Power Supply Runtime Alarms - Avaya Media Processing Server 1000 Hardware Installation And Maintenance

Operation and Administration

Power Supply Runtime Alarms

The power supplies for a VRC chassis have several A/D converters used to monitor device
temperature as well as voltage and current for each output from the supply. A NIC is required to
access the A/D output from the supplies. the NIC monitors the output from each supply and
generates an alarm when a reading is out of tolerance.
Before the NIC can access the various outputs from the power supply A/Ds, the EEPROM on the
supply must be programmed. The EEPROM contains an entry that identifies the card type as a
power supply and its version. This information is required by the NIC to identify the device as a
power supply enabling it to monitor the voltage and current values. The version of the supply is
required so that the NIC applies the appropriate conversion factors based on the A/D chip set on the
supply. If the card type and revision are not programmed correctly, the NIC can report erroneous
values for temperature, voltage, and current.
In a VRC chassis, the NICs derive power from the TMS power supplies. The load added by the
NICs is distributed evenly between all supplies as long as the power switch is on.
Power Supply Temperature
Each power supply for a VRC chassis has a thermal chip monitored by the controlling NIC of the
chassis. Two alarm thresholds are defined for the power supply temperature, the low threshold
generates a minor alarm while the high a major alarm. The low temperature threshold gives an early
warning that a problem exists on the power supply. If the problem is resolved before the
temperature passes the high temperature threshold, the power supply operation is not affected. If
the temperature passes the high threshold, power supply operation can become unreliable and
eventually cause physical damage to the card.
The following modules can be affected:
• Power supply
• NIC
The power supply temperature can generate alarms due to the following conditions:
• improper ventilation
• faulty thermal chip on power supply
• hardware fault corrupting Temperature Bus
• incorrect conversion for temperature (cardtypes.cfg)
Troubleshooting
Use the NCD chassisinfo command to retrieve the power supply temperature, voltage, and current.
Then determine the course of action. A faulty A/D reports unusually high or low values.
Power Supply Voltage
Each power supply for a VRC chassis has an A/D attached to the voltage outputs from the supply.
The controlling NIC monitors these power supply voltages. A major alarm is generated if any voltage
is out of tolerance by 12 percent or more. Therefore, a major alarm is generated if the 5-volt supply
is at or below 4.4 volts or above 5.6 volts.
Avaya Media Processing Server 1000 Hardware Installation and Maintenance
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Comments? infodev@avaya.com
October 2014