What is SMS?

The first meaning: English short message service and Chinese short message service.

Short message is the earliest short message service and the most popular short message service at present. Through it, mobile phones can send and receive short messages to each other, and the content is mainly text, numbers or binary non-text data. At present, the length of this short message is limited to 140 bytes. Short message is welcomed by the public because of its simple and convenient use function, but it always belongs to the first generation wireless data service, and there are technical standards restrictions on its content and application.

Short message function

A short message can contain at most 160 characters (even binary).

SMS is a store and forward service. In other words, short messages are not sent directly from the sender to the receiver, but are always forwarded through the short message center. If the recipient is disconnected (the phone may be turned off), the message will be sent when the recipient connects again.

SMS has the function of sending a message to confirm. This means that SMS is different from paging, and users don't simply send short messages and then believe that the messages have been sent successfully. On the contrary, the short message sender can receive the return message and inform them whether the short message has been sent successfully.

The sending and receiving of SMS messages can be synchronized with GSM voice.

SMS messages are charged per message, so they are much more expensive (per byte) than data sent over IP-based networks (for example, using GPRS[]).

To use SMS, users need to subscribe to a mobile network that supports SMS, and users must be able to use SMS. Users need to have a destination to send or receive short messages. This destination is usually another mobile phone, but it can also be a server. Finally, users need to have a mobile phone that supports short messages and know how to send or read short messages with their specific mobile phone.

The second meaning: SMS is the full name of system management server in English, and the Chinese meaning: system management server.

Used to manage large-scale local area networks, many large domestic companies use it.

strong function

Automatically discover the machines in the local area network and automatically install the client;

You can collect all information about client hardware and software, such as cpu, disk, remaining disk space, installed applications, port usage and conflicts. . . Almost all the information;

Distribute software, which can be installed unattended so that customers can install it unconsciously, or package programs that do not support unattended installation into unattended installation;

Customize the query conditions, and you can find machines that meet specific conditions. For example, list all windows with disk C greater than 1g, CPU greater than 700 and ip between 192. 168.0.50 and 192. 100.

Remote control can monitor all the actions of the client (a bit like hacker software);

Software metering, controlling the application programs that customers run in the LAN, for example, only 100 people can use word at the same time;