网线线序及网线转rs232—— db9线序（The network line sequence and the net line turn RS232 - DB9 line foreword）.docVIP

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网线线序及网线转rs232—— db9线序（The network line sequence and the net line turn RS232 - DB9 line foreword）.doc

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网线线序及网线转rs232—— db9线序（The network line sequence and the net line turn RS232 - DB9 line foreword）

网线线序及网线转rs232—— db9线序（The network line sequence and the net line turn RS232 - DB9 line foreword） There are two kinds of cable production standards: 568A and 568B, the cable ends are the same as the standard parallel line, used to connect different types of equipment, for example: the connection between the switch and the computer; both ends are different from the standard cross line, used to connect the same type of equipment, such as: two computers. 568A line order: green, white - Green - orange, white - Blue - blue, white - Orange - brown white - Brown 568B line order: orange, white - Orange - green, white - Blue - blue, white - Green - Brown - white - Brown (that is, 568As 1 and 3, 2 and 6 can be switched) 72--75 72+1 network address 73+2 switch address Then RS232--DB9 public 2, 3, 5 colors correspond to blue, blue, white, orange (crystal head, 568A), blue - blue, white - green (crystal head 568B) The mothers 2, 3 and 5 colors correspond to blue, white, blue, and orange (568A at the end of the crystal), blue, white, blue, and green (568B at the end of the crystal) There are 2 ways to connect a switch to a network cable. First, the crossover line is used to connect the common mouth of the 2 switches (this line is also used for the direct connection of 2 computers) Two, the standard line is connected to the ordinary mouth of the switch, and the other end is connected to the connecting port of another switch (the line is also used for the connection of the computer to the switch) -*- The usual switches are connected. It is marked Up-link or X (and some models are blank except for level), and all others are painted X It is recommended that the standard line be used when the switch has a level connection. Because the switch - computer connection uses the same kind of line for easy management and maintenance Really helpless and the use of cross the line and connection, pay attention not to switch - computer with standard line up -*-*-*-*-*-*- I. intersection lines One