Wireless Video Presentation System II
Wi-Fi VGA Presentation System
Frame rate and delay. The WVPS II system is best used with still content, like a slide show or a series of photographs, rather than full motion video. This is because frame rate is much lower than a comparable wired system, so video can appear jerky or stuttering. Additionally, video can sometimes suffer significant delay, bringing it out of synch with audio.
Why does this happen? The main issue with presentation over wireless is available bandwidth. The bandwidth of a wired VGA signal is much greater than that of a wireless transmission. Furthermore it is not shared while the wireless connection is. It is difficult to compare VGA and WiFi bandwidth since one is analog and the other is digital, but consider this: 802.11g wireless has a maximum bandwidth of 6.75 megabytes per second. A simple single-link DVI cable has a maximum bandwidth of 0.619 gigabytes per second. In other words, DVI is anout one hundred times faster. So when using a wireless connection, each user has much less bandwidth, thereby limiting the amount of data that can be transmitted. The WVPS II's presentation software does its best to optimize, including a video mode that prioritized frame rate and synch, but the end result is still fewer frames per second and a jerkier appearance with video.
Slideshows or photographs do not suffer, because the content on screen is static. Frame rate only matters when changing slides, and in these instances a little bit of delay can go unnoticed. But when you're watching video, you will see delay, stuttering, dropped frames, and a generally unpleasant video experience. If you need high-quality video, stick to wires.
Dated technology. This is more of a general feeling, but several technologies in the WVPS II feel like leftovers from the previous generation. WPA security has been required for Wi-Fi certification since at least 2003, yet the WVPS II lacks WPA support. 1280x768 is much less common than 1280x800 in laptop computers, yet 1280x800 is not supported while 1280x768 is. And of all the mobile platforms to support, the developers chose to use Windows Mobile, an operating system that has been on its way out the door since late 2008. While these quirks do not affect the core functionality of the WVPS II, they do seem like odd choices.
The Black Box Wireless Video Presentation System II is, despite the lengthy name, a simple product that fills a need in the business presentation world. Now there is a non-brand-specific way to display presentations wirelessly that is easy to use and understand. While it is not suitable for extensive video use, it is a great choice for that most common of meeting companions: the PowerPoint slideshow.
The Black Box WVPS II is not for everyone. If your company has dedicated conference rooms, or you don't often switch presenters in mid-meeting, the WVPS II would be overkill. It is designed to make life easier in high-traffic meeting rooms under very specific circumstances, and it does that job admirably. As long as you are aware of the limitations, the WVPS II can make your meetings run much more smoothly.
|Review Contents:||Applications||Advantages||Additional Advantages||Limitations|