Understanding and Troubleshooting Cisco Catalyst 9800 Series Wireless Controllers
by Nicolas Darchis, Simone Arena, Francisco Sedano Crippa, Sudha Katgeri
Chapter 9
Quality of Service (QoS)
Let’s start with a simple definition: quality of service (QoS) is the measurement of the overall quality and service usability of the network. The factors that define and determine QoS are
Bandwidth (or throughput): The capacity of the network to transmit the maximum amount of data from one point to another in a given amount of time. It’s normally measured in megabits per second (Mbps) or gigabits per second (Gbps).
Packet loss: The percentage of packets that are not received (did not arrive or arrived too late and hence discarded). For voice, for example, the default G.729 codec requires packet loss far less than 1 percent to avoid audible problems.
Latency (or delay): The time it takes for a data packet ...
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