D15329.08 SX20 Administrator Guide CE9.2, NOVEMBER 2017.   www.cisco.com — Copyright © 2017 Cisco Systems, Inc. All rights reserved. 
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Cisco TelePresence SX20 Quick Set  Administrator Guide
Extend the number of input sources
Architecture
You need a Cisco video system with a touch interface, a third-
party control system, for example Crestron or AMX, and a third-
party video switch. It is the control system, not the video system, 
that controls the video switch.
When you program the control system you must use the video 
system’s API (events and commands)
*
 in order to connect with the 
video switch and the controls on the touch interface. This way you 
can synchronize what is shown and done on the user interface 
with the actual state of the input sources.
Video system
Third-party 
video switch
PC
Apple TV
Chromecast
Other...
Control 
system
API
Touch 
interface
* 
You need a user that holds the ROOMCONTROL, 
INTEGRATOR, or ADMIN user roles in order to 
access the API commands that you need when 
programming the control system.
You can customize our touch user interfaces to include input 
sources that are connected to a third-party external video switch.
The sources will appear and behave as any other video source 
that is connected directly to the video system.
User interface with multiple external input sources (example)
Consult the CE Customization guide for full details about how to 
extend the user interface, and how to use the video system’s API 
to set it up. Go to: 
► https://www.cisco.com/go/in-room-control-docs