Fiber optic transceivers, Ethernet switches, industrial-grade PON, and OLT equipment foundry Hai Diwei today introduces to you about the OSI Layer 7 network structure.
Physical layer: 80211b defines the work in 2The physical layer with a data transmission rate of 11 Mbps on the 4GHz ISM band uses frequency-hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSSS).
1. MAC layer: The MAC layer provides a variety of functions to support wireless network operation. Through the MAC layer site, you can establish a network or connect to an existing network, and transmit data to the LLC layer.
2. LLC layer: IEEE80211 uses with IEEE8022 identical LLC layers and 48-bit MAC addresses, which makes bridging between wireless and wired very convenient. But the MAC address is only determined to the WLAN.
3. Network layer: The IP protocol is the most important protocol in the Internet, which stipulates the guidelines that should be observed when communicating on the Internet.
4. Transport layer: TCP UDP protocol, TCP is a connection-oriented protocol, which can provide reliable transmission in the IP environmentUDP is a connection-oriented protocol that does not provide reliable transport for IP. For highly reliable applications, the TCP protocol is generally used for the transport layer.
5. Application layer: implemented according to application requirements, such as HTTP protocol and DNS (Domain Name System) protocol. At present, Alpha mainly provides equipment at the network layer and transmission layer, such as all-optical replacement, SFP optical transceivers, GPON OLT, and GPON ONU series.
The above is the introduction of the OSI7 layer network structure, if you have anything else to know, welcome to pay attention to Ha.