Cisco ONS 15454 M6 6-Slot External Connection Unit With TOD/PPS 15454-M6-ECU2
The ECU2 is an advanced version of the ECU. The external connections of ONS 15454 M6 present on the ECU2 are The external connection unit (ECU) is a replaceable module placed on top of the ONS 15454 M6 shelf.