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Expansion Stages and System Capacity
35
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
For a clearer overview the figure below shows the open communications server
from above with an additional fan fitted. The housing cover is in two parts. The up-
per, rear cover is removed for the purpose of fitting an additional fan (see
for the procedure).
Fig. 7
Aastra 470 basic system fitted with a redundant fan unit
Plug-in connections
for the interface
cards
Backplane (BP2U)
Internal power supply
unit (PSU2U)
Call Manager card
(CPU1)
Standard fan (fitted)
Redundant fan
unit as an option
(RFU)