Alcatel-Lucent 7210 SAS-T User Manual

Hardware Description
Page 18 7210 SAS-T Installation Guide
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). 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.
The following table lists the conditions under which the system detects a power source failure.
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.
Table 6: Power Source Failure Detection Capability
Power Feed
#A
(Available/
Failed)
Power Feed
#B
(Available/
Failed)
Power
Supply in
Top Slot
(PS1)
Power
Supply in
Bottom
Slot
(PS2)
Alarm
Generated
(Yes/No)
Notes
Available Available DC DC No
Available Failed DC DC Yes PS2 input failure / PS2
output OK
Failed Available DC DC Yes PS1 input failure / PS1
output OK
Failed Failed DC DC No power to system
Available Available None DC No
Available Failed None DC Yes PS2 input failure / PS2
output OK

Alcatel-Lucent 7210 SAS-T Specifications

General

Brand	Alcatel-Lucent
Model	7210 SAS-T
Category	Switch
Language	English