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Classical Central Instance or Standalone Enqueue

There are two kinds of enqueue services in SAP system. 
1) Classical Central Instance with the Message Server and Enqueue service running in a dialog instance. Usually a ENQ work process is also available;
2) Standlaone Enqueue Server (ENSA) where the Message Server and enqueue runs in a separated application server called ASCSXX or SCSXX where XX is the instnace number

In order to check if your system runs a Classical CI or a Standalone  Enqueue you can check in SM12 -> Extras -> Diagnosis

Classical CI:

 

Standalone Enqueue Server:

 

 

 

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