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regular telephone system; connects a large number of locations; short notice |
negative impact on users if audio is poor quality |
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regular phone system; extra telephone line for written, graphic, or video information; connect a large number of locations |
negative impact on users if audio is poor quality
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shows speaker, three dimensional objects, motion, video footage; approximates face to face; fully interactive ; two way video & audio |
one time special event generally used to extend campus classrooms not available to everyone |
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same as video; most economical for point-to multipoint broadcasts |
same as video requires wideband channel |
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same as video; allowed access to places not able to have full motion video |
same as video; requires T-1 or fiber optics; picture quality degraded from full motion video |
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same as video; two way synchronous communication; adds file transfer, screen sharing capabilities and collaboration |
requires ISDN to operate requires special equipment (computer & special ISDN card) |
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