Ref. www.ibm.com/support/knowledgecenter/SS7K4U_9.0.5/com.ibm.websphere.zseries.doc/ae/cjc0051_.html
An application connects to a bus, which is its local bus, and can exchange messages with other applications that connect to the same bus. To exchange messages with applications that connect to an IBM MQ network, you need a WebSphere® MQ link that connects the local bus to a foreign bus that represents an IBM MQ network.
Applications that send a message to a queue in an IBM MQ queue manager or queue-sharing group can do so directly by configuring an IBM MQ server definition, or indirectly by using a IBM MQ link. This topic describes the message flow for a IBM MQ link.
With a IBM MQ link, there is a gateway messaging engine on the service integration bus and a gateway queue manager on the IBM MQ network.
Applications that are connected to the local bus send messages to a destination on a foreign bus. The messaging engine that the sending application is connected to on the local bus queues the messages on its link transmitter queue. Service integration flows the messages from the link transmitter queue to the corresponding known link transmitter queue in the gateway messaging engine. Messages then flow to a single sender channel transmitter queue, ready for transmission across the IBM MQ link.
The sender channel transmitter transmits messages over the IBM MQ link to a gateway queue manager or (for IBM MQ for z/OS® only) a queue-sharing group on the remote IBM MQ network.
The IBM MQ network appears as a foreign bus to the service integration bus and the service integration bus appears as a queue manager to the IBM MQ network.
The following figure illustrates an example of the message flow from a service integration bus to an IBM MQ network over a IBM MQ link.
Figure 1. Message flow between a service integration bus and an IBM MQ network
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