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Topic: QoS

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	RFC 2990 (rfc2990) - Next Steps for the IP QoS Architecture
		QoS architectures add a somewhat different constraint, in that the network is placed in an active role within the task of resource allocation and service delivery, rather than being a passive object that requires end systems to adapt.
		QoS signaling protocols which are intended to undertake resource management and admission control require the use of identity authentication and integrity protection in order to mitigate this potential for theft of resources.
		Both forms of QoS architecture require the internal elements of the network to be able to undertake classification of traffic based on some form of identification that is carried in the packet header in the clear.
	www.faqs.org /rfcs/rfc2990.html (8004 words)

	Quality of service - Wikipedia, the free encyclopedia
		In the field of telephony, telephony quality of service QoS was defined by the ITU as the cumulative effect on subscriber satisfaction of all imperfections affecting a telephone conversation.
		QoS skeptics further point out that if you are dropping many packets on elastic low-QoS connections, you are already dangerously close to the point of congestion collapse on your inelastic high-QoS applications, without any way of further dropping traffic without violating traffic contracts.
		QoS contracts limit traffic that can be offered to the Internet and thereby enforce traffic shaping that can prevent it from becoming overloaded, hence they're an indispensable part of the Internet's ability to handle a mix of real-time and non-real-time traffic without meltdown.
	en.wikipedia.org /wiki/Quality_of_service (1607 words)

	IP QoS Page
		QoS provisioning in the internet using IP has been a topic of active research in the last few years.
		An API was developed to use the QoS support in Linux.
		The current QoS support does not have an API, that is, there is no way to associate a socket with a queuing discipline.
	qos.ittc.ku.edu (552 words)

	CommsDesign - Delivering QoS in Home IP Networks (Site not responding. Last check: 2007-10-19)
		QoS media access is the process of determining when a packet may be transmitted from one device into a network so as not to preclude the timely transmission of a packet on the media by another device.
		QoS packet forwarding is the process of transmitting packets that have arrived from one or more network interfaces within a single device according to set of rules that provide QoS.
		QoS management server: This CQP functionality is responsible for maintaining a repository of QoS priority characteristics for various devices and applications within the home network and also for communication of these characteristics to these devices and applications.
	www.commsdesign.com /design_corner/showArticle.jhtml?articleID=18100157 (3103 words)

	ITworld.com - Say what? QoS in English
		QoS is a way to allocate resources in switches and routers so data gets to its destination quickly, consistently and reliably.
		QoS is guaranteed unless the data in a queue exceeds the amount of reserved bandwidth.
		QoS is too costly and complex to implement everywhere, and even the most robust QoS capabilities can't overcome poor network design.
	www.itworld.com /Net/4009/NWW980817QoS (2289 words)

	Quality of Service
		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 verifiable by the application.
		Incorporating QoS monitoring and adaptation mechanisms within an architecture that provides end-to-end QoS is reported in their paper Meeting QOS Guarantees by End-to-End QoS Monitoring and Adaptation.
		QoS requirements are expressed as benefit functions which specify the benefit to the user or the system of attaining a given QoS level.
	www.objs.com /survey/QoS.htm (2513 words)

	Application-Level QoS (Site not responding. Last check: 2007-10-19)
		QoS results from the interaction of user demands, system behavior under these demands, and the resources the behavior requires.
		QoS design-in methods are a risk-reduction technique based on either modeling the application, as with software performance engineering (SPE), or on the use of well-understood components, as in prediction-enabled component technology (PECT).
		The proposed approach is based on a reputation mechanism in which nodes with higher reputations are more likely to have their requests served, whereas those with lower reputations have a lower probability of obtaining overlay resources.
	dsonline.computer.org /portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline/2006/06&file=w3gei.xml&xsl=article.xsl& (1467 words)

	Configuring Enhanced Quality of Service (Site not responding. Last check: 2007-10-19)
		Enabling advanced ToS-based QoS on an interface allows you to specify the trust level and packet marking used for packets received on that interface.
		When ToS-based QoS is disabled, a packet's priority can be changed only by directly resetting its internal forwarding priority as it travels through the system or by using an ACL to explicitly change the priority.
		The trusted QoS source (CoS, IP Precedence, or DSCP) is mapped to a DSCP value and the packet is marked with that DSCP value.
	www.foundrynet.com /services/documentation/ecmg/QoS-JetCore.html (3585 words)

	QOS/Policy/Constraint Based Routing
		After that, several types of QoS based routing algorithms are compared, and the advantages and disadvantages of each type discussed.
		In other words, QoS is a measurable level of service delivered to network users, which can be characterized by packet loss probability, available bandwidth, end-to-end delay, etc. Such QoS can be provided by network service providers in terms of some agreement(Service Level Agreement, or SLA) between network users and service providers.
		Provisioned QoS is usually provided by statically configuring the network resources, which in turn produces some QoS treatment for certain traffic.
	www.cse.wustl.edu /~jain/cis788-99/ftp/qos_routing (7944 words)

	Quality of Service
		Quality of Service (QoS) is a set of technologies for managing network traffic in a cost effective manner to enhance user experiences for home and enterprise environments.
		QoS technologies allow you to measure bandwidth, detect changing network conditions (such as congestion or availability of bandwidth), and prioritize or throttle traffic.
		For example, QoS technologies can be applied to prioritize traffic for latency-sensitive applications (such as voice or video) and to control the impact of latency-insensitive traffic (such as bulk data transfers).
	www.microsoft.com /technet/network/qos/default.mspx (386 words)

	Billion.com ::::: Powering Communications with Security
		Employed on DiffServ (Differentiated Services) architecture for QoS guarantee, the traffic of data is given priority by the router, ensuring latency-sensitive application like voice, or even mission-critical files as VPN, move through the router at lightning speed, even under heavy load.
		In addition, Billion's routers with QoS are also ideal for small businesses using an office server as a webserver.
		With QoS control, webpages served to your customers can be given top priority and delivered first, whilst still allowing email and office web browsing - at a speed which won't impede webserving.
	www.billion.com /edu/qos.htm (468 words)

	Path QoS Collection for Stable Hop-by-Hop QoS Routing
		RSVP is a protocol that installs a QoS requirement on routers to reserve network resources for a flow from sender to receivers.
		QOSPF [4] is a proposed QoS routing protocol that extends OSPF and MOSPF to notify QoS link states to all routers.
		One solution is explicit routing [4], which computes the route for the desired QoS in advance and sends it to other routers; that is, QOSPF uses source routing to indicate the route.
	www.isoc.org /inet97/proceedings/F4/F4_2.HTM (2671 words)

	Check Point Software: FloodGate-1 - Selecting a Quality of Service Solution
		Because standalone QoS devices suffer from challenges that relate to the placement of the QoS device relative to the VPN/Firewall, integrated solutions are the only option for secure network environments.
		This is because the QoS device attempts to manage Internet link's total available bandwidth (45Mbps), but VPN overhead causes the actual traffic load to grow beyond 45 Mbps.
		QoS devices should NEVER block connections by denying bandwidth.
	www.checkpoint.com /products/floodgate-1/floodgate-1_selectingqos.html (1284 words)

	QoS Labs (Site not responding. Last check: 2007-10-19)
		It is important to establish efficient qos protocols between networks and servers for network and computer management, according to the established level of service, adapting to the true conditions of the server and network, which are continuously changing.
		In fact, all protocols of access, security and qos must interoperate naturally with a virtual private environment (VPE) to establish qos applications through the server and the network.
		Technologies of qos allow regaining the same control that existed in the environments centered/focused on the applications, as in a mainframe (like everything was being processed in one computer).
	www.qoslabs.com /wb2/QoS_Labs/QoS__QoS (660 words)

	Inter-Domain QoS Provisioning and Accounting
		Figure 4 shows the interdomain QoS provisioning policy framework, which is applied to the interdomain policy framework shown in figure 3.
		Because all PSs that execute QoS provisioning and accounting connect with the SPS directly, scalability and flexibility are sacrificed.
		Next, the destination PS (PSc) investigates whether QoS provisioning is or is not available in the domain, and sends a Report State (RPT (Installed/Not Installed)) message that includes its reply (accept negotiation or not) to the source PS (PSa).
	www.isoc.org /inet2000/cdproceedings/1h/1h_3.htm (3820 words)

	QoS Networking, Inc. (Site not responding. Last check: 2007-10-19)
		QoS in Australia: Founder/CEO Brad Wilson is a keynote speaker presenting at the Compuware Vantage User Conference in Queensland, Australia.
		QoS has partnered with Compuware to provide the most comprehensive services in application quality and performance.
		QoS has supported some of the most critical networks in New York, and we are developing new partnerships to serve worldwide customers.
	www.qosnetworking.com /default.htm (118 words)

	QoS and SuperJANET, UKERNA
		Quality of Service (QoS) is a technology that counters the effects of congestion and queues in packet-switched networks, at the same time keeping the advantages of those networks such as high throughput and dynamic re-allocation of bandwidth between users.
		QoS divides network traffic into different classes during periods of congestion, and processes those classes in different ways depending upon their characteristics.
		The JANET QoS Development Project began in 2002 with the goal of assessing the benefits of QoS on JANET in a multi-domain and multi-vendor environment for a range of production applications.
	www.ja.net /development/qos (388 words)

	Quality of Service (QoS)
		Coexistence of mission-critical applications—Cisco's QoS technologies make certain that your WAN is used efficiently by mission-critical applications that are most important to your business, that bandwidth and minimum delays required by time-sensitive multimedia and voice applications are available, and that other applications using the link get their fair service without interfering with mission-critical traffic.
		Because PQ and CQ are placed on routers on a hop-by-hop basis (that is, priority settings for QoS pertain only to that router and are not passed to subsequent router hops in the network), identification of the packet is used only within a single router.
		Hosts and routers use RSVP to deliver QoS requests to the routers along the paths of the data stream and to maintain router and host state to provide the requested service, usually bandwidth and latency.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/qos.htm (10554 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		QoS functionality has actually been available in the Linux kernel for several years.
		But unfortunately, Linux QoS never really caught on, primarily because the Linux QoS tools were almost completely undocumented and thus unusable by all but a select few.
		My personal QoS scavenger hunt was a frustrating and disappointing experience when my completed QoS scripts didn't deliver the results I was expecting.
	www.intel.com /cd/ids/developer/asmo-na/eng/20567.htm?page=2 (375 words)

	Winsock 2: QoS API Fine-Tunes Networked App Throughput and Reliability -- MSDN Magazine, April 2001
		QoS functionality is obtained by cooperation among applications, end hosts (PCs, servers, and so on), switches, routers, and wide area network (WAN) links through which data must pass.
		Now that you have created the QoS socket, the next step is to understand how to use the QOS and FLOWSPEC structures to specify the traffic requirements for your application.
		Next, the QoS Packet Scheduler (QoS PS) performs traffic policing on the sending traffic against the SendingFlowspec, does Diffserv code point (DSCP) and/or 8021.p marking on the conformant traffic according to its service type and its DCLASS object, and then submits the packets to the NIC driver to be sent on the wire.
	msdn.microsoft.com /msdnmag/issues/01/04/QOS (5668 words)

	Kentrox - Q1300 QoS Appliance
		QoS can be difficult to set up in routers and bandwidth management devices.
		The Kentrox QoS appliance is designed to simplify installation with an intuitive graphical user interface (GUI), making it faster and easier for installers to get the system up and running (Figure 3).
		QoS reports validate traffic by traffic class, so you are ensured that the proper prioritization is occurring to and from the network.
	www.kentrox.com /products/q1300 (941 words)

	Windows XP Quality of Service (QoS) enhancements and behavior
		Networking Quality of Service (QoS) refers to a variety of techniques that prioritize one type of traffic or program that operates across a network connection instead of relying only on "best effort" connectivity.
		QoS mechanisms are built into both Microsoft Windows 2000 and Windows XP.
		When one network is connected to another network through a slow link or connection, such as a dial-up line, a situation can exist that will increase the delay of traffic that is traversing the slow link.
	support.microsoft.com /kb/316666 (918 words)

	QoS Management - NetScout Systems: Technology Solutions: QoS
		Planning a QoS implementation is difficult, but many are finding it even more daunting to determine whether or not their deployment was successful.
		Without a means to directly quantify the network traffic utilizing each QoS class, network operators are left to guess whether their prioritization schemes are achieving the desired balance, are unduly impacting or restricting lower priority traffic, or are being compromised by improperly configured network devices.
		Evaluating and optimizing the QoS results by monitoring the new traffic patterns and testing the response times of the targeted applications to see whether the QoS goals have been reached.
	www.netscout.com /solutions/tech_qos.asp (669 words)

	QoS Admission
		QoS admission is the result of the negotiation process performed by the SRMS service's QoS negotiator, also known as the QoS admission thread.
		It also assigns the QoS admission thread to run at the same priority as the message handler thread, which is at a level lower than the SRMS scheduler and real-time task set.
		Ideally, the QoS admission thread could be processed by a second processor that speeds up the time to calculate a quality of service estimate, so a request queue to handle relatively fast calculations seems unnecessary.
	cs-www.bu.edu /groups/realtime/SRMS-NT/qos_admission.htm (1439 words)

	QoS Networking, Inc. (Site not responding. Last check: 2007-10-19)
		QoS in Australia: Founder/CEO Brad Wilson was a keynote speaker at the Compuware Vantage User Conference in Queensland, Australia.
		QoS has partnered with Compuware to provide the most comprehensive services in application quality and performance.
		QoS has supported some of the most critical networks in New York, and we are developing new partnerships to serve worldwide customers.
	www.qosnetworking.com (139 words)

	QoS Management with NetQoS Solutions (Site not responding. Last check: 2007-10-19)
		QoS policies can be a very effective way to fully utilize expensive WAN links and contain costs while maintaining acceptable levels of service for important applications and users.
		NetQoS enables you to determine the best use of QoS policies by identifying the network segments that will benefit most, and by measuring the impact of QoS implementations to verify that they are producing the desired results.
		By gaining global visibility into the composition, volume, and performance of all network traffic before and after QoS and other configuration changes, IT professionals are armed with the information they need to optimize networks for application performance while avoiding unnecessary infrastructure costs and minimizing the risks associated with change.
	www.netqos.com /solutions/it_qos.html (252 words)

	Support Center -- Application Notes (Site not responding. Last check: 2007-10-19)
		Enable the QoS Control, choose Direction "Both" and type the bandwidth ratio that you'd like to reserve for SIP VoIP traffic.
		SIP protocol (UDP:5060) is not defined in QoS Basic Configuration, therefore, we need to add a new Service Type via QoS Advanced Setup.
		RTP (real-time transport protocol), which is used to provide end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, Also is not defined in QoS Basic Configuration, therefore, we need to add a new Service Type via QoS Advanced Setup.
	www.draytek.com /support/support_note/router/application/qos/02.php (256 words)

	Why We Don't Need QOS: Trains, Cars, and Internet Quality of Service
		Not only can QOS make the Internet worse for applications we need and depend upon, it won't be able to help deliver on its promise.
		I also believe that while the need for QOS sounds intuitive at first, once you think about it a bit, you'll see that common sense argues against it in the context of the Internet.
		I have heard that the telephone system has at least one QOS feature that does not conform to your model of how things break down when there is too much low QOS traffic.
	www.bricklin.com /qos.htm (2514 words)

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