Basic technical Specifications of switch

LAN switch is still more commonly used, so I studied the local area network switch basic technical indicators, here take out and share with you, hope for everyone useful. LAN Switch Basic technical indicators are more, these technical indicators reflect the technical performance and function of the LAN switch, is the user to buy products when the important data based on the need to note that the LAN switch these technical indicators represent different meanings, not all users understand, So it is very important to know these technical indexes comprehensively.

1. The number of rack slots refers to the maximum number of modules that can be placed on a rack-type LAN switch.

2. The number of expansion slots refers to the maximum number of modules that can be placed in a fixed configuration with an expansion slot LAN switch.

3. The maximum number of stackable digits is the maximum number of LAN switches that can be stacked on a tiered LAN switch stack unit. Obviously, this parameter also illustrates the maximum port density and information point connectivity that can be provided in a stacked unit.

4. The minimum/maximum number of 10 Gigabit Ethernet ports is the minimum/maximum number of 10 Gigabit Ethernet ports supported by a LAN switch.

5. The minimum/maximum number of 100 Gigabit Ethernet ports is the minimum/maximum number of 100 gigabit Ethernet ports supported by a LAN switch.

6. The minimum/maximum number of 1000 Gigabit Ethernet ports is the minimum/maximum number of 1000 gigabit Ethernet ports that a LAN switch can connect to.

7. The supported network type. Under normal circumstances, fixed profiles with no expansion slots LAN switches support only one type of network, rack LAN switches and fixed configuration with expansion slots LAN switches can support more than one type of network, such as supporting Ethernet, Fast Ethernet, Gigabit Ethernet, ATM, Token Ring, and FDDI. The more network types a LAN switch supports, the stronger its availability and scalability.

8. The maximum number of ATM ports. The maximum number of ATM ports is the maximum number of ATM ports supported by an ATM LAN switch or a multiple service multifunction LAN switch.

9. Maximum number of SONET ports. SONET (Synchronous optical transmission network) is a high-speed synchronous transmission network specification, the maximum rate can reach 2.5gbit/s. The maximum number of SONET ports for a LAN switch refers to the maximum number of SONET interfaces for this LAN switch.

10. The maximum number of FDDI ports is the maximum number of FDDI ports supported by a FDDI LAN switch or a multiple service multifunction LAN switch.

11. Backplane throughput is also called backplane bandwidth, which is the maximum amount of data that can be throughput between the LAN switch interface processor or interface card and the bus. The higher the backplane bandwidth of a LAN switch, the stronger the ability to process data, but also the higher the cost of design.

12. The buffer size. Sometimes called packet buffer size, it is a queue structure that is used by LAN switches to coordinate the speed matching components between different network devices. Burst data can be stored in a buffer until it is processed by a slow device. Buffer size should be moderate, too large buffer space will affect the normal communication state packet forwarding speed (because too large buffer space requires a relatively little bit of addressing time), and increase the cost of equipment. And too small buffer space in the event of congestion and easy to lose the packet error. Therefore, the appropriate buffer space plus the advanced buffer scheduling algorithm is a reasonable way to solve the buffer problem. Therefore, for network backbone devices, the following points need to be noted in terms of buffer size.

(1) Whether each port has an independent buffer space, and the working state of the buffer space will not affect the state of other port buffering;

(2) Whether the module or port is designed with an independent input buffer, an independent output buffer, or an input/output buffer;

(3) Whether it has a series of buffer management scheduling algorithms, such as Red, wred, Rr/fq and WERR/WEFQ.

13. Maximum MAC Address Table size. Each port or device connected to the LAN requires a MAC address that other devices use to locate specific ports and update routing tables and data structures. The MAC address is 6 bytes long and is assigned by IEEE, also called the physical address. The MAC Address Table size of a device reflects the maximum number of nodes that can be supported by the device.

14. Maximum number of power supplies. In general, the core equipment provides a redundant power supply, after a power failure, the other power supply can continue to power, does not affect the normal operation of the equipment. When there are multiple power supplies, pay attention to the use of multi-channel mains supply, so that when the line fails, other lines can still power. A high-end LAN switch is a core device for a large network, and it must be available to ensure its availability, and therefore has power redundancy. In addition, the table-type LAN switch also provides AC power sockets and DC power sockets, the user should pay attention to DC power supply voltage is in line with your requirements.

15. Support protocols and standards. The protocol and standard content supported by LAN switch directly determines the network adaptability of LAN switch. These agreements and standards generally refer to the networking specifications and equipment standards established by the International Organization for Standardization.