The SCA.SYSTEM bus used for SCA modules is a standard service integration bus, as used in WebSphere Application Server. Besides the SCA.SYSTEM bus, you can also create other service integration buses to support service integration logic or other applications.
For example, the SCA.APPLICATION.cell_name.Bus is provided and used to define JMS queue destinations and other JMS resources for modules deployed with JMS bindings.
You can create other buses for use as in WebSphere Application Server; for example, for applications acting as service requesters and providers within WebSphere ESB, or to link a bus to WebSphere MQ. You can also use a WebSphere ESB deployment manager to manage separate application servers, for use with applications and modules deployed onto WebSphere Application Server.
Detailed information about doing more with bus topologies is provided in the Service integration set of topics for WebSphere Application Server.