QoS (Quality of Service) Overview

QoS (Quality of Service) is the general name of a concept , which is used to optimize networks with different priority levels to different applications and provide improved services for these appliations on these networks. From the view point of customer, with QoS, users get a better performance without drops, packet loss, unaccepted delays etc. From the view point of your Service Provider company, with QoS, you can use your networks more efficient. With optimized network bandwidh and with a best performance.

QoS (Quality of Service) adjusts some important QoS Enemies for the traffic mainly. With this adjustments, networks become more efficient.

These important QoS enemies are given below:

• Packet Loss
• Jitter
• Delay

So, what are these terms?

Packet Loss : Losing the packets along the path.
Delay : The time taken from one point to the other along the path.
Jitter : Variable Delay in packet transfer.

There are various types of traffics like real-time voice, data, streaming video etc. All of these traffic types need different QoS adjustments. Some of these traffics are very senstive to delay, some of them are not. Another is senstive to Packet Loss, for the other, Packet Loss is not too important.


Let’s give some examples for these different types of traffic to understand better.

As you know, voice is a real-time traffic. When you talk with another people, the vioce data is created at that time interactively by you and this traffic needs to reach to the other end in a very short time. If this is not achieved, then it is not possible to communicate with the person at the other end. So, voice traffic is senstive for delays. Beside, your voice data must not have a variable delays, jitter. Because, this also makes the communication worst. Lastly, for a good communication, your sentences need to be clear without any loss. All your talking need to be heared at the other end. This makes Voice traffic also Packet Loss senstive.

Lesson tags: QoS, Quality of service, -
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