"I do not need a lawyer to understand the term QoS JW@KSC."
JW >I do not need a lawyer to understand the term Quality of Service.
the term is quite plan and simple.<
Geof> Sorry Jim, but I think Steve has a point. If we are using datacom acronyms (like QoS) on a datacom thread, we have to expect that the reader will attach the meaning from the datcom world, not what a lay-person might interpret the same phrase to mean. QoS specifically comes from ATM and describes the performance parameters of a virtual circuit (independent of the physical layer). I could see
extending the meaning to include non-ATM-centric approaches to doing the same thing (like RSVP or class-based queing), or to doing related things like traffic shaping or policy servers, but not to physical-layer stuff.
Geof -
QoS has many meanings, and mine fit's into the overall scheme of things as well as yours. I'm not trying to distort the meaning in any way. Just the view point of the subscriber (End User).
If I tried top discuss all aspects of QoS, I would be here until Xmas.
So let me point to, and quote from sites that have my point of view.
ewos.be
Quality of Service is something that is often talked about as an important user requirement, but in the past little has been done in the standards area to give users any real influence over the QoS they may be able to obtain for the services they require. Typically, service characteristics are fixed when systems are built or when communications services are subscribed to, after which there is not much that users can do. OSI network and transport layer protocols allow limited signalling of QoS requirements, but in practice they offer little more than the ability to choose throughput classes when X.25 is used.
But this situation is changing. Multi-media applications can differ enormously in their requirements for throughput and transit delay, but may need to share communications channels. Industrial process control traffic has extremely stringent requirements for delivery within known time-windows, and will often need to use the same LANs as other traffic. So the demand is growing for users to be able to state or negotiate the QoS they need dynamically, which will allow the infrastructure to meet their needs and meet them efficiently. QoS has become a hot topic.
Much of the work on the dynamic treatment of QoS is still at the research stage, in industry and in universities. Most conference programmes now have a slot for QoS. QoS mechanisms are being developed for time-critical communications, the Internet, multi-media communications and so on .... And there is a group in ITU-T and ISO/IEC that is attempting to help in all this by developing some common concepts and terminology (so that not everything is called a QoS parameter!), and by providing a central place where QoS methods and mechanisms can be published.
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fokus.gmd.de
The purpose of the page is to collect all the information, activities that are relevant to, and people, who are currently active in the domain of Quality of Service.
The current page is by no means complete with respect to the lists collected and issues addressed. The solutions, problems and open questions shall be openly addressed, such that a QoS market place will occur.
The notion "Quality of Service(QoS)" is a widely used term in
standardisation and project efforts. For definition purposes we shall refer to the ODP description 11.2.2 of ISO/IEC IS 10746-2 which says: The notion QoS is a system or object property, and consists of "a set of quality requirements on the collective behaviour of one or more objects... Note: QoS is concerned with such characteristics as the rate of information transfer, the latency, the probability of a communication being disrupted, the probability of system failure, the probability of storage failure, etc."
The European Telecommunications Standards Institute (ETSI) describes in the book "The state of the art 1995" the QoS notion from the end-user's point of view.
Methods for the evaluation of service or system usability and human factors areneeded to improve the regular process of development. "It should be possible to evaluate the characteristics of a system or service as to its task performance. This should be done both qualitatively and quantitatively".
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This is the stuff I'm talking about.
End Users have a right to QoS, Just ask most Cable subscribers, or
ask End Users about the QoS from their current ISP's.
Now would you agree that End User support plays an Definitive Role in QoS?
Many End Users have stories to tell like the one below, though not that many take the time to express them, or express them as well.
infoworld.com
On second thought, make that 999,999 subscribers
I respect your thoughts Geof, please don't confuse my comments to SG,
with my conmments to the rest of the members here.
Batting Avg. Still Good
JW@KSC |
