Hirschmann MACH4000 Series, User Manual

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Installation MACH4000
Release 14 06/2013
Figure 11: M4-AIR and M4-AIR-L plug-in fans
Side and front views
1.4.2 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 independent of the ambient
temperature:
MACH4000 device Ambient - PCB
temperature difference with all
fans at full speed Ambient - PCB
temperature difference with all
fans at half speed
MACH4002-48+4G +15 K +20 K
MACH4002-24G/48G +20 K +27 K
Table 2: Ambient - PCB temperature difference at full and half fan speed
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