The definition of the protocol is the communication label of the column, the two sides of the communication need to jointly carry out the normal data transmission according to this standard. In computer communication, the communication protocol is used to realize the labeling between the computer and the network connection, if there is no unified communication protocol, the information transmission between the computers can not be identified, the communication protocol is the communication rules agreed by the two sides in advance. It can be simply understood as the common language used by computers to talk to each other

 The protocol stack refers to the specific implementation form of the protocol, we generally speaking is the library function implemented with code, so as to facilitate the call of the developer. Protocol stack is the sum of protocols in each layer of the network, and its image reflects the file transfer process in a network. From the upper protocol to the lower protocol, and from the lower protocol to the upper protocol.

Network designers use a hierarchical network architecture, the process of communication between two hosts, including switching equipment, the protocol works like a stack, so it is called a protocol stack.

 Host a: Application layer- -> Transmission layer- -> Network layer- -> Data Link layer- -> Physical layer, corresponding host b: Physical layer- -> Data Link layer- -> Network layer- -> Transmission layer- -> Application layer

The above is a brief explanation of the difference between the protocol and the protocol stack brought by Shenzhen HDV Phoelectron Technology Co., LTD. The relevant network equipment of Shenzhen HDV Phoelectron Technology Co., LTD.. has software compatible with our products, these network products are ONU series, optical module series, OLT series, transceiver series. Welcome to demand personnel for detailed product understanding !

VLAN refers to the virtual local area network, is a group of logical equipment and users, the communication between this group of equipment and users is similar in the same network segment, can be different locations, different networks, different users together to form a virtual network environment, just like the use of local LAN as convenient, flexible, effective. VLAN can reduce the management cost of moving or changing the location of workstations, especially for some companies with frequent changes in business conditions, this part of the management cost is greatly reduced 

Vlan isolation is actually based on the role of Vlan technology, through the Vlan division of different ports, equipment terminals, users to achieve complete isolation of business data. In addition, Vlan isolation can be based on the port of the switch Vlan partition for networking isolation, also can be based on IP Vlan partition for networking isolation Ethernet switch under VLAN technology, you can build multiple LAN, in real life, want to build a different LAN for each port, For example, the R&D department, business department, operation department, etc., of the same company

Thank you for reviewing the introduction of VLAN isolation function of Ethernet switch brought by Shenzhen Haidiwei Optoelectronic Technology Co., LTD., Our switch product series, also covers a number of specifications of the switch, such as: all optical port switch, 8 port switch, 100 MEGABit switch, network management switch and so on, welcome to visit.

16, Broadband and Dial-up

We used to use ADSL broadband. ADSL: Asymmetric Digital Subscriber Line.

Broadband is used by connecting a phone line from your broadband carrier to your indoor modem (commonly known as a cat) and then using the cable to connect to other Internet-connected devices.

 After years of development, ADSL has gone through three generations, from the original ADSL to the later improved ADSL2 and now ADSL2+, the download speed can now reach up to 24M. ADSL uses frequency division multiplexing to realize that the telephone signal, uplink and downlink signals do not affect each other.

 Today, more use of fiber to the house (FTTH), after all, light transmission speed than electricity transmission speed, more efficient. FTTH works by pulling a fiber optic from the carrier to your home and connecting it to a light modem (commonly known as a light cat). Then use an Internet cable from the light cat to lead to the Internet.

 Dial-up Internet generally refers to PPPoe dial-up, which is a way to access the Internet, both ADSL broadband dial-up (telephone line transmission) and fiber optic dial-up (fiber optic transmission). PPPoe refers to Point-to-Point Protocol Over Ethernet, which means that there are two identities of server and client in the point-to-point protocol PPPoe on the Internet. The operator receives and sends information to the client of ordinary users as a server, which is a one-to-many topology. In order to distinguish the identity and qualification of each client, each user needs to register an account and password in the operator, and then input the account and password on his computer using specific software to send it to the operator’s server. If the account is legal, he can access the Internet normally. Of course, sometimes we will find that we can access the Internet without entering the account password in the computer. That is because the account password is preset on the cat, so we don’t have to enter it manually.

The above is a brief explanation of broadband and dial-up brought by Shenzhen HDV Phoelectron Technology Co., LTD. The relevant network equipment of Shenzhen HDV Phoelectron Technology Co., Ltd. has software compatible with our products, these network products are ONU series, optical module series, OLT series, transceiver series. Welcome to request personnel for detailed product understanding

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