what is dwdm in telecom

a redundancy mechanism, you cannot take it lightly. The best solution is not to create another Redundancy mechanism for the redundancy mechanism. Proper maintenance is enough.=== Let's start talking about the main thing, a task about redundancy ===About WifiIs a child shoe of life's best products. Have you considered the feeling of "electricity?Wifi is important

Tags: data query UDP Telecom SQL statement action commit SQLite lightweight service sideThe database is divided into two major categories, relational database and non-relational database. MySQL is a relational database.What is a relational database?1. Relational databases, in essence, use a two-dimensional table to rep

Recently, many people are asking what the vswitch, hub, and router are, what are their functions, and what are their differences. I will give some simple answers to these questions. First, the hub, that is, the hub. Its function can be simply understood as connecting some machines to form a LAN. The switch (also known

What is the difference between Apple iPad and ipad2 in 3G and WiFi? I believe this is a concern of many friends! You will understand the following 20 questions! 1. What is the difference between Apple ipad2 3G edition and WiFi edition? In terms of appearance, the top and bac

DBA supportMongoDB will be your first choice if you don't have a full-time DBA and are prepared to process data without using standard relational ideas (structured, connected, etc.). MongoDB is very handy for storing like data, and classes can be serialized directly into a JSON store in MongoDB. However, you need to understand some best practices to avoid performance flaws due to document design problems when the data becomes larger. billrun– M

transfer the data in the memory to the user's browser, which can significantly improve the browsing speed and efficiency. More importantly, the proxy server is an important security function provided by the Internet link-level gateway. It mainly works in the Open System Interconnection (OSI) the dialog layer of the model. Main functions include: 1. Break through its own IP address access restrictions and access websites outside China. CERNET, 169,

Safety and security experts help you divide the reason why the internet slows down The reason for this is that your broadband line is aging, or it is damaging (router) Reason two, if the computer and other computers share a network cable, it may be your computer by the ARP virus attack Reason three, there is a progr

different, the change is hard to say, such as secket or other software to simulate the access of the client ------Solution-------------------- Reference: Reference: The head must be without this information, PHP can not judge. That should be how to judge, look at the Android client is very good to judge. What external programs do yo

Address: http://justmei.blog.163.com/blog/static/1160998532010321112522467/ What is the CDC class (communication device class) Usb cdc class is short for USB communication device class. The CDC category is a type of USB subclass defined by the USB organization for various communication devices (