what is difference between riser and plenum cable

three types of connections: Male to female, male to male. Mother to mother. Each of the three connectors has crossover lines and straight lines, so there is a total of 6 connections in the same way.Question 2: How to identify the cross-serial line and direct-connect serial line?Check it with a multimeter. Suppose 2 and 2 pass. The general 3 and 3 are straight serial lines. Assume that the 2 and 3 pass, 3 and 2 general are cross-serial lines.Someone c

1, LCD TV cable Signal line interface (analog signal) is a radio frequency interface (also known as RF interface, coaxial cable interface, closed route interface), digital signal through the set-top box to convert analog signal video output to the TV, in order to watch TV programs.2, TV or HD set-top box on the HDMI interface

declare this function and you can use it. 1, what is the difference between a static global variable and a normal global variable? What is the difference between a static local variable and a normal local variable?

Line sorting is generally divided into two kinds of standards, one is the 568A standard, the other is the 568B standard, and generally we use the network cable is the most commonly used 568B standard, its network cable connector s

What is the definition in C language? What is the meaning of the statement? What is the difference between them ?, Meaning difference In th

Interrupt:Interrupts caused by processor external events are called external interrupts, also known as interrupts. In x86, it is called an asynchronous interrupt, which is generated randomly with the CPU clock, and can occur in the execution of an instruction or after an instruction is executed. Includes I/O interrupts, external interrupts.Capture:Interrupts caus

Problem: The contents of the PHP manual for overloading are as follows: PHP provides a "reload" (overloading) that refers to dynamically "create" class properties and methods. We do this by means of magic methods. such as __call ($funcname, $arguments), __callstatic ($funcname, $arguments) Overloading in the Java language refers to the ability to create multiple methods in a class that have the same name but have different parameters and different definitions. Methods are invoked by the number

[Mysql] What is the difference between mysql and mariadb? What is the difference between mysqlmariadb? After leaving Sun, Mr. Widenius, the father of MySQL, thought that relying on Sun/Oracle to develop MySQL was very unreliable,

What is a scripting language? What is a compilation language? What is the difference between the two ?, Script language compilation What

What is the difference between arraylist and vector? What is the difference between hashmap and hashtable? Arraylist and vector are mainly used in two aspects.1. Synchronization: the vector i