Handbook of Local Area Networks, 1998 Edition:Applications of LAN Technology
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DATACONFERENCING
Dataconferencing, also known as document conferencing or audiographics, is an extension of today’s business practices. In 70% of audioconference calls, paper documents are sent to participants before the call starts. Dataconferencing replaces paper with computing power.
Following are several situations in which conference calls are supplemented with documents:
• The national sales manager sends out a preliminary forecast to the regional sales offices. Sales personnel in all offices use a conference call to discuss the forecast and make necessary changes.
• Two corporations and their attorneys are located in four different cities. One of the parties drafts a contract and sends it overnight to the others. They hold a conference call to discuss and make changes to the contract.
• A company releases a new version of its software. A class on the new software includes a PC-based presentation highlighting the product changes. The company sends a printed copy of the presentation to remote locations and conducts an audioconference to review the material.
In each of these situations, an audioconference call focuses around a document and could be enhanced with dataconferencing. Dataconferencing is a virtual connection between two or more computers where:
• All computers in the conference display a common graphical image to text, graphics, or a combination of both.
• Each computer in the conference displays any changes to the common image in near real-time.
• Participants have the ability to interact with the displayed document.
MULTIMEDIA CONFERENCING STANDARDS
Standard
Description
Status (as of 1/8/96)
H.320
An “umbrella” standard that covers audio, video, videoconferencing, graphics, and multipoint
Ratified
H.221
Frame structure for a 64 to 1920K bps channel in audiovisual teleservices
Ratified
H.230
Frame-synchronous control and indication signals for audiovisual systems
Ratified
H.231
control unit for audiovisual services using digital channels up to 2M bps
Ratified
H.233
Confidentiality systems for audiovisual services
Ratified
H.242
System for establishing communication between three or more audiovisual terminals using digital channels up to 2M bps
Ratified
H.243
Procedures for establishing communication between three or more audiovisual terminals using digital channels up to 2M bps
Ratified
H.261
Video code for audiovisual services at P × 4K bps
Ratified
G.711
3.1 kHz at 48, 5, and 64K bps (normal telephony)
Ratified
G.722
7 kHz at 48, 56, and 64K bps
Ratified
G.728
3.1 kHz at 16K bps
Ratified
T.120
Another “umbrella” standard for dataconferencing and works either inside H.320 or independently
Draft
T.121
Generic application template: a guide for data conferencing and works either inside H.320 or independently
Draft
T.122
Multipoint communication services (MCS) for audiographic and audiovisual systems
Ratified
T.123
Protocol stacks for audiographic and audiovisual teleconference applications
Ratified
T.124
Generic conference control (GCC): The application protocol supporting reservations and basic conference control services for multipoint teleconferences
Ratified
T.125
MCS: Protocol specification
Ratified
T.126
Collaborative data sharing, including “whiteboard” image sharing, graphic display information, and image exchange
Ratified
T.127
Multipoint binary file transfer
Ratified
T.128
Audio video control: high-level control protocols for the multimedia meeting
Draft
Source: IMTC, Inc.
Dataconferences require an audioconference to allow discussion of the documents and changes viewed on the computer monitors.
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