Aastra 470 System Manual page 161

Detailed Description
The block diagram below illustrates how the EFOP fan-out-panel operates. The
lines are switched over by relays. When relays are in a de-energised idle state, the
emergency phones are connected directly with the analogue exchange lines
(PSTN). For each port the relay switching status is indicated by an LED.
Mains power 1
115/230 VAC
A C / D C
Mains power 2
115/230 VAC
A C / D C
Auxiliary
power suply
unit (APS2)
[1]
[1] relevant only with APS2 auxiliary power supply unit in redundancy operation
Fig. 66 Block diagram, EFOP fan-out-panel
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
EFOP
C o n tro l
1 ... 8
1 ... 8
V oltage
detec tion
1 ... 8
FXS
Communication server
Installation
PSTN
1 ... 8
1 ... 8
FXO
161