What is address book synchronization and an introduction to synchronous communication

Contacts synchronization is to synchronize the contacts, text messages, call logs, etc. to the cloud, so that even if the phone has an accident due to various reasons, it can be found on the phone after it is done or compared to the phone.

The address book is a simple and practical notebook carrier that is convenient for individuals or businesses to contact. At present, the address book is divided into paper address book, electronic address book, mobile phone address book and network address book.

Contacts is an application service that uses the Internet or mobile Internet to realize the synchronization, update and backup of address book information. You can enter the contact's mobile phone number, email, QQ, msn, mailing address and other address book information on any networked device such as personal computer, PDA, mobile **, etc., or group, manage and update the previous information, under the permission, the contact can see other contact information in the group, so as to achieve address book sharing, if the contact updates their contact information, the address book will be automatically updated, to achieve synchronization of the address book, and leave the old version of the address book information.

The mobile phone communicates with the special software on the computer through the data cable infrared and Bluetooth. Compare the contacts on the phone with the contacts on the computer, and correct the different contents, so that the contacts on the phone are consistent with the contacts in the software on the computer. When syncing for the first time, some software can choose whether to sync from your phone to your computer, or from your computer to your phone, ......

It is the connection between the address book and the computer, and you can copy the address book to the computer or from the computer to the mobile phone. A data cable and computer connection are required.

2. Click the "Settings" icon at the bottom to enter the settings.

3. Find a general function of the phone in the settings and click "General".

4. There is a "function" option in the general menu, click directly to open the function option 5, you can see that there is an unenabled function. The Contacts Sync Assistant is right inside, click to open this option.

6. Go to the home page of the Contacts Sync Assistant and click "Enable the Feature" to turn on the Contacts Sync function.

In a nutshell, there are two data sources, and initially their data is the same. If the data of a data source is changed after adding, modifying, deleting, or other operations (or the data of both data sources has changed), then in order to make the data of the two data sources consistent, that is, to make the changes of the data of one data source reflect the other, you must perform an operation to make the data of the two data sources consistent, which is called "synchronization". After the synchronization operation is completed, the data on the two devices is exactly the same, and it is in the "sync" state.

Generally speaking, one of the two data sources is server-side and the other is client-side. Due to its powerful computing and processing capabilities, the server side has to do more computing and processing work than the client side during the synchronization process.

For example, there are a lot of contacts stored in Outlook on the computer, and a lot of contacts are also stored in the mobile phone, so how to make the contacts in Outlook and the contacts in the mobile phone consistent? This can be achieved by "syncing". Here, since the computing and processing functions of the computer are more powerful than the mobile phone, we regard the PC as the server and the mobile phone as the client.

When the server (Outlook on the computer) and the client (mobile phone) synchronize for the first time, a "slow synchronization" will take place, and the process is as follows: the client sends all its contacts to the server, and the server compares and analyzes all the contacts received with its own contacts. After the analysis is over, the server sends out contacts to the client that the client does not have, so that the client has contacts that the client has on the server side but did not have before the synchronization, and the server side also adds the contacts that the client has but did not have before the synchronization, so that after the synchronization is over, the contact information on the two devices is completely consistent and is in the "synchronization" state.

It is to let your phone's current address book be transferred to a place to be saved, and when you lose your phone in the future, you can directly retrieve the lost contacts.

Synchronous communication is a kind of bit synchronous communication technology, which requires that both the sender and receiver have the synchronous clock signal of the same frequency and the same phase, and only need to attach a specific synchronization character to the front of the transmitted message, so that the sender and receiver establish synchronization, and then send and receive bit by bit under the control of the synchronous clock.