Industrial AC machines are now more and more ubiquitous, and many relatively harsh and complicated working environments basically rely on industrial AC machines to develop data information communication networks. However, there are a lot of various industrial AC machines in the sales market, if the company assigns you to purchase a batch of AC machines, can you choose? For the purchase of industrial AC machines, it is the key to grasp the primary performance indicators of industrial AC machines. So, how to judge the performance of industrial AC machines?
1. Forwarding skills
The store-and-forward skill requires the AC to decide how to forward all the data packets after receiving them, and the Gigabit AC machine with this skill can check the integrity and correctness of the data packets before forwarding, reducing unnecessary data forwarding. Straight-through forwarding starts to forward data before the AC machine receives the entire frame, which can effectively reduce the AC latency. However, the AC machine has already started data forwarding before it has fully accepted and checked the correctness of the packets. In this way, in an environment where the quality of communication is not high, the exchange opportunity forwards all the full packets and error packets, which actually brings a lot of waste communication packets to the entire communication network. Therefore, the pass-through forwarding skill is suitable for the network environment with good network link quality and few error packets.
2. Throughput
The maximum theoretical value of Ethernet throughput is called line speed, which means that the AC machine has the ability to process data packet forwarding of various sizes at full speed, and Gigabit AC products should reach line speed.
3. Handling functions
Generally, industrial AC machine manufacturers provide handling software or third-party processing software to handle AC machines remotely. The general AC machine meets the statistical processing function of SNMP MIB IMIB II, while the more chaotic Gigabit AC machine supports the RMON automatic monitoring function by adding a built-in RMON group. Some industrial AC machines also allow an external RMON to monitor the network status of the optional port.
4. Time delay
Gigabit AC machines with pass-through forwarding technology have a fixed delay, because pass-through AC machines only determine the forwarding direction based on the destination address regardless of the overall size of the packet. An AC machine means "switch" and is a network device used for the forwarding of electrical (optical) signals. It can provide exclusive electrical signal paths for the two network nodes connected to the AC. So, its delay is fixed. Because the AC machine that chooses the store-and-forward skill must accept the complete data packet before it starts to forward, the large data packet will have a large delay; If the packet is small, the delay is small.
5. Single and multiple MAC address types
Single-MAC AC machines are primarily designed to connect end users, network shared resources, or non-bridged routers, and they cannot be used to connect hubs or network segments with multiple network devices. A multi-MAC AC machine has a memory body that satisfies multiple hardware addresses on each port. Each port of a multi-MAC AC machine can be seen as a hub, and the entire AC machine can be seen as a hub of hubs.
6. Full duplex
The full-duplex port is capable of sending and receiving data at the same time, and AC machines with full-duplex functionality can achieve twice the throughput of simplex mode communication, and avoid collisions between data sending and ingestion. An AC machine means "switch" and is a network device used for the forwarding of electrical (optical) signals. It can provide exclusive electrical signal paths for the two network nodes connected to the AC.
7. Whether VLANs can be supported
By dividing the LAN into virtual network VLAN network segments, network management and network security can be strengthened, and unnecessary data transmission can be controlled. In a virtual network, a broadcast domain can be a virtual network segment consisting of a set of arbitrarily selected MAC addresses. In this way, in-network working groups can break the geographical constraints in the shared network and divide them according to their functions.
8. Link aggregation
Link aggregation can make the link bandwidth between AC machines and between AC machines and servers have very good scalability, for example, 2, 3, and 4 Gigabit links can be bound together, so that the bandwidth of the link can be doubled. The link aggregation skill can implement load balancing on different ports, and can also back up each other to ensure the redundancy of links. In these Gigabit AC machines, up to 4 groups of link aggregation can be supported, with a maximum of 4 ports in each group. In general, link aggregation is not allowed to be set up across chips. Both spanning tree protocol and link aggregation can ensure the redundancy of a network. Setting redundant links in a network and clogging the backup links with spanning tree protocol does not logically form a loop. In the event of a failure, the backup link is enabled.
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