22
MACH 4000
Release 11/08
Note: Devices with the M4-AIR-L plug-in fan are suitable for use in an ambi-
ent temperature up to a maximum of +40 °C.
Figure 7: M4-AIR and M4-AIR-L plug-in fans
Side and front views
1.3.2
Monitoring temperature and fan
Fan monitoring
Every individual fan sends a speed-dependent signal to the basic system.
The fan monitoring displays the failure of one or more
individual fans.
The effect of insufficient ventilation
If the device is insufficiently ventilated by its fans, this either causes the
assemblies to age faster (MTBF value) or triggers error statuses, and it
usually leads to transmission errors on the Ethernet connections.
Temperature difference
The difference between the ambient temperature and the circuit board
(PCB) temperature is primarily dependent on the ambient
temperature:
P
P1
P2
P3
P4
RM
RL1
RL2
FAN
RUN
L/D
FDX
1000
AN
TP/FO
RING
PORT STBY
LED
TEST
PoE
1
1
2
3
4
LED
MEDIA SLOTS
M4-AIR
SLOT.PORT
M4-AIR
P
P1
P2
P3
P4
RM
RL1
RL2
FAN
RUN
L/D
FDX
1000
AN
TP/FO
RING
PORT STBY
LED
TEST
PoE
1
1
2
3
4
LED
MEDIA SLOTS
M4-AIR-L
SLOT.PORT
M4-AIR-L
Summary of Contents for HIRSCHMANN MACH 4000 Series
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