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Internet connectivity requirements

Last Updated: Aug 03, 2018 11:03AM CEST


A stable internet connection is crucial to the success of the live event.
A typical production using SlideSync will use internet connectivity for the following purposes:
  • Encoders sending 3-5 Mbit/s TCP video and audio streams to the SlideSync platform
  • Tablets / laptops using the web-based platform for event control and interaction, e.g.:
    • Controlling and updating the live presentation
    • Hosting Question & Answer sessions and live polls
    • Controlling event start / stop and updating event details

Requirements for encoder connectivity

For the encoding portion, we strongly recommend dedicated, wired internet connectivity with roughly twice the capacity required for the streams to ensure uninterrupted connectivity.
Streams are usually sent to the SlideSync platform twice for redundancy purposes. Participants will receive the streams via a global Content Delivery Network (CDN) rather than the on-site connectivity.

Use wired, rather than wireless connectivity

Both WIFI and LTE quality may fluctuate heavily depending on the time of day or the presence of attendees. Therefore, they should be avoided for streaming if at all possible.

Bandwidth requirements

10 Mbit/s connectivity will allow to send one to two HD feeds (note that 10 MBit/s will typically yield 8 Mbit/s net bandwidth).
2.5 Mbit/s allow to send one to two SD feeds (net bandwidth: 2 Mbit/s).

If no secondary connectivity is available, both primary and backup feeds must be sent over the same line. In that case, the figures quoted above need to be doubled.

Use a tool such as or to test the general upstream bandwidth.
To test the connectivity to SlideSync, use the SlideSync bandwidth test tool.

Keep in mind that other devices using the same internet breakout may adversely affect your bandwidth if they perform parallel uploads or even downloads (e.g. software updates).
If possible, arrange for Quality of Service (QoS) or ensure that only known devices are connected to the same breakout.

Secondary connectivity

If the event location can supply two separate internet breakouts from two different ISPs, it is highly recommended to send a parallel, secondary stream using the secondary breakout to ensure continuous delivery of the stream in case the primary internet breakout is impaired.
While it's desirable to provide the backup in the same bandwidth, encoding bandwidth may be reduced if the second provider supports only limited bandwidth.

MediaEvent Services can deliver secondary connectivity to virtually all event locations around the globe by means of a satellite uplink or a leased line (in Germany: DeutschlandLAN Connect by Deutsche Telekom).

Firewalls and corporate networks

Internet connectivity should be as direct as possible in order to prevent any adverse effects due to firewall rules, network configuration updates etc. in the middle of a multi-hour live stream.
That being said, a production using SlideSync only requires DNS service as well as outgoing (NAT) connectivity to * on TCP ports 443 and 1935.
Please do not whitelist individual target IPs or networks as they may change due to scalability and fail-over considerations. Rather, whitelist origin devices by their internal IP and/or MAC ID.

To verify connectivity, use the SlideSync bandwidth test tool.

Requirements for event control and interaction

For event control and interaction, only standard web browsing is required.
Therefore, bandwidth requirements are modest and wireless connectivity (e.g. a guest WIFI network) is usually sufficient, as long as it can be reliably used throughout the event.

Contact us

Further questions or comments? Contact our event support department:

MediaEvent Services GmbH & Co. KG
Event Support
Tel. +49 6441 87087-70
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