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Top 5 Reasons Why Your Network Needs A Firewall

Top 5 Reasons Why Your Network Needs A Firewall

It takes a lot to truly secure a business network. If your business is notably successful, then this is doubly true. Nefarious people will want to infiltrate your tech in order to steal money or just wreak havoc. Stopping them isn’t easy, but the first step is to set up a firewall. In fact, there are five specific ways a firewall can help your business.

The First and Best Defense

It’s no secret that bad things exist within the space of the internet. Viruses, phishing software and a whole slew of things you want nowhere near your business are all lurking in dark corners of the great wide web. The primary purpose of a firewall is to defend against these threats. By monitoring both incoming and outgoing traffic through your network, the firewall can identify most threats and shut them down before and damage occurs.

With this in mind, the wavelength (or frequency) of any light source tells us the physical limitation of how we can use that light in signal processing. We can never send signals that are faster than the frequency of the beam, and we cannot use equipment that is smaller than the wavelength. This is a rough summary, but it paints a good enough picture.

Aside from the basics, the wavelength also tells us how light will interact with other objects. When it comes to designing fiber optics, those interactions are the most important pieces of information hiding within a wavelength.


When fiber optics are engineered and tested, there are two issues that can impact their effectiveness. Absorption is one of them. Materials have a natural ability to absorb electromagnetic radiation. For any given substance, only radiation of certain wavelengths can actually interact and be absorbed. When we deal with fiber optic cables, the largest source of absorption actually comes from microscopic water droplets. That drives manufacturers to avoid wavelengths where that absorption is at its worst.


Like absorption, scattering happens at different wavelengths for any given material. Also like absorption, the culprits of scattering within a fiber optic cable are small and easy to overlook. Particles of dust and even the air itself can cause scattering problems, so again, the design is to use wavelengths where these problems are smallest.

The term for signal loss related to absorption and scattering is attenuation. Engineers try to make attenuation numbers as small as possible, and when you account for both absorption and scattering at the same time, you find that very specific frequencies work best. The most common wavelengths in use today are 850, 1300, 1310 and 1500 nanometers. You’ll notice large gaps between each of those numbers. Those just happen to be the magic wavelengths where the attenuation values hit minima.

This is only the beginning. We can find that different types of fiber optic signals can further impact which wavelength is best for a function. Multimode and singlemode fiber, for instance, have different naturally-occurring sources of interference. That’s why they tend to operate with noticeably separate wavelength ranges.

Putting it all together, it isn’t necessary to optimize wavelengths when you choose fiber optic systems. That’s baked into the design. Instead, it helps to understand why wavelength is an important identifier and how emerging, more advanced systems might play with wavelength in order to improve the technology.

To order or if you have any questions, please contact one of our Network Equipment Experts today.

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