Dual PULL Transmission from Single Source (Warm Redundancy)

Zixi can be deployed to pull a stream to redundant targets. This topology shows a stream that is pulled from a single source node to a corresponding pair of redundant targets in a warm redundancy configuration. The stream is not pulled in parallel, only when the Main Zixi Receiver fails, the Backup Zixi Receiver will be able to pull the stream from the Zixi Broadcaster.

A single Input is created at the source Zixi Broadcaster, which includes a Max Outputs limitation of 1 output. The same Pull input is created in both the Main Zixi Receiver and Backup Zixi Receiver. In runtime, the Zixi Receiver will connect to the Zixi Broadcaster and the output is created automatically "on the fly". If the Main Zixi Receiver becomes unavailable, the Zixi Broadcaster will grant the Backup Receiver with the permission to pull the stream. However, when the main Zixi Receiver becomes available again, Zixi Broadcaster will not grant a permission to pull the stream again (due to the max outputs limitation) until the Backup Zixi Receiver stops pulling the stream.  

Source Configuration

To configure the source node (e.g. Zixi Broadcaster):

1. On the Inputs page of the primary Zixi Broadcaster, click New Input on the upper- right end corner of the screen.
2. In the Stream ID field, type a new name for the input stream. 
3. Select the a relevant connection type option.
4. In the Max Inputs field, type "1".
5. In the Stream Parameters section, under Links, enter the details of the target, including:
   The target Host - Specify the destination Broadcaster name or IP address.
   The Port number - Specify the port on . Default - 2088
   Target IP -  
6. Set the desired Max Latency in milliseconds.
7. Click OK to create the primary output.

Target Configuration

To configure the target node (e.g. Zixi Broadcaster/Receiver):

1. Click the Inputs tab at the top of the Zixi Broadcaster administrative screen
2. Click New Input on the upper right hand side of the screen.
3. Select the Push option.
4. Create an input at the primary target, ensuring the “Stream ID” matches that of the primary and secondary sources output.
5. Configure additional parameters as required. 
6. Click OK.

Cost Considerations

This topology duplicates the source Zixi hardware and software components. It does not require doubling the uplink bandwidth as the backup connection stream is only active in the event that the primary fails. 

Latency Considerations

Primary Connection loss         = 

Retry cycle                              =

Connection to secondary        =

Total recovery Time                =