3Com 4007, Руководство по внедрению, Страница: 122 / 684

122 C
HAPTER
5: M
ANAGING THE
C
HASSIS
P
OWER AND
T
EMPERATURE
Overheat
Conditions
An overheat condition exists when one of the chassis temperature
sensors detects a chassis internal operating temperature that exceeds a
predefined threshold. The allowable ambient temperature operating
range is 0 °C through 50 °C (32 °F through 122 °F). The default threshold
setting is fixed at an upper limit of 60 °C (140 °F) or higher to prevent
module damage.
Cooling loss or excessively high ambient (room) air temperature can cause
an overheat condition.
The following events occur during an overheat condition:
1 The Primary EME character display shows the word
TEMP
2 If an SNMP agent is present in the chassis, power management informs
the SNMP agent of the overheat condition.
3 A 1-minute delay is provided, during which the Primary EME and external
management entities are notified of the overheat condition.
4 Approximately 1 minute later, the EME initiates a power-off strategy to all
modules installed in the overheat management areas where the overheat
condition was detected.
5 The overheat indication
TEMP
stops when the chassis internal operating
temperature falls below the temperature threshold and stays there for
15 minutes.
The EME does not power off modules that occupy slots outside of
affected overheat management areas. This overheat power-off strategy is
based on the power class setting and slot location of each installed
switching module.