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Zixi can  be be deployed to pull parallel redundant sources to two targets. This topology includes two simultaneous streams pulled in parallel from two separate source nodes to a corresponding pair of redundant targets. The streams are pulled in parallel by the two redundant targets, creating two redundant paths to the destination. If a component in one of the paths fails, the alternative path can be used by the IRD. 

Two distinctly named inputs are created at the source Zixi Broadcasters. Each Zixi Receiver will be configured to Pull the stream from each of the Zixi Broadcasters. If the latency of the Inputs is identical, the streams will be frame synced providing they video is synced at the source.

Source Configuration

Configuring in advance the Pull output in the primary and secondary Broadcasters is not mandatory. 

To configure the primary first source node (e.g. Primary Zixi ReceiverBroadcaster):

1. On the Inputs page of the primary Zixi Receiver, click    on Broadcaster, click New Input on the upper-right end corner of the screen.
2. In the Output NameStream ID field, type a new name for the outputinput stream. 
3. In the Input Stream field, select the relevant input stream.
4. Select the PushSelect the a relevant connection type option.
5. In the Output Parameters section, under Links, enter the details of the target, including:
   The target Host - Specify the destination Broadcaster name or IP address to which you are pushing the stream.
   The Port number - Specify the ports to listen on for Push streams. Default - 2088
   Target IP -  Set the desired Max Latency in milliseconds.the Max Inputs field, do one of the following:
   1. Leave it as Unlimited.
   2. Specify the maximal number of connections (e.g. type "1" to enable a single Pull connection).
6. Specify the stream parameters according to the relevant connection type selected. 
7. Click OK to create the primary output,input.

To configure the secondary second source node (e.g. Secondary Zixi FeederBroadcaster):

1. On the OutputsInputs page of secondary the primary Zixi Feeder, click    on Broadcaster, click New Input on the upper-right end corner of the screen.. 
2. In the Output NameStream ID field, type the same a new name used for the primary output.
3. In the Output Parameters section, under Links, enter the same details of the primary target, including:
   The target Host - Specify the destination Broadcaster name or IP address to which you are pushing the stream (secondary target).
   The Port number - Specify the ports to listen on for Push streams. Default - 2088
   Target IP -  
4. Set the desired Max Latency in milliseconds

5. Click OK.

Target Configuration

1. the input stream. 
2. Select the a relevant connection type option.
3. In the Max Inputs field, do one of the following:
   1. Leave it as Unlimited.
   2. Specify the maximal number of connections (e.g. type "1" to enable a single Pull connection).
4. Specify the stream parameters according to the relevant connection type selected. 
5. Click OK to create the primary input.

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 Pull option.
4. In the Host field, enter the name of the primary source host Zixi Broadcaster. 
5. In the Port field, enter the port number as configured in the primary Zixi Broadcaster. 
6. In the Stream field, enter the stream ID as configured in the primary Zixi Broadcaster.
7. Configure additional parameters as required. 
8. Click OK.

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

1. Click the Inputs tab at the top of the Zixi Broadcaster Receiver administrative screen
2. Click New Input on the upper right hand side of the screen.
3. Select the Push Pull option.
4. Create an input at the primary target, ensuring the “Stream ID” matches that of the primary and secondary sources outputIn the Host field, enter the name of the secondary source host Zixi Broadcaster. 
5. In the Port field, enter the port number as configured in the secondary Zixi Broadcaster. 
6. In the Stream field, enter the stream ID as configured in the secondary Zixi Broadcaster.
7. Configure additional parameters as required. 
8. 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                = of both the source and the target. The configuration also requires using double the up-link bandwidth.  Allocation of twice the expected maximum bit-rate with head room is advised.

Latency Considerations

For detailed recovery time details, please contact your Zixi representative.