Higher quality in video is obtained by using higher resolutions, more colors (increased bits per pixel), spatial audio (multiple audio channels and higher sampling rates), and multiple displays. All of these parameters increase demand for bandwidth — in turn increasing the sensitivity to degraded network conditions.
With video, when the impairments become apparent, the experience of the session deteriorates very quickly. Users are easily disturbed by poor video quality — and the bandwidth burden of video means that even slight deterioration of services within the network can significantly affect the video experience. Similarly, with video, the accompanying audio experience must be satisfactory and synchronization with the video must be consistent — and even more stringent requirement.
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Tags: medianet, quality, video, video deployment
Video applications can be very sensitive to aspects of network performance. After the video has been packetized for IP transport, the network’s contribution to the video stream’s performance is generally limited to delay, jitter, and loss.
Delays arise from physical limits (speed of light) as well as queuing mechanisms in routers and gateways that the packets traverse along the way. When delay increases above 400 milliseconds (camera to display), people become aware of it and the delay starts to impede interactive communications.
Jitter is the variability of delay. Buffers can be used to smooth out variations in delay. However, too much buffering adds delay and prevents effective interactive video.
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Tags: medianet, performance, video, video deployment
I guess it’s a bit natural to feel a sense of pride when you are a part of the team that has innovated the vast majority of LAN Access switch features in the market. I joined this group about 2 years ago and have been in awe ever since. If innovation and the sheer brilliance of simplicity excites you then this should be a fun read.
It is probably obvious that every single endpoint connects to the network ONLY through an access switch. Even the wireless ones.. through the access point that is plugged into the access switch. So no endpoint can get into the network without going through an access switch.
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Tags: 3560-X, 3750-X, access switch, ASP, Auto QoS, Auto Smartport, borderless network, catalyst switch, medianet
The deployment of network video applications presents several challenges for the network and application administrator. These challenges can be categorized into having predictability, offering performance, and delivering quality.
The deployment and integration of voice into the network was relatively simple compared to the challenges being brought by multi-faceted IP video applications. As with Voice over IP (VoIP), video over IP allows the reuse and convergence of communications infrastructure. Where different types of delivery mechanisms (satellite, DVDs, taps, and coax) were needed for the various types of video, a single transport system can now be used. With VoIP, there was concern regarding some aspects of network characteristics such as delay and jitter. If the video application is an interactive one like video conferencing, then delay and jitter do remain important. However, in other types of video applications (for example video surveillance), the amount of raw bandwidth to deliver high quality video can also be a limiting factor. Additionally, unlike voice, minute network degradations can result in easily noticeable impairments that remain on screen for a longer amount of time.
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Tags: medianet, predictability, video, video deployment
The world is becoming flat. Enterprises are optimizing the diverse talents and skills of employees and partners around the globe. The challenge of globalization is to provide effective communication across distances and cultures. Enterprises must focus on improving collaboration. The use of video to communicate and collaborate, for information sharing or e-learning, is perhaps the closest alternative to actually being there, enterprises will be able to transcend physical location. For more information, Cisco conducted an interesting study, “The Psychology of Effective Business Communications in Geographically Dispersed Teams.”
The cost of traveling represents a significant proportion of recurring operational expenses for many enterprises, so many of them are looking for ways to reduce travel costs. The key is to make travel more productive by reallocating travel time to videoconferencing for routine internal meetings, and using that travel budget to visit more customers. In addition to cost savings, enterprises are turning to video to show shareholders and customers that they are serious about reducing their carbon footprint and doing what they can to be a Green company.
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Tags: business video, medianet, video