Cisco External Connection Unit

External Connection Units

The external connection unit (ECU) is a replaceable module placed on top of the ONS 15454 M6 shelf. The ECU module discovers and manages the inventory of the external shelf units. It also handles the multishelf management connections and timing synchronizations. There are three types of ECU modules available for the ONS 15454 M6 shelf, namely ECU (PN: 15454-M6-ECU=), ECU2 (PN: 15454-M6-ECU2=), ECU-60V (PN: 15454-M6-ECU-60=), and ECU-S.