This higher transmission is called higher bandwidth. What these prices show is that high speed access is possible and increasingly affordable. What we are finding is that functionality of video conferencing has not improved much since the first videophones. Video images are very demanding of bandwidth, consisting as they do of a large amount of data in even a small image. As the video image gets bigger than a postage stamp, the amount of digital data being transmitted escalates dramatically.
Audio transmission is a little better, the files being somewhat smaller.
Even then, the video image is grainy and periodically falls out of synchrony with the audio feed. In addition to video and audio, designers have to use other tools. At its simplest, drawings can be shared either by sending CAD files back and forth. Several CAD packages are now coming out with sophisticated database tools to track multiple users sharing drawings simultaneously, with the database system ensuring that no one overwrites files from someone else. Some of these tools will even help in coordination and data verification.