A simple definition of the fourth layer exchange is that it is a function that determines transmission based not only on the MAC address (the second layer network bridge) or source/destination IP address (the third layer routing) but also on TCP / UDP (the fourth layer) application port number. The fourth layer exchange's function is like a virtual IP, pointing to the physical server. It transmits services that are subject to a variety of protocols, including HTTP, FTP, NFS, Telnet, or other protocols.The principle of the fourth layer switchThe fourth layer of the OSI model is the transport layer. The transport layer is responsible for end-to-end communication, that is, communication coordinated between the network source and the target system. In the IP protocol stack, this is the protocol layer where TCP (a transport protocol) and UDP (user packet protocol) are.In the fourth layer, the TCP and UDP headers contain the port number, which uniquely differentiates which application protoc..
How to choose the switch for the HD monitor application?
Posted on Jun 30, 2017 by cozlink.com
Network monitoring system in our security occupies an absolute position. In the high-definition network video surveillance system, customers often have a feedback of the delay, Caton and other phenomena, caused for many reasons, but in most of the situation, they are caused by unreasonable switch configuration resulting in insufficient bandwidth. The switch is an indispensable device for the whole system. Whether it is properly configured or not directly affects the later stability of the network monitoring system.When selecting a switch, the backplane bandwidth and packet forwarding rate should be considered. The backplane bandwidth marks the total data exchange capacity of the switch. The higher the backplane bandwidth is, the stronger the ability to process the data. Packet forwarding rate also known as port throughput refers to the packet forwarding capacity of the router in a port. The higher the packet forwarding rate is, the better the performance.From the network topology, a la..
The difference between industrial switch and general switch
Posted on Jul 04, 2017 by cozlink.com
In terms of performance, industrial Ethernet switches and ordinary switches are not much different. From the network level, there are two switches, of course, there are three switches. Industrial Ethernet switch has a stress in its product design and component selection, which meets industrial field use needs. In the mechanical, climate, electromagnetic and other relatively poor circumstances, it is still able to work properly, so it can often widely used in the more harsh conditions of industrial production scenarios. So, what are the differences between industrial Ethernet switches and ordinary switches in the end?1. ComponentsThe selection requirements of industrial Ethernet switch components are higher, which should be able to better meet the needs of the industrial production site.2. Mechanical environmentIndustrial Ethernet switches are better able to adapt to harsh mechanical environments, including vibration resistance, impact resistance, corrosion resistance, dust prevention, ..
Differences between the RJ45 port and the SFP port of the switch
Posted on Jul 04, 2017 by cozlink.com
We know that in the present market, Gigabit Ethernet switches generally have two ports: RJ45 port and SFP port, both of which can be transmitted with Gigabit Ethernet. Then what are the differences between the two ports? How should we wire them respectively? This tutorial will answer one by one.Gigabit Ethernet switch’s RJ45 port and SFP portIn order to meet the growing network needs, network upgrade in the machine room of the data center or server is urgent. Therefore, Gigabit Ethernet has become increasingly common. So, what kind of port Gigabit switch should be used to achieve Gigabit Ethernet connection? The following is the introduction to two ports in detail:RJ45 portGigabit Ethernet switch’s RJ45 port is a built-in port. To connect two RJ45 port Gigabit Ethernet switches, we only need to use a super five or six cable. The following table is the specific rate and bandwidth of this connection:
Maximum transfer rate（distan..