Dual PULL Transmission from Redundant Sources (Full Cross-Over)

This topology includes source and target redundancy with additional cross-over redundancy capabilities. The topology includes two simultaneous streams delivered in parallel from two separate source nodes to a corresponding pair of redundant targets. If the latency of the outputs is identical, the streams will be frame synced, providing the video is synced on entry. In addition, in the unlikely event that a second loss occurs at the opposing connected end-point, the automated cross-over mechanism uses the resources of the opposite path, providing a stream with minimal disruption.

The configuration is performed on the target Zixi Receivers. There you will configure a Pull input from the primary broadcaster, which includes a backup host (secondary Zixi Broadcaster). The stream has to be defined in the primary and secondary broadcasters as inputs with the same stream ID. In runtime, the Zixi Receiver will connect to the primary Zixi Broadcaster and the output is created automatically "on the fly". If the primary source becomes unavailable the target will attempt to pull the same stream with the same stream ID from the secondary source (which has been defined as the Backup host). 

A single Input is created at the source Zixi Broadcasters, 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 primary 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. In the Max Outputs field, type 1. 
4. Select the Pull option.
5. In the Stream Parameters section, enter the details of the input stream, including:
   The Host - Specify the host name or IP address of the source of the stream. For example, the Zixi Feeder's host name. 
   The Port number - Specify the ports to listen on for input streams. Default - 2088
   Stream - the stream ID 
6. Set the desired Max Latency in milliseconds.
7. Click OK to create the primary output,

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

• Repeat the steps above on the secondary Zixi Broadcaster with the second input stream parameters. 

Target Configuration

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

1. Click the Inputs tab at the top of the Zixi Receiver 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                =