RFC 1453 (rfc1453) - Page 3 of 10
A Comment on Packet Video Remote Conferencing and the Transport/Network Layers
Alternative Format: Original Text Document
RFC 1453 Comments on Video Conferencing April 1993
of remote conferencing. Client/server applications including data
base operations are equally important. The ability to display
noninteractive video and high-resolution graphics is necessary.
As with most applications, security will eventually be an issue. At
the very least, there must be a mechanism to determine who can find
out what about conference and who can join a conference. This
determination will be part of an upper-layer protocol.
+--------------+ +--------+ +-----+ +------------+
|Teleconference| | File | |Email| | Domain |
| (CCP) | |Transfer| | | |Name Service|
+----+-------+-+ +-----+--+ +-+---+ +-----+------+
| | |__ __| |
| | || |
+-----+--+ +--+-----+ +-++-+ +----+---+
|Network | | Packet | | T | | U |
| Voice | | Video | | C | | D |
|Protocol| |Protocol| | P | | P |
+---+----+ +--+-----+ +-+--+ +--+-----+
|__ __| |__ __|
| | | |
+-+---+--+ +-+-------+-+
| Stream | | I |
|Protocol| | P |
+---+----+ +---+-------+
| |
+-----+----------------------+----+
|IEEE_802.X,FDDI,DARTnet,ATOMIC...|
+---------------------------------+
Figure 1: The Connection Control Protocol Architecture
The solutions must range in geography from single machines through
LAN, CAN, MAN, WAN conferences, as well as in data content from PCs
to high-end workstations. Implicit in the scaling is the notion of
product and application interoperability.
Remote conferencing applications should take advantage of future
network enhancements, as well as the functions provided by ATM, FDDI,
and SMDS. Doing so should provide function versus resource trade-
offs such as cost versus error control and cost versus rate control.
As a result, the transport layer should be able to provide the
services offered by the data link layer.
Most of the presentation on remote conferencing indicated a need for
some degree of multicast functionality, ranging from the 1-to-n, with
conference membership completely known, to conferences for which
Chimiak