Calrec IP Primer: Quality of Service QoS

Calrec IP Primer Part 6: Quality of Service (QoS)

Welcome to the sixth in an eight-part series of articles on AoIP!

Over the next three weeks, we will be releasing an IP chapter every Wednesday as part of Calrec’s latest IP Primer. The IP Primer will build up your knowledge of IP and will enable you to create reliable AoIP networks to meet the needs of your desired workflow without defining or compromising operations.

We’ll look at QoS, Switches and Network Design. This week we dive into Quality of Service (QoS) in more detail.

QoS covers a lot of ground, but ultimately it gives network designers a way to fine-tune their networks to better cope with unexpected demands. QoS is an umbrella term which covers a range of tools, systems, technologies and protocols to help protect the most essential traffic on a network – it provides a network-wide hierarchy which provides stability for every device on it. This chapter of Calrec’s IP Primer explains clearly what QoS is – and more importantly, what it is not.

James Tunnicliffe

US Customer Support Engineer at Calrec

Calrec IP Primer Part 6: Quality of Service (QoS)

QoS is short for ‘Quality of Service’ and covers a lot of ground – it is a blanket term for a variety of tools, systems, technologies and protocols to provide greater control over network performance.

It gives network designers the ability to mitigate potential issues by assigning priorities to certain network traffic, and it can be applied in a number of ways. However, it is not a catch-all – it does not guarantee protection against all network conditions.

If a network undergoes unexpected demands, QoS cannot guarantee that all traffic will be passed; it can only prioritise higher priority traffic. It applies a logical hierarchy to guarantee priority traffic.

In this chapter of Calrec’s IP Primer we break down QoS into the component parts which make up the full QoS feature set, from Admission Control, Classification, Marking, Traffic Policing and Shaping and Egress Queuing.

We will explain how the Differentiated Services Code Point (DSCP) is fundamental to QoS policy decisions, and how to define what those DSCP values are, and we offer some advice on how to prioritise different kinds of traffic on the same network.

Keep an eye out for other parts of this Primer over the coming weeks, and for more like this sign up to our Soundwaves Newsletter below.

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