Lync Server 2010 Media Traffic Network Usage

When planning for media bandwidth usage per scenario, use the following tables, which describe the average amount of bandwidth used per media type.

Audio/Video Capacity Planning, Peer-to-Peer Sessions



Audio/Video Capacity Planning, Conferences



Audio Capacity Planning, PSTN



The network bandwidth numbers in these tables represent one-way traffic only and take silence suppression into account.

When you calculate the actual bandwidth usage for a certain scenario, it is important to understand the actual media flows, which are as follows:

In a two-party scenario:

• Users send audio streams only while they speak.
• Both participants receive audio streams.
• If video is used, both users send and receive video streams during the entire call.

In a Conferencing scenario (that is, a call with more than two participants):

• Users send audio streams only while they speak.
• All participants receive audio streams.
• If video is used, only two participants upload a video stream at a time (that is, the active speaker and the previous active speaker).
• If video is used, all participants receive video streams.