★ network cable problem
We know that twisted pairs are tightly and reasonably tightly twisted together by four pairs of wires, reducing the effects of crosstalk and background noise. At the same time, only the 1, 2, 3, and 6 wires of the twisted pair are used in the T568A standard and the T568B standard. Among them, 1,2 for sending, 3,6 for receiving, and 1,2 must come from a pair, 3,6 must come from a pair. Only in this way, crosstalk can be avoided to the maximum extent, and data transmission can be guaranteed. In practice, I found that network cables that were not produced in accordance with the correct standards (T586A, T586B) had a great potential risk. Some begin to use normally for a period of time, but after a while, performance deteriorates and the speed of the network slows down. Therefore, we are now required to press the T586A and T586B standards to suppress the network cable.
★ Circuit problem
Generally, this phenomenon rarely occurs when the number of nodes involved in the network is not large and the structure is not very complicated. However, in some complex networks, there are often redundant spare lines for some reasons, which will constitute a loop, and data packets will continuously send and verify data, which will affect the overall speed of the network and make it difficult to find. To prevent this from happening, it is required that we must develop good habits when laying network cables. The network cables should be marked clearly and the spare lines must be well documented.
★ Broadcast Storm
As the primary means of discovering unknown devices, broadcasting plays a very important role in the network. However, with the increase in the number of network computers, the number of broadcast packages will increase dramatically. When the number of broadcast packets reaches 30%, the network transmission efficiency will be significantly reduced. When a network card or network device is damaged, it will continuously send broadcast packets, which will cause a broadcast storm and make network communication paralyzed. Therefore, when the hardware of the network device is faulty, it also causes the network speed to slow down. When such a failure is suspected, hubs or switches can be replaced first to replace hub devices. Then turn off the power of the hub and use the ping command to test the computers involved one by one, find the computer with the faulty network card, and replace the new network card to restore the normal network speed.
★ Port bottleneck
In fact, the router's WAN ports and LAN ports, switch ports, hub ports, and server network cards may become network bottlenecks. We can use network management software to view the data traffic of routers, switches, and server ports during the peak period of network usage (netstat command can also count the data traffic of each port), confirm the location of network data traffic bottlenecks, and try to increase its bandwidth. For example, changing the server network card to 100M or 1000M, installing multiple network cards, and increasing the bandwidth by changing the configuration on the router can effectively alleviate network bottlenecks and maximize data transmission speed.
★ Worm virus
The impact of worms on the speed of the network is getting worse. This kind of virus causes infected users to send emails as long as they are connected to the Internet. The virus selects random files in the user's personal computer attached to the random address of the address book on the user's machine to send emails. Hundreds of these spam messages are sent out in line, and some are sent back to the server in batches. The individual backbone Internet has caused obvious congestion, and individual LANs have been rampant. Therefore, we should always pay attention to all kinds of new virus notifications, understand the characteristics of various viruses, and upgrade the anti-virus software used in time. Computers must also upgrade and install system patches in a timely manner. At the same time, unnecessary services must be uninstalled and unnecessary ports must be closed to improve system security and reliability.
In a word, the application of computer network is more and more extensive, how to improve the management level of the computer network, study ceaselessly, it is very important to pay attention to theoretical knowledge and practical experience to accumulate.
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Chemical Composition (%)
Grade
C
Mn
P
S
Si
Cr
Mo
Ni
WP5 Class 1 & Class 3
≤0.15
0.3-0.6
≤0.04
≤0.03
≤0.5
4-6
0.44-0.65
WP9 Class 1 & Class 3
≤0.15
0.3-0.6
≤0.03
≤0.03
≤1
8-10
0.9-1.1
WP11 Class 1
0.05-0.15
0.3-0.6
≤0.03
≤0.03
0.5-1
1-5
0.44-0.65
WP11 Class 2 & Class 3
0.05-0.2
0.3-0.8
≤0.04
≤0.04
0.5-1
1-5
0.44-0.65
WP12 Class 1 & Class 2
0.05-0.2
0.3-0.8
≤0.045
≤0.045
≤0.6
0.8-1.25
0.44-0.65
WP22 Class 1 & Class 3
0.05-0.15
0.3-0.6
≤0.04
≤0.04
≤0.5
1.9-2.6
0.87-1.13
WP91
0.08-0.12
0.3-0.6
≤0.02
≤0.01
0.2-0.5
8-9.5
0.85-1.05
≤0.4
WP911
0.09-0.13
0.3-0.6
≤0.02
≤0.01
0.1-0.5
8.5-10.5
0.9-1.1
≤0.4
Mechanical properties
Item
Tensile Strength (MPa)
Yield Strength (MPa)
Elongation%
WP5 Class 1
415-585
≥205
≥20
WP5 Class 3
520-690
≥310
≥20
WP9 Class 1
415-585
≥205
≥20
WP9 Class 3
520-690
≥310
≥20
WP11 Class 1
415-585
≥205
≥20
WP11 Class 2
485-655
≥275
≥20
WP11 Class 3
520-690
≥310
≥20
WP12 Class 1
415-585
≥220
≥20
WP12 Class 2
485-655
≥275
≥20
WP22 Class 1
415-585
≥205
≥20
WP22 Class 3
520-690
≥310
≥20
WP91
585-760
≥415
≥20
WP911
620-840
≥440
≥20
Alloy Cap
Alloy Cap,Pipe Cap,Seamless Cap,Steel Cap,Cap End
HEBEI HANMAC MACHINE CO., LTD. , https://www.chinahanmac.com