Appendix A: Multiple Chassis Local Connect
Multi-chassis Extension Unit
98 | SmartBits 600x/6000x Installation Guide
Multi-chassis Extension Unit Terminology
The terminology used with Multi-chassis Extension Unit connections is defined as follows
and is shown in Figure A-8:
• Primary Controller – The main chassis which controls the synchronization for all
the chassis and extension units in the configuration.
• Principle Extension Unit – The extension unit that is connected to the primary
chassis.
• Dependent Controller – Any chassis that relies on another chassis or an extension
unit for its synchronization.
• Subordinate Extension Unit – An extension unit that relies on a dependent chassis
or another extension unit for its synchronization.
• Flat Connection – An extension unit that is connected to, and relies on, another
extension unit for its synchronization.
• Hierarchical Connection – A series of connections from extension units to
SmartBits chassis in multiple layers.
Figure A-8. Multi-chassis Extension Unit Terminology
Primary Controller
Principle Extension Unit
Subordinate Extension Unit
Dependent
Hierarchical
Flat
Connection
Connection
Controller
Dependent
Controller
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