Stop. You have completed this procedure.
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=), ECU-S, and ECU60-S.
The ECU and ECU2 modules can be interchanged on an ONS 15454 M6 shelf without any alarms.
A label, as shown in the following figure, is present on the ONS 15454 M6 shelf indicating the connections
for the ECU module.
Figure 66: Connector Label for ECU Module
ECU
The external connections of ONS 15454 M6 present on the ECU are:
• 12 remote inventory standard USB connections
• 2 BITS-OUT connections (2 subminiature version B [SMB] connectors for ETSI and 4 wire-wrap pins
for ANSI)
• 2 BITS-IN connections (2 SMB connectors for ETSI and 4 wire-wrap pins for ANSI)
• 6 multishelf connections
• 1 element management system (EMS) connection
• 1 craft terminal connection
• 2 VoIP or 2 user data channel (UDC) connections, or one each of VoIP and UDC connections
• 1 SCSI with 26 poles for TNC and TNCE relay contact, including alarm cut-off (ACO) signal and digital
I/O (D-I/O) signals (on the left-side connector)
• 1 SCSI with 26 poles for digital I/O signals (on the right-side connector)
The following figure shows the ECU connectors.
Figure 67: Connectors on the ECU Faceplate
The ECU should not be used when the shelf is powered at –60V DC nominal input voltage.
Note
Installing the ONS 15454 M6 Shelf
72
Installing the ONS 15454 M6 Shelf
External Connection Units
