Where does cable termination occur in most buildings?
csu/dsu
core switch
demarcation point
patch panel

Demarcation point  is known the point of termination of cable between building and utilities.

Explanation:

In most of the building designs a location has been set that is used for the entrance of all types of cables such as, telephone, internet, or other telecommunication services providers. The service provider makes a point that at this place where users from building connect with the cable to the outside service providers. This point is used for the purpose of cable termination. This is known to as Demarcation point .

The users are responsible for the maintenance of cable till this point. After this point utilities provider will responsible for service and maintenance.

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