User's Manual

VOLUME II, CHAPTER 1, SYSTEM OVERVIEW
Figure 1-17. FAN (1RU)
NPC
NPC provides redundancy for the NCC backplane bus management and power sup-
ply functions.
Figure 1-18. NPC
PCC
The PCC provides a voltage conversion function for use at 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.
Figure 1-19. PCC
Data Packet Plane
The high-performance data packet plane (DPP) operates independently of the back-
plane.
The DPP is enabled via direct cable connection between the front panel packet data
port on a RAC 60E, and a front-panel port on a DAC GE3. Customer traffic con-
nected to the DACs is bridged to the RACs, and then to the RF transceiver; the ODU
600.
Where required, customer data can also be sourced via the circuit-switched back-
plane, meaning both the DPP and backplane can be used to source/send traffic. This
has special relevance where native mixed-mode IP + TDM traffic is to be sent over an
Eclipse wireless link; GigE IP traffic via the DPP, and TDM traffic via the backplane.
Adaptive Coding and Modulation (ACM)
Advanced ACM options are provided using RAC 60E plug-in.
24 AVIAT NETWORKS