Aastra 470 System Manual page 42

Expansion Stages and System Capacity
Standard fan (fitted)
Redundant fan
unit as an option
(RFU)
Call Manager card
(CPU1)
Fig. 7 Aastra 470 basic system fitted with a redundant fan unit
42
Internal power supply
unit (PSU2U)
Backplane (BP2U)
Plug-in connections
for the interface
cards
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013