QoS (Quality of Service, level of service or service) is a technology for specifying service priorities for different types of traffic. That is, QoS is a technology that can guarantee the full passage of a certain type of traffic within a given technological framework.

DPI RAMP – deep traffic analysis

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The mechanism of operation

The quality of network service can be determined:

  • The data transfer rate (Bitrate). Specifies the maximum minimum channel width for data transmission. It is measured in bits per second and depends on the bandwidth.
  • The delay in the process of sending/receiving a data packet (Delay). The parameter is specified in milliseconds.
  • The number of lost packets (Packet loss). Indicates the number of packets that were lost in the process of sending/receiving them.
  • The communication channel can be described as a tube, and the bandwidth as its length and diameter. And if this pipe (communication channel) has a narrowed “neck”, then you will have to use the FIFO method (First In /First Out — first in / first out).

All packets that are not queued for FIFO transmission will be ignored by the router, which will lead to their loss. Therefore, it is more logical to use a more “advanced” type of this queue, where the priorities will depend on the specific type of service.

Working QoS models

QoS can function as:

  • Best Effort Service (non-guaranteed package delivery). It implies the usual increase in channel width. No separate traffic classes are used in the process, and no channels are allocated for this traffic.
  • IntServ is an Integrated Service. Provides the best network service by guaranteeing a certain data channel width. It uses the RSVP (Resource ReSerVation Protocol) protocol, which ensures compliance with the requirements for all infrastructure nodes.
  • DiffServ is a Differentiated Service. This is a QoS organized by allocating network resources and defining classes with restrictions on the network boundary, which are combined to provide the necessary services.

The main task of QoS is to ensure the guaranteed transmission of certain data packets unnoticed by the user. QoS can be used everywhere: at home, in the office, library, airport, etc.
Using QoS technology, you can ensure that users do not have problems downloading files, video calls, IP telephony conversations, or viewing any online documents on a local or global network.

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