3-8 Aviat Networks
Chapter 3. System Overview
NCC
The NCC is a mandatory plug-in for an INU/INUe. It performs key node management
and control functions, and provides various dc rails from the -48 Vdc input. It also
incorporates a plug-in flash card, which holds Node configuration and license data.
Power input limits are -40.5 to -60 Vdc. The power connector is a D-Sub M/F 2W2. The
+ve dc return pin is connected to chassis ground.
Figure 3-16. NCC
FAN
The FAN is a mandatory plug-in. There are two variants, 2RU and 1RU. Each is fitted
with two long-life axial fans plus monitoring and control circuits.
• One 1RU FAN is fitted in an INU.
• One 2RU FAN is fitted in the INUe.
Figure 3-17. FAN (1RU)
NPC
NPC provides redundancy for the NCC TDM bus management and power supply
functions.
Figure 3-18. NPC
PCC
The PCC provides a voltage conversion function for locations where the power supply
is +24 Vdc. It converts + 24 (19 to 36) Vdc to -56 Vdc for connection to the INU -48Vdc
input. -56 Vdc represents the typical float voltage for a battery-backed -48 Vdc supply.
One PCC supports a maximum three IRU 600 RFUs, plus any combination of RACs
and DACs.
Figure 3-19. PCC
To Next Page
Loading...