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What is QoS?

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What is QoS?

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This acronym stands for Quality of Service. Quality of Service (QoS) refers to the capability of a network to provide better service to selected network traffic over various technologies, including Ethernet, 802.1 networks and IP-routed networks that may use these underlying technologies. The primary goal of QoS is to provide priority including dedicated bandwidth, controlled jitter and latency (required by some real-time and interactive traffic), and improved loss characteristics. Also important is making sure that providing priority for one or more flows does not make other flows fail. QoS technologies provide the elemental building blocks that will be used for future business applications in campus, WAN, and service provider networks. In particular, it is critical for converged voice traffic to run over a QoS enabled network in order to deliver a business class quality voice call.

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QOS stands for Quality of Service. It consists of several parameters that control message communication behavior between the Edge Controller and the Premises server. The default configuration for the Edge Controller is QOS level: QOS 1 and QOS persistence: memory only. This means that messages, including tag reads, are assured to flow from the Edge Controller to the Premises server, except when the Edge Controller has been turned off, the Services Management Framework (SMF) runtime has been stopped during network outages, or the Premises server is down. Reasons for these default settings: • The tags must be delivered to the Premises server, regardless of the condition of the network. If the network is down, the delivery of tags must be retried until they can be delivered. • Memory-only persistence was used because space is minimal on the Edge Controller. • Storing tags in a file or database might fill up the device file system and cause operating system problems. • DB2e persistence sig

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Quality of Service. It refers to giving some network traffic higher priority. QoS is based on the fact that some traffic is more resilient. Voice traffic is not resilient because it is time sensitive. Ideally, time-sensitive traffic (like phone calls) should be given priority over less sensitive traffic (like email) to ensure the timely delivery and quality of the voice conversation. To implement QoS, you must first classify what high-priority traffic is, then handle that traffic better than the low-priority traffic. There are many companies that cannot provide QoS in their voice network. Covad does, and we do it throughout the entire network, from customer phone to our switch and onto the public switched telephone network (PSTN).

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Quality of Service or QoS is a method of providing better service for selected traffic types over various types of packet-switched networks. The network medium used could be any one of several types of technology ranging from Ethernet to Wireless and Frame Relay networks. QoS provides a method for determining which traffic should be given priority on a network segment. An example of an environment that uses QoS would be an Internet based phone system on an organization’s network. Suppose an organization creates a packet-switched network with ten computers using Ethernet as the backbone. The company then connects a router and other hardware to connect to the public Internet. QoS does not really become affected by this scenario, because all of the traffic is of primarily the same type. When the company decides to attach a new telephone system to their network using Voice Over IP technology, QoS becomes a factor. The primary function of QoS is to ensure that all technologies are getting t

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There is no common or formal definition of QoS. However, there are a number of definitions at the communication level where the notion originated to describe technical characteristics of mainly non-time-dependent data transmission. Emerging networks such as ATM, can provide QoS guarantees on bandwidth and delay for the transfer of continuous media (CM) data. • The International Telecommunication Union (ITU) standard X.902, Information technology Open distributed processing Reference Model, refers to QoS as “A set of quality requirements on the collective behavior of one or more objects.” A number of QoS parameters describe the speed and reliability of data transmission, e.g., throughput, transit delay, and error rate. • The ATM Lexicon defines QoS as “A term which refers to the set of ATM performance parameters that characterize the traffic over a given virtual connection.” QoS parameters apply mostly to lower level protocol layers, and were not meant to be directly observable or verif

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