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DC-POWER
Issue 4 May 2002 10-515 555-233-123
DC-POWER
Single-Carrier Cabinet Power
NOTE:
For environment maintenance, the high or critical reliability system, PPN, or
EPN cabinet configuration aspects are irrelevant.
The DC-POWER MO represents all the environmental maintenance for a
single-carrier cabinet system. It includes an external power unit and all the port
power units in the Port Network. The external power unit can be either a DC or an
AC power source. If the external power unit is AC, then the Carrier Port Power
Units must be WP-91153 power units. If the external power unit is DC, then the
Carrier Port Power Units must be 676B power units. If the hardware detects a
problem with any one of these elements, it reports the information to the system
software through a single lead. The system software cannot differentiate between
different environmental failures. All environmental alarms on a single-carrier
cabinet system are logged as a major DC-POWER alarm. Therefore, it is possible
to get a DC-POWER alarm when there is still power to the system. The yellow
LED on the power unit means operating as normal. If the LED is off, no external
power is being supplied or that the power unit has a fault.
NOTE:
Physically removing a Carrier Port Power Unit from a single-carrier cabinet
system does not raise a DC-POWER alarm. The removal of the power unit
is equivalent to the carrier being physically absent since DC-POWER
maintenance cannot distinguish between these two situations.
A single-carrier cabinet system powered by an AC external power source with
WP-91153 Carrier Port Power Units has a minimal Nominal Power Holdover
(NPH) for the PPN only in standard, high, and critical reliability systems. There is
no NPH for a DC- powered PPN or for an AC- or DC-powered EPN. NPH in the
PPN of an AC-powered system without high or critical reliability provides full
powering for 0.25 seconds, and power to the control complex for an additional two
minutes.
!
WARNING:
Before powering down a cabinet or carrier that contains EMBEDDED AUDIX
circuit packs (TN566), first power down the AUDIX unit to avoid damaging
the AUDIX software. Instructions for powering down this unit are in the
“EMBEDDED AUDIX System Power Procedures” in Chapter 5, “Routine
Maintenance Procedures”, on the circuit pack, and in EMBEDDED AUDIX
documentation.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
1 Where P is an appropriate port network number determined from the PORT field of the alarm log.
Full Name of MO
DC-POWER MAJOR test environment P Single-Carrier Cabinet Power