A Closer Look at Fanless Switch

If your laptop has built-in fan, you must have gone through such experience: when your laptop has been working for a long time, it will be heating. Then, you may start the fan to cool your laptop down. However, there will be noise. So does network switch. Compared with other optical components, network switch is larger. And ongoing work will cause overheating. Therefore, many network switches are designed with fans and very noisy. Is there any solution that is the best of both worlds? The answer is “Yes”. Fanless switch can do this. This article will guide you have a closer look at fanless switch.

Overview of Fanless Switch

Taken literally, fanless switch does not have any fans built into it, thus it has a quiet operation. But how is it cooled down? In fact, engineers employ passive cooling system for fanless switch to transfer heat. The passive cooling system achieves high levels of natural convection and heat dissipation by utilizing a heat spreader or a heat sink to maximize the radiation and convection heat transfer modes. Therefore, it can provide energy efficiency and lower financial cost. With passive cooling system, fanless switch is a cost-effective and energy-efficient solution that maintains optimal operating temperature without causing much noise.


While fan switch utilizes active cooling system which refers to cooling technologies that rely on an external device to enhance heat transfer. Through active cooling system, the rate of fluid flow increases during convection, which dramatically increases the rate of heat removal. Apart from the unpleasant noise, the main disadvantage of active cooling system is that it requires larger power consumption and costs more than passive cooling system.

FS 8-Port Gigabit PoE Fanless Switch

FS 8-port Gigabit PoE fanless switch is designed with 8x 10/100/1000BASE-T RJ45 Ethernet ports, 1x console port, and 2x gigabit SFP slots. It has Layer2+ switching features and the switching capacity is 20Gbps. This 8-port fanless switch also support PoE function. It can supply power to network equipment such as weather-proof IP cameras with windshield wiper and heater, high-performance access point and IP telephone. The max power consumption of this managed PoE switch is 130W. In addition, this fanless switch has Mini body. Whether it is in the data room, office, or installed to other places, it can save you more space and make networking more convenient. To accomplish the link, you can use 100BASE SFP, 1000BASE SFP, BIDI SFP, CWDM SFP, DWDM SFP optical transceiver or 1000BASE-T SFP copper RJ-45 transceiver. FS.COM provides many high-quality compatible SFP modules for 8-port fanless switch. Here is a figure of FS 8-port Gigabit fanless switch for you.



Network switch has become an integral part of optical link, serving as the central system. But the noise is the main problem that many data center managers are faced with. To overcome this, silent fanless switch has already been available on the market. At FS.COM, small and medium-sized business can find reliable and affordable fanless switches. Like the above fanless switch, it is US $159.00. These switches are designed with high resistance to electromagnetic interference. They also features superior performance in stability, environmental adaptability. What’s more, FS.COM provides service like a one-year limited warranty, including any quality problems during the free maintenance. Besides, there are cheap and quality optical transceivers at FS.COM. And all of them are tested for 100% functionality and guaranteed compatible for outstanding network performance.

How Much Do You Know About CWDM SFP?

Have you noticed that there are some SFP modules with colorful markings on the market? For SFP, we are not unfamiliar. SFP (Small Form-Factor Pluggable) is a compact, hot-pluggable transceiver used for both telecommunication and data communication applications. But do you know why they are designed with different colors?


These colorful SFP modules are called WDM (Wavelength Division Multiplexing) SFPs. WDM is a technology which combines two or more kinds of optical signals at different wavelengths and transmits them on a single optical fiber. By using WDM technology, SFP module can transmit signals at different wavelengths, which are identified by different colors. WDM SFPs can be divided into two basic types. One is CWDM (Coarse Wavelength Division Multiplexing) SFP, and the other one is DWDM (Dense Wavelength Division Multiplexing) SFP. The following passage is mainly about CWDM SFP.

Overview of CWDM SFP

CWDM SFP is a kind of optical transceiver which uses CWDM technology. Similar with traditional SFP module, CWDM SFP is also a hot-pluggable transceiver that interfaces a network device port (of a switch, router, media converter or similar device) to a fiber optic networking cable.

Generally speaking, CWDM SFP modules come in 8 wavelengths that range from 1470 nm to 1610 nm. Through the color markings on the devices, it is easy to identify the wavelength to which the Gigabit Ethernet channel is mapped. That is why SFP modules are designed with different colors. The following table lists the CWDM SFP modules with their wavelengths and color codes.

CWDM SFPs with with their wavelengths and color codes

In addition, CWDM SFP is a compatible transceiver which provides data rates from 100 Mbps up to 4 Gbps, and reach a transmission distance at 20 to 40km, 40 to 80km and 80 to 120km. CWDM SFP modules also feature digital diagnostics, also known as digital optical monitoring (DOM), which is supported by the majority of switch and router OEMs in their operating system software.


CWDM SFP is a MSA standard build and it is designed for operations in Metro Access Rings and Point-to-Point networks using Synchronous Optical Network (SONET), SDH (Synchronous Digital Hierarchy), Gigabit Ethernet and Fiber Channel networking equipment. For it is low in cost, CWDM SFP can be regarded as a convenient and cost-effective solution for the adoption of Gigabit Ethernet and Fibre Channel (FC) in campus, data-center, and metropolitan-area access networks.

Comparison With DWDM SFP

DWDM (Dense Wavelength-Division Multiplexing) SFP transceivers are used as part of a DWDM optical network to provide high-capacity bandwidth across an optical fiber network, which is a high performance, cost effective module for serial optical data communication applications up to 4.25Gb/s. From a low cost point of view, CWDM SFP module is inexpensive than DWDM SFP. For other aspects, the key in selecting CWDM or DWDM SFP lies in the difference between CWDM and DWDM. They refer to different methods of splitting up the light. For example, CWDM uses broader spacing between channels, allowing for inexpensive SFPs, while DWDM uses denser channel spacing, which allows for more wavelengths to be used on a single fiber. DWDM is typically used in large optical networks over longer distance. Therefore, DWDM SFP module is the ideal choice for SFP modules over long distance and with better scalability.


Data communication and fiber optical network develop rapidly. During the process, some problems occur which push forward the improvement of the products. SFP modules, essentially just completed the converted of data between different media, can realize the connection between two switches or computers within a long distance. CWDM technology is an effective way to meet the rapidly increasing demand of bandwidth in transmission network, and it can provide a cost-effective solution for high capacity in metropolitan area network and local area network. As a functional and economical optical communication product, CWDM SFP, combined with the advantages of them, becomes more and more popular with users and applied to various fields.