Data Communication

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Which One Is Better: 2.4 GHz or 5 GHz?

2017-08-25 12:15:29 | Router

A young man enters a restaurant and sits at a table. The waitress comes around and he asks for the Wi-Fi password. You must be familiar with the scene. Yes, not only you and me, almost everybody seems to do so. It has become a common phenomenon that when we plan to stay for a while in a store or restaurant, the first thing we do is to ask for the Wi-Fi password. Wireless network really makes it convenient to get access to the network, because you do not need ethernet network cable. We know that wireless network utilizes either 2.4 GHz frequency band or 5 GHz frequency band. From the time perspective, 2.4 GHz band was first used in 1999 while 5 GHz band was first available in 2007. Is 5 GHz wireless network better than 2.4 GHz wireless network in all aspects? The answer is no. Keep reading and you will see why.

2.4 GHz or 5 GHz
Wi-Fi Range

We know that the Wi-Fi range refers to the coverage area of an access point’s Wi-Fi signal. The higher the frequency of a wireless signal, the smaller its range. As a result, 2.4 GHz wireless network covers a larger range than 5 GHz wireless network. And in practical applications, both 2.4 GHz and 5 GHz signals do not penetrate solid objects which limit their reach inside home. Therefore, from the perspective of the coverage area, 2.4 GHz wireless network performs better than 5 GHz wireless network.

Wi-Fi Speed

As a matter of fact, the Wi-Fi speed only partially relates to the frequency band of wireless signal. For example, the newer 802.11g network running at 2.4 GHz can offer the same maximum data rate of 54 Mbps as the old 802.11a network running at 5 GHz. Apart from this, when the electric power is maintained at a low level, 2.4 GHz wireless network is able to carry more data than 5 GHz wireless network. For example, with the use of a pair of radios instead of one and increasing capacity in the good condition, some old 2.4 GHz 802.11g network devices match and even exceed the potential speed advantage of some 5 GHz 802.11a network devices. However, for those home devices that generate or consume the largest amount of network traffic, 5 GHz band can provides faster speed.

Wi-Fi Interference

The 2.4 GHz frequency band is commonly used in consumer products while 5 GHz is not. In wireless home network, you may find that many older Wi-Fi devices do not support 5 GHz band, such as cordless phones, automatic garage door openers and other home appliances. Therefore, connecting the devices to 2.4 GHz band in any case is secure.

Cost

The 5 GHz router generally costs more than router which supports 2.4 GHz only, because 5 GHz router is comparatively new. But this does mean 5 GHz network technology is newer than 2.4 GHz. Generally speaking, both 2.4 GHz and 5 GHz have existed for a long time, but 2.4 GHz router is more common in wireless network applications.

2.4 GHz Vs. 5 GHz
Conclusion

From the above comparison, we can make a conclusion that 2.4 GHz and 5 GHz have their own advantages, or we can say that 2.4 GHz is better than 5 GHz in some aspects, such as Wi-Fi interference, Wi-Fi range and cost. In practical application, you have to make the selection according to your specific requirement. Now, on the market, dual band router is available which supports both 2.4 GHz and 5 GHz channels. FS.COM can also provide quality network patch cable and wireless access point for wireless network deployment. 


Arista DCS-7050QX-32 Vs. Arista DCS-7050QX-32S

2017-08-16 10:22:25 | Switch

The ever-growing need for higher speed data transmission has spurred the development of all kinds of network devices, such as fiber patch cables which have promoted from OM1 to OM5, and fiber optic transceivers which have evolved from SFP to QSFP28. in addition, as long as you have basic knowledge about cabling system in data centers, you are not likely to be unfamiliar with switch. Of course, switch also has been optimized its configuration and capacity over time from with only 1G SFP port for 1G network to with 40G QSFP+ port for 40G network. Nowadays, 40G network has become the mainstream in data center and switch with multiple 40G QSFP+ ports is popular with network engineer. The Arista 7050QX Series are designed for 10/40GbE network for data center and this article is going to focus on the comparison between Arista DCS-7050QX-32 and Arista DCS-7050QX-32S switch.

Overview of Arista DCS-7050QX-32 And Arista DCS-7050QX-32S

As the members of the Arista 7050QX Series, Arista DCS-7050QX-32 and Arista DCS-7050QX-32S are the key components of the Arista portfollo of data center switches. Both of them are built in compact and energy efficient form factors with wire speed layer 2 and layer 3 features, combined with advanced features for software defined cloud networking. In addition, both Arista DCS-7050QX-32 and Arista DCS-7050QX-32S are able to support a flexible combination of 10G and 40G in a highly compact form factor. Because of this feature, network engineers can design large leaf and spine networks to accommodate east-west traffic patterns found in modern data centers, high performance compute and big data environments.

Arista DCS-7050QX-32 Vs. Arista DCS-7050QX-32S

From the model name, it is not difficult to infer that there are both similarities and differences between Arista DCS-7050QX-32 and Arista DCS-7050QX-32S. The following part will focus on the similarities and differences between these two Arista switches.

Arista DCS-7050QX-32 And Arista DCS-7050QX-32S

Figure of Arista DCS-7050QX-32 and Arista DCS-7050QX-32S

Similarities
  • Both of these two switches are configured with 32 x 40GbE QSFP+ ports and 24 of them can be used with breakout cables as 4 x 10GbE. That is to say, you can set up 32 x 40GbE system or 96 x 10GbE and 8x40GbE system.
  • Both of them offer low latency from 550ns in cut-through mode.
  • Both of them can support throughput up to 2.56 terabits per second.
  • Both of them provide 12MB packet buffer pool that is allocated dynamically to ports that are congested.
  • Both them are characterized with typical power consumption of less than 5 watts per 40GbE port for lower cost of ownership. With three QSFP+ ports active using DAC cables and a fourth using a breakout cable power on a single power supply is 112W-114W once it booted which is very good.
  • They not only have the same size 48.3x 4.4x 40.64cm, but also the same weight 9.1kg.
Differences
  • In addition to 32 x 40GbE QSFP+ ports, the Arista DCS-7050QX-32S features four 10G SFP+ ports that are internally shared with the first QSFP+ port for directly connecting 10GbE and 1GbE interfaces.
  • The Arista DCS-7050QX-32 has a Dual-core x86 CPU while Arista DCS-7050QX-32S has a Quad-core x86
  • The optional SSD storage of Arista DCS-7050QX-32 is 100 Gigabytes while the SSD storage of Arista DCS-7050QX-32S is 120 Gigabytes.
  • The Arista DCS-7050QX-32 can achieve 92% efficiency power supply while the power supply efficiency of Arista DCS-7050QX-32S is 93%.
  • The Arista DCS-7050QX-32 sells for $1200-$1400 while Arista DCS-7050QX-32S sells for around $2300.
Conclusion

Combined with Arista EOS, Arista DCS-7050QX-32 and Arista DCS-7050QX-32S?can deliver advanced features for big data, cloud, virtualized and traditional designs. They can be either used with 40GBASE-SR QSFP+ and multimode fiber cable for short optical links or used with 40GBASE-LR4 QSFP+ and single mode fiber cable for long transmission distance. Besides, they can use breakout cable to achieve 40G to 10G connection. Therefore, both of them are a good selection for data center 10G and 40G network deployment. As for which one to choose, it all depends on your specific requirement. If your budget is tight, Arista DCS-7050QX-32 will be better value; if you want 10G SFP+ ports, then choose Arista DCS-7050QX-32S.