QoS Application

The Vigor router normally distribute the available Internet bandwidth equally between all local users and all applications. In the case of a file download, it's quite reasonable to merely receive the file as soon as resources allow, taking the demands and needs of other into account, equally important users and applications while downloading, you can get on with other work.

If Jane's E-mail attachment is an important contract and David's file download is a computer game, it is obvious that David can wait for more than 1 hour as it is very low priority for the company. On the other hand, it is very essential for Jane to quickly download her E-mail attachment which she needs to review with her attorney within certain time frame. Jane's E-mail is very high priority for the company. This is what QoS is all about ?giving different priorities to different types of data of users and allocating them with the most appropriate Internet bandwidth.

DrayTek's Quality of Service Assurance (QoS) lets you select sets of traffic types and give each type a guaranteed percentage of the available bandwidth. Using the earlier example again, the http downloads have been limited to a very low priority of 10%, and the E-mail downloads a high priority of 90%. If David is the only person using the Internet, his http file download will come in at 1Mb/s, but as soon as Jane starts her E-mail download, David's download speed will drop to 0.1Mbps, whilst Jane gets 0.9Mb/s -90% of the bandwidth.

Without QoS-guaranteed control, there is virtually no way to prioritize users/services or to guarantee allocation of finite bandwidth resources to network or servers for supporting timing-sensitive and mission-critical network applications, such as VoIP (Voice over IP) and online gaming applications. The VoIP applications carry person-to-person voice calls across your Internet connection. You cannot wait for VoIP packets as they have to be received at re-assembled at a constant rate in order for the voice to be intelligible. It is extremely vital for VoIP traffic to be assured with the immediacy by using QoS. As such, SIP VoIP traffic is always allocated as much bandwidth as it needs if your Vigor router supports QoS. Although priority for applications will depend on your own specific requirements, you still have plenty of other bandwidth available on a typical broadband line while the 8-32Kb/s-bandwidth-consumed VoIP traffic will be prioritized and sent immediately.

Moreover, in the Vigor routers, we also take the support of DSCP (Differentiated Service Code Point) code into consideration in the design of our QoS-guaranteed control module. We have already implemented High Priority to Vigor built-in VoIP traffic and hence please do not disable "QoS" settings in order to assure your Vigor built-in VoIP calls be with High Priority.