reflective surface and bandwidth

[michael.s.phoebus2.ctr1]

Recently one of our techs were asked about the glass top tables in our conference room and does a reflective surface lower VTC bandwidth? If so, by how much roughly? And is it significant enough to remove the reflective surface from the conference room?

[pieterh]

You probably refer to interferentie of wifi signal by reflection?

yes the glas surface will have invluence. Now much is not to tell remotely.

But I'll Guess. It will not be enough to make VC unusable.

wifi-n speed may run up to above 100Mbps while VC needs about 4

[michael.s.phoebus2.ctr1]

Thank you however these systems are wired only.

C20/40/60's connected to the LAN

During Audio and Video checks someone pointed out that the glass tabletop in our room(s) could lower VTC bandwidth in or out.... I've never heard of this and wanted to know if this is a was possibility.

[Wayne DeNardi]

The only way it would "Lower bandwidth" would be if there is a lot of movement and the camera was seeing the reflections from the glass surface as well as the people, and therefore, a large percentage of the image it is capturing is changing from frame to frame, therefore, more data needs to be sent to keep the image up to date.

It's not really "lowering" the bandwidth, just sending more frequent updates over the existing bandwidth.

Wayne
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[pieterh]

Video data uses compression. In this compressed data steady objects are not continually transmitted, but once every "<x> frames, but when it moves around, all changes in the image needs to be transmitted (all changeing objects and some space around it).

As Wayne alredy explained, "moving" objects on the reflecting surface can lead to more data.because the moving object AND its moving reflection needs to be transmitted.

Thus bandwith is not "lowered" but MORE bandwith is used. leaving lower bandwith for other devices in the uplink of your network.

Used bandwith will not go beyond the maximum bandwith needed for the image resolution in use.If your VC system specified 2-4 Mbps bandwidth max, than this IS the max.

If the room is connected by wire, then this bandwith use is only interesting if you need to transmit the data over slow WAN links to other locations.