Specifications

3-2
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 3 Configuring Catalyst 2955 Switch Alarms
Understanding Catalyst 2955 Switch Alarms
Global Status Monitoring Alarms
The Catalyst 2955 switch contains facilities for processing alarms related to temperature and power
supply conditions. These are referred to as global or facility alarms. Table 3-1 lists the three global
alarms and their descriptions and functions.
FCS Error Hysteresis Threshold
The Ethernet standard calls for a maximum bit error rate of 10
-8
. In the Catalyst 2955 switch, the bit
error rate configurable range is from 10
-6
to 10
-11
. The bit error rate input to the switch is a positive
exponent. If you want to configure the bit error rate of 10
-9
, then you enter the value 9 for the exponent.
By default, the FCS bit error rate is 10
-8
.
You can set the FCS error hysteresis threshold to prevent the toggle of the alarm when the actual bit error
rate fluctuates near the configured bit error rate. The hysteresis threshold is defined as the ratio between
the alarm clear threshold to the alarm set threshold, expressed as a percentage value.
Table 3-1 Catalyst 2955 Global Status Monitoring Alarms
Alarm Description
Power Supply Alarm The Catalyst 2955 switch monitors dual DC power supply levels. If the system is
configured to operate in a dual power mode, an alarm triggers if a power supply fails or
is missing. The alarm is automatically cleared when both power supplies are present or
working. You can configure the power supply alarm to be connected to the hardware
relays. For more information, see the “Configuring the Power Supply Alarm” section on
page 3-5.
Temperature Alarms The Catalyst 2955 switch contains a temperature sensor that monitors the environmental
conditions inside the switch. The switch contains two alarms that are associated with
temperature.
• The primary alarm is enabled automatically to trigger both at a low temperature
(-20
o
C) and a high temperature (95
o
C) for the safe operation of the switch. It cannot
be changed or disabled. By default, the primary temperature alarm is associated with
the major relay.
• You can use the secondary temperature alarm to trigger an alarm when the system
temperature is greater than the configured temperature threshold. The lower threshold
is configurable within the range of 40
o
C to the maximum threshold, 95
o
C. The
secondary alarm is disabled by default.
For more information, see the “Configuring the Switch Temperature Alarms” section on
page 3-6.