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Quality of service

Index Quality of service

Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network or a cloud computing service, particularly the performance seen by the users of the network. [1]

139 relations: Abilene Network, Admission control, Apache HTTP Server, Application service architecture, Asymmetric digital subscriber line, Asynchronous transfer mode, Audio over Ethernet, Audio over IP, Audio Video Bridging, Autonomous system (Internet), Availability, Bandwidth (computing), Base station, Best-effort delivery, Bit error rate, Bit rate, Bob Braden, BSSGP, Bufferbloat, Circuit emulation service, Circuit switching, Cisco IOS, Cisco Systems, Class of service, Clearing (telecommunications), Cloud computing, Computer History Museum, Computer network, Crosstalk, Data link layer, Deep packet inspection, Differentiated services, E-commerce, End-to-end principle, Erlang (unit), Ethernet, EtherNet/IP, Fair queuing, Fibre Channel over Ethernet, Flat rate, Frame Relay, G.hn, Grade of service, GSM, Handover, Henning Schulzrinne, HomePNA, I2P, IEEE 802.11e-2005, IEEE 802.1Q, ..., IEEE P802.1p, Independent Computing Architecture, Industrial control system, Integrated services, International Telecommunication Union, Internet, Internet Control Message Protocol, Internet Engineering Task Force, Internet2, IPTV, IPv4, ISCSI, Isochronous signal, ITU-T, Jitter, Lag, Latency (engineering), LEDBAT, Linux, Low-latency queuing, Mean opinion score, Mebibyte, Medium access control, Micro Transport Protocol, Mobile QoS, Mobility management, Mod qos, Multiplayer video game, Multiprotocol Label Switching, Net neutrality, Network congestion, Network delay, Network planning and design, Network scheduler, Network service provider, Network switch, Next Steps in Signaling, Online game, Open Garden, Operations support system, OSI model, Packet delay variation, Packet loss, Packet switching, Perceptual Evaluation of Video Quality, Predictability, PSQM, Public switched telephone network, QPPB, Quality of experience, Radio resource management, Remote Desktop Protocol, Remote surgery, Request for Comments, Resource Reservation Protocol, Router (computing), RSVP-TE, Safety-critical system, Scheduling (computing), Series of tubes, Service-level agreement, Session Initiation Protocol, Starvation (computer science), Stochastic, Streaming media, Strong cryptography, Subjective video quality, Telephony, Telepresence, Teletraffic engineering, Throughput, Tiered Internet service, TM Forum, Traffic classification, Traffic contract, Traffic flow (computer networking), Traffic shaping, Transmission Control Protocol, Transmission delay, Transport Layer Security, Type of service, Unique selling proposition, United States Senate Committee on Commerce, Science, and Transportation, Video on demand, Videotelephony, Virtual LAN, Virtual private network, Voice over IP, X.25. Expand index (89 more) »

Abilene Network

Abilene Network was a high-performance backbone network created by the Internet2 community in the late 1990s.

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Admission control

Admission control is a validation process in communication systems where a check is performed before a connection is established to see if current resources are sufficient for the proposed connection.

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Apache HTTP Server

The Apache HTTP Server, colloquially called Apache, is a free and open-source cross-platform web server, released under the terms of Apache License 2.0.

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Application service architecture

Application service architecture (ASA) is an emerging discipline within IT that involves a top down approach to monitoring, controlling, securing, and optimizing applications in transit.

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Asymmetric digital subscriber line

Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide.

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Asynchronous transfer mode

Asynchronous transfer mode (ATM) is, according to the ATM Forum, "a telecommunications concept defined by ANSI and ITU (formerly CCITT) standards for carriage of a complete range of user traffic, including voice, data, and video signals".

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Audio over Ethernet

In audio and broadcast engineering, Audio over Ethernet (sometimes AoE—not to be confused with ATA over Ethernet) is the use of an Ethernet-based network to distribute real-time digital audio.

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Audio over IP

Audio over IP (AoIP) is the distribution of digital audio across an IP network such as the Internet.

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Audio Video Bridging

Audio Video Bridging (AVB) is a common name for the set of technical standards developed by the Institute of Electrical and Electronics Engineers (IEEE) Audio Video Bridging Task Group of the IEEE 802.1 standards committee.

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Autonomous system (Internet)

Within the Internet, an autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators on behalf of a single administrative entity or domain that presents a common, clearly defined routing policy to the Internet.

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In reliability theory and reliability engineering, the term availability has the following meanings.

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Bandwidth (computing)

In computing, bandwidth is the maximum rate of data transfer across a given path.

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Base station

Base station (or base radio station) is – according to the International Telecommunication Union's (ITU) Radio Regulations (RR) – a "land station in the land mobile service." The term is used in the context of mobile telephony, wireless computer networking and other wireless communications and in land surveying.

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Best-effort delivery

Best-effort delivery describes a network service in which the network does not provide any guarantee that data is delivered or that delivery meets any quality of service.

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Bit error rate

In digital transmission, the number of bit errors is the number of received bits of a data stream over a communication channel that have been altered due to noise, interference, distortion or bit synchronization errors.

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Bit rate

In telecommunications and computing, bit rate (bitrate or as a variable R) is the number of bits that are conveyed or processed per unit of time.

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Bob Braden

Robert Braden (28 January 1934 – 15 April 2018) was an American computer scientist who played a role in the development of the Internet.

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BSSGP is a protocol used in the GPRS mobile packet data system.

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Bufferbloat is a cause of high latency in packet-switched networks caused by excess buffering of packets. Bufferbloat can also cause packet delay variation (also known as jitter), as well as reduce the overall network throughput.

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Circuit emulation service

Circuit emulation service (CES) is a telecommunication technology used to send information over asynchronous data networks like ATM, ethernet or MPLS, so that it is received error-free with constant delay, similar to a leased line.

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Circuit switching

Circuit switching is a method of implementing a telecommunications network in which two network nodes establish a dedicated communications channel (circuit) through the network before the nodes may communicate.

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Cisco IOS

Cisco IOS (originally Internetwork Operating System) is a family of software used on most Cisco Systems routers and current Cisco network switches.

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Cisco Systems

Cisco Systems, Inc. is an American multinational technology conglomerate headquartered in San Jose, California, in the center of Silicon Valley, that develops, manufactures and sells networking hardware, telecommunications equipment and other high-technology services and products.

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Class of service

Class of service is a parameter used in data and voice protocols to differentiate the types of payloads contained in the packet being transmitted.

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Clearing (telecommunications)

Clearing, in telecommunications means.

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Cloud computing

Cloud computing is an information technology (IT) paradigm that enables ubiquitous access to shared pools of configurable system resources and higher-level services that can be rapidly provisioned with minimal management effort, often over the Internet.

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Computer History Museum

The Computer History Museum (CHM) is a museum established in 1996 in Mountain View, California, US.

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Computer network

A computer network, or data network, is a digital telecommunications network which allows nodes to share resources.

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In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

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Data link layer

The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking.

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Deep packet inspection

Deep packet inspection is a type of data processing that inspects in detail the data being sent over a computer network, and usually takes action by blocking, re-routing, or logging it accordingly.

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Differentiated services

Differentiated services or DiffServ is a computer networking architecture that specifies a simple and scalable mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks.

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E-commerce is the activity of buying or selling of products on online services or over the Internet.

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End-to-end principle

The end-to-end principle is a design framework in computer networking.

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Erlang (unit)

The erlang (symbol E) is a dimensionless unit that is used in telephony as a measure of offered load or carried load on service-providing elements such as telephone circuits or telephone switching equipment.

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Ethernet is a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN).

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EtherNet/IP is an industrial network protocol that adapts the Common Industrial Protocol to standard Ethernet.

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Fair queuing

Fair queuing is a family of scheduling algorithms used in some process and network schedulers.

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Fibre Channel over Ethernet

Fibre Channel over Ethernet (FCoE) is a computer network technology that encapsulates Fibre Channel frames over Ethernet networks.

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Flat rate

A flat fee, also referred to as a flat rate or a linear rate, refers to a pricing structure that charges a single fixed fee for a service, regardless of usage.

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Frame Relay

Frame Relay is a standardized wide area network technology that specifies the physical and data link layers of digital telecommunications channels using a packet switching methodology.

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G.hn is a specification for home networking with data rates up to 2 Gbit/s and operation over four types of legacy wires: telephone wiring, coaxial cables, power lines and plastic optical fiber.

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Grade of service

In telecommunication engineering, and in particular teletraffic engineering, the quality of voice service is specified by two measures: the grade of service (GoS) and the quality of service (QoS).

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GSM (Global System for Mobile communications) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation digital cellular networks used by mobile devices such as tablets, first deployed in Finland in December 1991.

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In cellular telecommunications, the terms handover or handoff refer to the process of transferring an ongoing call or data session from one channel connected to the core network to another channel.

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Henning Schulzrinne

Henning Schulzrinne was the Chief Technology Officer (CTO) for the United States Federal Communications Commission, having been appointed to that role on December 19, 2011 to 2014 Previously he was chair and Julian Clarence Levi Professor of the Computer Science department at Columbia University.

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The HomePNA Alliance is an incorporated non-profit industry association of companies that develops and standardizes technology for home networking over the existing coaxial cables and telephone wiring within homes, so new wires do not need to be installed.

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The Invisible Internet Project (I2P) is an anonymous network layer that allows for censorship-resistant, peer to peer communication.

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IEEE 802.11e-2005

IEEE 802.11e-2005 or 802.11e is an approved amendment to the IEEE 802.11 standard that defines a set of quality of service (QoS) enhancements for wireless LAN applications through modifications to the Media Access Control (MAC) layer.

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IEEE 802.1Q

802.1Q, often referred to as Dot1q, is the networking standard that supports virtual LANs (VLANs) on an IEEE 802.3 Ethernet network.

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IEEE P802.1p

IEEE P802.1p is the name of a task group active from 1995 to 1998 and responsible for adding traffic class expediting and dynamic multicast filtering to the IEEE 802.1D standard.

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Independent Computing Architecture

Independent Computing Architecture (ICA) is a proprietary protocol for an application server system, designed by Citrix Systems.

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Industrial control system

Industrial control system (ICS) is a general term that encompasses several types of control systems and associated instrumentation used for industrial process control.

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Integrated services

In computer networking, IntServ or integrated services is an architecture that specifies the elements to guarantee quality of service (QoS) on networks.

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International Telecommunication Union

The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.

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The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.

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Internet Control Message Protocol

The Internet Control Message Protocol (ICMP) is a supporting protocol in the Internet protocol suite.

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Internet Engineering Task Force

The Internet Engineering Task Force (IETF) develops and promotes voluntary Internet standards, in particular the standards that comprise the Internet protocol suite (TCP/IP).

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Internet2 is a not-for-profit United States computer networking consortium led by members from the research and education communities, industry, and government.

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Internet Protocol television (IPTV) is the delivery of television content over Internet Protocol (IP) networks.

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Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP).

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In computing, iSCSI is an acronym for Internet Small Computer Systems Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities.

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Isochronous signal

In telecommunication, an isochronous signal is a signal in which the time interval separating any two significant instants is equal to the unit interval or a multiple of the unit interval.

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The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.

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In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal.

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In online gaming, lag is a noticeable delay between the action of players and the reaction of the server in a video game.

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Latency (engineering)

Latency is a time interval between the stimulation and response, or, from a more general point of view, a time delay between the cause and the effect of some physical change in the system being observed.

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Low Extra Delay Background Transport (LEDBAT) is a way to transfer data on the Internet quickly without clogging the network.

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Linux is a family of free and open-source software operating systems built around the Linux kernel.

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Low-latency queuing

Low-latency queuing (LLQ) is a feature developed by Cisco to bring strict priority queuing (PQ) to class-based weighted fair queuing (CBWFQ).

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Mean opinion score

Mean opinion score (MOS) is a measure used in the domain of Quality of Experience and telecommunications engineering, representing overall quality of a stimulus or system.

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The mebibyte is a multiple of the unit byte for digital information.

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Medium access control

In IEEE 802 LAN/MAN standards, the medium access control (MAC) sublayer (also known as the media access control sublayer) and the logical link control (LLC) sublayer together make up the data link layer.

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Micro Transport Protocol

Micro Transport Protocol or µTP (sometimes also uTP) is an open UDP-based variant of the BitTorrent peer-to-peer file sharing protocol intended to mitigate poor latency and other congestion control issues found in conventional BitTorrent over TCP, while providing reliable, ordered delivery.

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Mobile QoS

Quality of service (QoS) mechanism controls the performance, reliability and usability of a telecommunications service.

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Mobility management

Mobility management is one of the major functions of a GSM or a UMTS network that allows mobile phones to work.

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Mod qos

mod_qos is a quality of service (QoS) module for the Apache HTTP server implementing control mechanisms that can provide different priority to different requests.

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Multiplayer video game

A multiplayer video game is a video game in which more than one person can play in the same game environment at the same time, either locally or over the internet.

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Multiprotocol Label Switching

Multiprotocol Label Switching (MPLS) is a type of data-carrying technique for high-performance telecommunications networks. MPLS directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table.

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Net neutrality

Net neutrality is the principle that Internet service providers treat all data on the Internet equally, and not discriminate or charge differently by user, content, website, platform, application, type of attached equipment, or method of communication.

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Network congestion

Network congestion in data networking and queueing theory is the reduced quality of service that occurs when a network node or link is carrying more data than it can handle.

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Network delay

Network delay is an important design and performance characteristic of a computer network or telecommunications network.

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Network planning and design

Network planning and design is an iterative process, encompassing topological design, network-synthesis, and network-realization, and is aimed at ensuring that a new telecommunications network or service meets the needs of the subscriber and operator.

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Network scheduler

A network scheduler, also called packet scheduler, queueing discipline, qdisc or queueing algorithm, is an arbiter on a node in packet switching communication network.

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Network service provider

A network service provider (NSP) is a business or organization that sells bandwidth or network access by providing direct Internet backbone access to internet service providers and usually access to its network access points (NAPs).

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Network switch

A network switch (also called switching hub, bridging hub, officially MAC bridge) is a computer networking device that connects devices together on a computer network by using packet switching to receive, process, and forward data to the destination device.

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Next Steps in Signaling

Next Steps in Signaling (NSIS) was an Internet Engineering Task Force working group focusing on the design of a next generation signaling protocol framework and protocol specifications.

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Online game

An online game is a video game that is either partially or primarily played through the Internet or any other computer network available.

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Open Garden

Open Garden, Inc. is an American company based in San Francisco, California, that develops a free, closed source mobile application called FireChat that enables peer-to-peer mobile Internet connection sharing with faster and more efficient data transmissions by automatically and actively choosing and switching to the best available network without requiring users to manually sift through available networks to find the best one available.

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Operations support system

Operations support systems (OSS), or operational support systems in British usage, are computer systems used by telecommunications service providers to manage their networks (e.g., telephone networks).

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OSI model

The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology.

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Packet delay variation

In computer networking, packet delay variation (PDV) is the difference in end-to-end one-way delay between selected packets in a flow with any lost packets being ignored.

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Packet loss

Packet loss occurs when one or more packets of data travelling across a computer network fail to reach their destination.

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Packet switching

Packet switching is a method of grouping data which is transmitted over a digital network into packets which are made of a header and a payload.

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Perceptual Evaluation of Video Quality

PEVQ (Perceptual Evaluation of Video Quality) is an end-to-end (E2E) measurement algorithm to score the picture quality of a video presentation by means of a 5-point mean opinion score (MOS).

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Predictability is the degree to which a correct prediction or forecast of a system's state can be made either qualitatively or quantitatively.

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PSQM (Perceptual Speech Quality Measure) is a computational and modeling algorithm defined in ITU Recommendation ITU-T P.861 that objectively evaluates and quantifies voice quality of voice-band (300 – 3400 Hz) speech codecs.

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Public switched telephone network

The public switched telephone network (PSTN) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication.

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The QoS Policy Propagation via BGP, often abbreviated to QPPB, is a mechanism that allows propagation of quality of service (QoS) policy and classification by the sending party based on access lists, community lists and autonomous system paths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of source address.

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Quality of experience

Quality of Experience (QoE, less frequently QoX or QX) is a measure of the delight or annoyance of a customer's experiences with a service (e.g., web browsing, phone call, TV broadcast).

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Radio resource management

Radio resource management (RRM) is the system level management of co-channel interference, radio resources, and other radio transmission characteristics in wireless communication systems, for example cellular networks, wireless local area networks and wireless sensor systems.

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Remote Desktop Protocol

Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft, which provides a user with a graphical interface to connect to another computer over a network connection.

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Remote surgery

Remote surgery (also known as telesurgery) is the ability for a doctor to perform surgery on a patient even though they are not physically in the same location.

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Request for Comments

In information and communications technology, a Request for Comments (RFC) is a type of publication from the technology community.

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Resource Reservation Protocol

The Resource Reservation Protocol (RSVP) is a transport layer protocol designed to reserve resources across a network for quality of service (QoS) using the integrated services model.

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Router (computing)

A router is a networking device that forwards data packets between computer networks.

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Resource Reservation Protocol - Traffic Engineering is an extension of the Resource Reservation Protocol (RSVP) for traffic engineering.

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Safety-critical system

A safety-critical system or life-critical system is a system whose failure or malfunction may result in one (or more) of the following outcomes.

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Scheduling (computing)

In computing, scheduling is the method by which work specified by some means is assigned to resources that complete the work.

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Series of tubes

"A series of tubes" is a phrase coined originally as an analogy by then-United States Senator Ted Stevens (R-Alaska) to describe the Internet in the context of opposing network neutrality.

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Service-level agreement

A service-level agreement (SLA) is a commitment between a service provider and a client.

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Session Initiation Protocol

The Session Initiation Protocol (SIP) is a communications protocol for signaling and controlling multimedia communication sessions in applications of Internet telephony for voice and video calls, in private IP telephone systems, as well as in instant messaging over Internet Protocol (IP) networks.

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Starvation (computer science)

In computer science, starvation is a problem encountered in concurrent computing where a process is perpetually denied necessary resources to process its work.

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The word stochastic is an adjective in English that describes something that was randomly determined.

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Streaming media

Streaming media is multimedia that is constantly received by and presented to an end-user while being delivered by a provider.

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Strong cryptography

Strong cryptography or cryptographic-ally strong are general terms applied to cryptographic systems or components that are considered highly resistant to cryptanalysis.

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Subjective video quality

Subjective video quality is video quality as experienced by humans.

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Telephony is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties.

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Telepresence refers to a set of technologies which allow a person to feel as if they were present, to give the appearance of being present, or to have an effect, via telerobotics, at a place other than their true location.

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Teletraffic engineering

Telecommunications traffic engineering, teletraffic engineering, or traffic engineering is the application of traffic engineering theory to telecommunications.

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In general terms, throughput is the maximum rate of production or the maximum rate at which something can be processed.

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Tiered Internet service

Tiered service structures allow users to select from a small set of tiers at progressively increasing price points to receive the product or products best suited to their needs.

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TM Forum

TM Forum is a non-profit industry association for service providers and their suppliers in the telecommunications industry.

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Traffic classification

Traffic classification is an automated process which categorises computer network traffic according to various parameters (for example, based on port number or protocol) into a number of traffic classes.

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Traffic contract

If a service (or application) wishes to use a broadband network (an ATM network in particular) to transport a particular kind of traffic, it must first inform the network about what kind of traffic is to be transported, and the performance requirements of that traffic.

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Traffic flow (computer networking)

In packet switching networks, traffic flow, packet flow or network flow is a sequence of packets from a source computer to a destination, which may be another host, a multicast group, or a broadcast domain.

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Traffic shaping

Traffic shaping is a bandwidth management technique used on computer networks which delays some or all datagrams to bring them into compliance with a desired traffic profile.

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Transmission Control Protocol

The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite.

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Transmission delay

In a network based on packet switching, transmission delay (or store-and-forward delay, also known as packetization delay) is the amount of time required to push all the packet's bits into the wire.

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Transport Layer Security

Transport Layer Security (TLS) – and its predecessor, Secure Sockets Layer (SSL), which is now deprecated by the Internet Engineering Task Force (IETF) – are cryptographic protocols that provide communications security over a computer network.

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Type of service

The type of service (ToS) field in the IPv4 header has had various purposes over the years, and has been defined in different ways by five RFCs.

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Unique selling proposition

The unique selling proposition (USP) or unique selling point is a marketing concept first proposed as a theory to explain a pattern in successful advertising campaigns of the early 1940s.

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United States Senate Committee on Commerce, Science, and Transportation

The United States Senate Committee on Commerce, Science, and Transportation is a standing committee of the United States Senate.

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Video on demand

Video on demand is a programming system which allows users to select and watch/listen to video or audio content such as movies and TV shows whenever they choose, rather than at a scheduled broadcast time, the method that prevailed with over-the-air programming during the 20th century.

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Videotelephony comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time.

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Virtual LAN

A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2).

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Virtual private network

A virtual private network (VPN) extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.

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Voice over IP

Voice over Internet Protocol (also voice over IP, VoIP or IP telephony) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.

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X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication.

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Kwoss, Quality of Service, Quality service, Quality-of-service, Telephony quality of service, Teletraffic quality of service.


[1] https://en.wikipedia.org/wiki/Quality_of_service

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