User's Manual

Table Of Contents
ECLIPSE INSTALLATION MANUAL
Power Supply
The dc power supply must be UL or IEC compliant for SELV
(Safety Extra Low Voltage) output (60Vdc maximum limited).
INUs require a -48Vdc power supply (+ve earth), but will operate to specification
over a voltage range of -40.5 to -60Vdc.
The return (+ve) pin on the NCC and NPC power supply connectors is clamped to
chassis ground via polarity-protecting power FETs.
l NCC and NPC power inputs are reverse polarity protected (the input fuse will
not blow if polarity is reversed).
For NEBS compliance the battery return connection is to be treated as a common DC
return (DC-C), as defined in GR-1089-CORE.
Where operation from a +24 Vdc PSU is required, the plug-in PCC option provides
voltage conversion from + 24 (19 to 36) Vdc to -56 Vdc for connection to the NCC -
48Vdc input. -56 Vdc represents the typical float voltage for a battery-backed -48
Vdc supply.
Power Consumption and INU Load Maximums
Total power consumed is dependent on the number and type of plug-in cards, and
the number and type of IRU 600s supported.
Unless otherwise stated reference to IRU 600 refers to all IRU
600 variants; IRU 600(v1), IRU 600v2, and IRU 600v3.
INU loading maximums, the number and type of RACs and DACs that can be
installed in an INU, are determined by the load capacity and temperature limits of
the DC converter in the NCC, which supplies various DC rails to the plug-in cards.
l IRU 600s and FANs are not powered via the NCC converter, meaning the IRU
600 type does not impact INU link loading. Their DC supply is taken from the
-48 Vdc power supply input connector.
However, if a PCC is installed for +24 Vdc operation, the INU cards and associated
IRU 600s are supplied from the PCC, meaning PCC power limits are determined by
the INU cards and by the number and type of IRU 600s supported.
l A PCC should always be installed to receive maximum FAN cooling. This
means it should be installed in the immediate FAN-side slots in an INU/INUe.
Power Consumption
The table below lists nominal power consumption figures for Eclipse cards. Use these
together with the IRU600 consumption figures in the following tables to determine
total nodal power consumption.
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