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Nortel Secure Router 8012
Hardware Description 3 Heat dissipation system
Issue 5.3 (6 April 2009) Nortel Networks Inc. 3-3
Figure 3-2 Appearance of the fan front panel of the Secure Router 8012
FAN
DO NOT
TOUCH TH E
FAN LEAVE S
BEFORE THEY
SLOW DOWN
Don’t use this handle
to lift subrack
CAUTION
The warning indicators for the state of the fan module are located on the Routing Process Unit
(RPU) front panel.
Table 3-1 describes the fan module indicators on the RPU.
Table 3-1 Description of the fan module indicators
Name Color Description
Green Constant ON means the fan is operating normally. RUN
ALM
Red ON means an error occurred on the fan.
3.2 Functions
The revolution of the fan module is controlled by the RPU. Properly working fans keep the
Secure Router 8012 operating at the normal temperature. The fan module functions include
the following:
z
The fan module can modify the revolution automatically. It configures two parameters,
the low-temperature threshold and the high-temperature threshold. The low-temperature
threshold and the high-temperature threshold correspond with revs of 100% and 50%
respectively. For temperature operation requirements, see Chapter 1, “Overview.”
z
As the failure of one fan does not affect the operation of other fans, the system can still
operate at the normal temperature.
z
The system sends out rotation stop alarm signals if any fan fails.