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Bandwidth Requirements For Video Conferencing

It's very important to understand bandwidth requirements for video conferencing. Your bandwidth is shared between incoming and outgoing connections, which in turn may differ significantly from each other.

The following video conferencing modes exist in TrueConf solutions:

Video Call HD
Multipoint Video Conference
Video Lecture
Virtual Meeting

Video Call HD

	Server		Client
Direction	Incoming	Outgoing	Incoming	Outgoing
Equation	2*128 Kbps	2*128 Kbps	1*128 Kbps	1*128Kbps
Bandwidth required	256 Kbps	256 Kbps	128 Kbps	128 Kbps

Multipoint Video Conference

Multipoint Video Conferences (symmetric group video conference) allow to connect up to 16 people simultaneously, so that all of them are able to see and hear each other and can work together on the documents and data.

Multipoint Video Conferences differ by the number of participants, below are calculations for 9, 12, and 16 participants cases.

for 9 participants

	Server		Client
Direction	Incoming	Outgoing	Incoming	Outgoing
Equation	9*128 Kbps	98128 Kbps	8*128 Kbps	1*128 Kbps
Bandwidth required	1152 Kbps (1,2 Mbps)	9216 Kbps (9,2 Mbps)	1024 Kbps (1 Mbps)	128 Kbps

for 12 participants

	Server		Client
Direction	Incoming	Outgoing	Incoming	Outgoing
Equation	12*128 Kbps	1211128 Kbps	11*128 Kbps	1*128 Kbps
Bandwidth required	1536 Kbps (1,5 Mbps)	16896 Kbps (16,9 Mbps)	1408 Kbps (1,4 Mbps)	128 Kbps

for 16 participants

	Server		Client
Direction	Incoming	Outgoing	Incoming	Outgoing
Equation	16*128 Kbps	1615128 Kbps	15*128 Kbps	1*128 Kbps
Bandwidth required	2048 Kbps (2 Mbps)	30720 Kbps (30 Mbps)	1920 Kbps (1,9 Mbps)	128 Kbps

Video Lecture

Video Lecture (asymmetric video conference) allows to connect up to 16 participants simultaneously, so that everyone is able to see and hear only one speaker, who in his turn is able to see and hear all the participants of the video conference.

for 16 participants

	Server		Client (speaker)		Client (listener)
Direction	Incoming	Outgoing	Incoming	Outgoing	Incoming	Outgoing
Equation	16*128 Kbps	30*128 Kbps	15*128 Kbps	1*128 Kbps	1*128 Kbps	1*128 Kbps
Bandwidth required	2048 Kbps (2 Mbps)	3840 Kbps (3,8 Mbps)	1920 Kbps (1,9 Mbps)	128 Kbps	128 Kbps	128 Kbps

Virtual Meeting

Virtual Meeting (or role-based video conference) allows to connect up to 120 users simultaneously in one meeting room where every participants can play a specific role. During a video meeting all the participants have certain roles and can be speakers (up to 4 participants at a time) or listeners (up to 116 participants).

for 4 speakers and 16 listeners

	Server		Client (speaker)		Client (listener)
Direction	Incoming	Outgoing	Incoming	Outgoing	Incoming	Outgoing
Equation	4*128 Kbps	419128 Kbps	3*128 Kbps	1*128 Kbps	4*128 Kbps	–
Bandwidth required	512 Kbps	9728 Kbps (9,7 Mbps)	384 Kbps	128 Kbps	512 Kbps	–

for 4 speakers and 46 listeners

	Server		Client (speaker)		Client (listener)
Direction	Incoming	Outgoing	Incoming	Outgoing	Incoming	Outgoing
Equation	4*128 Kbps	449128 Kbps	3*128 Kbps	1*128 Kbps	4*128 Kbps	–
Bandwidth required	512 Kbps	25088 Kbps (25 Mbps)	384 Kbps	128 Kbps	512 Kbps	–

for 4 speakers and 96 listeners

	Server		Client (speaker)		Client (listener)
Direction	Incoming	Outgoing	Incoming	Outgoing	Incoming	Outgoing
Equation	4*128 Kbps	499128 Kbps	3*128 Kbps	1*128 Kbps	4*128 Kbps	-
Bandwidth required	512 Kbps	50688 Kbps (50,6 Mbps)	384 Kbps	128 Kbps	512 Kbps	-

Notes:

1) the data is valid for TCP connections only;
2) to secure maximum performance we recommend:

to use wired connections;
to have 50% bandwidth safety margin;

For example, for a 9 participants multipoint video conference the server should have incoming bandwidth of: 1,2 Mbps х 150% = 1,8 Mbps, and outgoing 9,2 Mbps х 150% = 13,2 Mbps.

TrueConf ID
Password

Bandwidth Requirements For Video Conferencing

Video Call HD

Multipoint Video Conference

for 9 participants

for 12 participants

for 16 participants

Video Lecture

for 16 participants

Virtual Meeting

for 4 speakers and 16 listeners

for 4 speakers and 46 listeners

for 4 speakers and 96 listeners

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