Your business wants to use video conferencing and multimedia applications. How to Determine Your Bandwidth Solution (T1, DS3, OCx / Sonet, etc.) How would you best match your needs?
I can say that it depends on what kind of service and QoS you are looking at. For example, when you say "video" means video conferencing and not like VoD. Bandwidth requirements vary according to service requirements.
For example: For IPTV services, picture quality depends on the encoding used: MPEG-2 is approx. 3.75 Mbps while MPEG-4 is approx. 2 Mbps of the same high-quality imaging. The broadcast TV is also transmitted via IP Multicast, which makes bandwidth dependent on the number of channels offered and the encoding rate. The MPEG-2 200 channel is standard at approx. 750 Mbps bandwidth. VoD is a unicast per-viewer channel. 1000 standard Definition VoD users should be appropriate. 3.75 Mbps.
The QoS requirements for H.323 (SIP) videoconferencing can be modified in Rule 75 as follows: Calculate the minimum bandwidth required for each application (eg Video, Sound, Data). Full bandwidth is the smallest requirement for any reference, and should not be more than 75% of the total available bandwidth. The 75% rule allows you to allow bandwidth for extra traffic, such as routing, Layer 2 storage, and other applications, such as email, HTTP, and so on.
So the capacity design for H.323 should be similar to:
Video data + 20% = Bandwidth required.
Video Rate: Required Bandwidth:
512 kbps = 614 kbps
1.5 Mbps = 1.8 Mbps …
may consider Cisco's offers and TANDBERG boxes .
Cisco consultants have everything in 766Kb to have a "slow connection" with VOIP. You should also consider the criticality of sites, so you may need two separate connections. All multimedia applications run at the top of other applications, so QoS will only enable you to do first.
You need a good baseline for non-multimedia applications (VOIPs). Therefore, bandwidth should be able to handle all the necessary applications in the network.
It should also be remembered that the bandwidth agreement in the data center needs to match or exceed incoming remote site traffic. In other words, if I have three remote locations, all of them with T1. You need to manage more than one T1 in the data center. Keep in mind that this is not a green field, but the baseline, the baseline, the starting point!
When it comes to video streaming, it is bidirectional – you should consider the quality of the compression you want to use. If you want high resolution video 1 direction, you must have at least 2 MB in the direction of the video you want to watch.
So if you upload video to your computer, you need to make sure you have 2 MB of download capacity. Also, another thing to keep in mind is delaying and losing packets. I would suggest keeping away wireless technology from these types of applications as it will later add a delay and later cause problems. DS3 bandwidth and anything higher may be dying, but they can easily handle your needs.
Without knowing the specifications, it is difficult to give a precise answer, but it is still possible to determine a systematic method for calculating the required bandwidth. If you know the requirement for bandwidth, it is about negotiating the cheapest way to have this bandwidth available from a network provider in the region.
This is what I would suggest:
1. Calculate the peak external bandwidth requirements (inter-office data transfer, video conferencing, email transfer, tens of millions of attachments, e-mail traffic can not be ignored at this time).
2nd Real-time applications are mostly jitter and delays sensitive – so be sure to get enough bandwidth when you need it. The bandwidth of the video depends on the MPEG profiles used (without having a specific, usually 1.5 Mbps speed, it can give a very good video on a PC (equal to VCD quality). HDTV images require about 20 Mbps – IP TV providers). Most current users of interactive video communication will be satisfied with encoded and forwarded images @ 512 Kbps. This includes audio and video recordings and control signals. So you need at least 512 kbit / s speed per video stream, and the better (1.5 Mbps if you're a big organization and you're using a big TV for video conferencing)). So, propagate the bandwidth to a single stream with the number of parallel streams required. It now determines the real-time use of the peak.
3rd There is no specific rule – but sages have the experience that the peak value will remain within 60-75% of the available network bandwidth in real time, leaving the remaining background traffic capacity. For a small organization of 5 people, it is easy to tell people not to download gigabytes of attachments during video conferencing, but it is difficult to enforce them in larger organizations, except routing guidelines (provided they have QoS support) and occasionally unhappy users.
4th Now, as you know the bandwidth requirements, it's time to talk to your network operator about how to provide bandwidth in the most cost-effective way.
Source by SBOBET