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Home  Tips and tricks The quality of calls and internet access
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The quality of calls and internet access |
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 I am already standing unless the Lord 'client'. Your answers to my questions I always fully satisfaction, but there is always some new problem, whose solution is worth to ask an expert. Problem: I have the Internet Multimedia on the web, I live in Los Angeles. Agreement with the \ "Media \" I have signed for the package 128. The agreement says that it is exactly that the service provider or 'Multimedia' undertake to provide services to omaksymalnej speed 128. Do not write anything to download or whether to send data. (D / Up). For some time, I'm using the programms like 'Numion' and 'Test spid', checked the quality of the link. I noticed that, for proper communication by Voip is also very important so-called. delay in packet transmission (latency). I do not know if I wrote well, but surely you will know what's going on.
Thus, in the most recent period (December 2006) average the highest speed of the former link: D / U / L = 122/57/203 milliseconds.,-And were lower. I use two operators Voip,: Iptanifon and Betamex. Although Iptanifone can get along as normal, Betamax no longer made.
Raised a complaint, they came with gentlemen technicians Multimedia link (less agreed with my more measurements) and that it doesn't solve. They've proposed me, the purchase of higher package 256.
My question is this:
Are there technical standards defining the parameters that should meet the internet for example if I have to have (D) 128, how much should be (U), if-(D) 256, how much should be (U), which should be a delay in the submission package etc. Please give any reply where I can look.
I am pleased that the former Lord satisfactioning answer, but probably will not have exhausted the subject, as on both network and VoIP services could write for hours ... As for today's questions - if the operator does not specify the speed of download / upload, and gives a value of one, I understand this as the "symmetrical. As far as traditionally, older packages on Multimedia include symmetrical links, now I know that in the tender are also asymmetrical 512dow/256up. Such things no longer the best place to go to the operator, since it does not follow various tenders. From what you wrote me a 'D / U / L = 122/57/203 milliseconds' shows that you have a link 128kbps down/64kbps up.
If you use VoIP service to link the stability of the Internet is of course crucial. Even if the operator has a voice dedicated tracks (E1/SS7) is if the end user will have problems connecting to your voice, the quality of service will be unsatisfactory. With the delay of voice calls is not the most crucial element, provided that the amplitude of response times (latency) oscillates within the limits of the 30-50ms. Even with a fixed 150 ms delay for example, conversation should be easy, but if the response time is 20ms, 150ms for a moment, to hear the effect. It is also helpful to know when there is a 'high pings' - you see it is usually due to overload bandwidth (or your operator) or it may be the result (if the package from your computer to the router the destination must pass through several routers - go through a router is called hop - the answer to your package from the router to the maximum time to the router on the way). Sometimes, our operator has a direct contact with any other operator, so the number of hop to the router / host will be relatively small and in such situations will be delayed for a few to several ms.
As for the standards of delays, it seems to me that there is no such document (on the internet). There are too many factors affecting this parameter, but always the less the better. In contrast, it is understood that the network technology build in 100Base-T (fastethernet 100MB / s - local area networks) is less than 10ms.
As far as the link bandwidth needed to VoIP - it's a matter of codec used. When G711a/G711u codecs - provide very good quality discussions - (they are probably at this time in the minutes standard SIP) consumption is a link in the conversation about 64kbps/64kbps + payloady - that is, we use an aggregated 80kbps/80kbps ok. We know that these values vary depending on the amount and direction of the transmitted voice - if we say a silent caller will be charged to upload more than download. |
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