Dc Power Source Failure Detection - Alcatel-Lucent 7210 Installation Manual

Hardware Description

DC power source failure detection

The 7210 platform provides capability to detect DC power source (-48V or +24V source) failure.
The 7210 chassis allows two DC power sources to be connected to the chassis. If the system
detects that the DC power source has failed, it raises a critical alarm (the Critical LED is lit and the
Critical Alarm output pin is triggered) and the system's status LED turns amber and blinks.. The
alarm is cleared if the DC power source is restored. There is no user configuration required to
enable this feature. The software enables this feature automatically by detecting the capability of
the hardware platform.
The system has two slots to plug in AC or DC power supplies. It associates the DC power supply
in top slot with power source feed #A (-48V or +24V Ret-A on the chassis) and DC power supply
in the bottom slot with power source feed #B (-48V or +24VRetB on the chassis). The system
detects the failure of power source feed #A only if the DC power supply is plugged into the top
slot. Similarly, the system detects the failure of power source feed #B only if the DC power supply
is plugged into the bottom slot. The trap message generated by the system indicates that there was
an input failure for the power supply associated with power input feed that failed.
Note: New traps needs to be explicitly enabled by the user and are suppressed by
default.
Notes: The power feeds are summed up internally before feeding the power supply units.
Hence, the DC power supply units will output power even if one of the power source feed is
available.
Note: Please check the release notes to know the software release that supports this feature.
Page 24 7210 SAS-M Installation Guide