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Skype Meeting Broadcast automatically adjusts the resolution based on available client bandwidth. Be aware that if all users are attending from the same location, you'll see a unique stream to the Internet for each user. Viewers of the broadcast will connect to the geographically closest Azure Content Delivery Network location to stream the broadcast.
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Be aware that any on-premises pools aren't used. Therefore, they're moving out of the internal network and crossing into the public Internet. The producer and presenters are connecting to a meeting that is hosted in the Skype for Business Online infrastructure.
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The bandwidth requirements for the Skype Meeting Broadcast producer are the same as those for a regular Skype for Business meeting and depend on the number of participants in the inner meeting (that is, the meeting that the event team members join for a Skype Meeting Broadcast) and the presentation options that are used. This article contains information about the bandwidth requirements for Skype Meeting Broadcast. Bandwidth requirements for Skype Meeting Broadcast Introduction
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