User's Manual

6-2 Aviat Networks
Chapter 6. Installing the INU and INUe
Figure 6-1. Typical INU Front Panel Layout
INU Power Supply
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.
• 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 a typical float voltage for a battery-backed -48 Vdc
supply.
The dc power supply must be UL or IEC compliant for SELV (Safety Extra Low Voltage)
output (60 Vdc maximum limited).
Fault
FAN
Fault
FAN
DAC 16x
Status
Trib 1-8 Trib 9-16
DAC 16x
Status
Trib 1-8 Trib 9-16
12
45
6
To
ODU
RAC 30
On-Line
Status
To
ODU
RAC 30
On-Line
Status
To
ODU
RAC 30
On-Line
Status
To
ODU
RAC 30
On-Line
Status
Slot 1 Slot 2 Slot 3
Slot 4
3
7
-48VDC
No Item/Label Description
1 Rack Ear and
grounding stud
Rack attachment bracket for the IDC. One ear has a
combined ESD and IDC grounding stud. The ears can be
fitted either side, which provide flush-with-rack-front
mounting.
2RAC RAC fitted in slot 1
3NCC Mandatory node Control Card (dedicated slot)
4Blank Panel Blanking panel fitted to slot 2
5RAC RAC fitted in slot 4
6DAC 16x 16xDS1 DAC fitted in slot 3
7FAN Mandatory fan plug-in (dedicated slot)