is, the synchronous clock. In actual engineering, the protocol converter, modem and other line control equipment There is no dedicated line control device in the experimental environment, so it is provided by the serial interface of one of the routers. The determination of one end of the DCE is determined by the line sequence of the cables between the routers, so the back to back cables are marked with DCE and DTE.
2) The clock rate needs to be set only if the DCE side is marked
3) The frequency and bandwidth of the synchronization clock are not directly related. 64000 refers to adding and sending synchronization bits at 64000 bit rate intervals.
4) Other values can be set, as long as both ends can reach that standard, it has no effect on communication
(2) What is the difference between DCE and DTE?
The distinction between DTE and DCE is actually only for serial ports, and routers usually connect to WANs through serial ports.
The serial V.24 port (25 pins) usually stipulates that the second pin of DTE is used as TXD (transmit data line), and the third pin is RXD (receive data line), (the remaining pins are: 7 is the signal ground line, 4 It is DTS, 5 is RTS, 6 is DTR, 8 is DCD, and includes sending clock, receiving clock, etc., all have specific pins), serial V.35 (34 pins) is the communication interface standard commonly used by routers , but V.35 uses differential signals for transmission, and the sending and receiving are undertaken by two signal lines. The DCE device is usually docked with the router, so the pin assignments are reversed, that is, 2 is receive (but also called TXD), and 3 is transmit. Therefore, routers are usually DTE devices, and transmission devices such as modems, GV converters, etc. are usually specified as DCEs. In fact, for a standard serial port, it is usually possible to judge whether it is DTE or DCE from the appearance, DTE is a needle (commonly known as a male header), and DCE is a hole header (commonly known as a female header), so that the two interfaces can 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 that needs to learn some parameters from another router. When implementing it, we do not need to configure it on this S0 port." clock rate", which it learns from the other side. At this time it is the DTE, and the other party is the DCE.
(3) What are DCE and DTE?
DTE: Data Terminal Equipment. such as a computer.
DCE: data communication equipment, such as modem.
CSU: Channel Service Unit.
DSU: Data Service Unit.
The equipment that connects the data terminal equipment DTE with the analog channel is called the data circuit communication equipment DCE, like Modem is DCE
1 separate pc is also a DTE
DTE is similar to router DCE is similar to switch, it provides clock rate and switching, so, there is no strict definition, it cannot be said that a certain device is DTE or DCE
