Avaya Definity SI, Maintenance Manual, Page: 1147 / 2968

CARR-POW (Carrier Port Power Unit) for AC-Powered
Systems
Issue 4 May 2002 10-361 555-233-123
fuses on the PDU and describes how to replace a fuse. The TN2036 Voltage
Range circuit pack provides easy access for testing the various voltages on the
backplane pins. For more information, refer to the “Troubleshooting Backplane
Voltage Problems” section found in Chapter 5, “Routine Maintenance
Procedures”.
The power unit has two LEDs: if the yellow LED is lit it means the power unit is
operating as normal; if the red LED is lit it means the power unit has a fault; and if
neither is lit it LED means no external power is being supplied. The CARR-POW
(Carrier Port Power Unit) MO represents the pair of power units that power each
carrier in a multicarrier cabinet system. If a problem is reported by hardware for a
power unit on a port carrier, the system can recycle the pair of power units in a
port carrier; however, if the problem is reported on a control carrier, the system
cannot recycle the pair of power units in a control carrier. In a standard multicarrier
cabinet (PPN or EPN) carrier A is the control carrier, and carriers B, C, D, and E
are the port carriers. In a High or Critical Reliability system multicarrier cabinet
(PPN or EPN), carriers A and B are the control carriers, and carriers C, D, and E
are the port carriers. However, carrier B can be recycled only if the Active
Expansion Interface Link and Active Tone-Clock circuit pack are in the A carrier.
Loss of the 631 DB Carrier Port DC Power Unit in the active control carrier (the A
carrier for a standard system and either the A or B carrier for a High or Critical
Reliability system) causes loss of the administration terminal. In a High or Critical
Reliability system, the Active SPE should switch to the Standby SPE if there is a
CARR-POW alarm.
Recycling a carrier turns off the pair of power units, and turns them back on two
seconds later.
!
WARNING:
Recycling carriers disrupts service for all circuit packs on the carrier.
The DEFINITY Generic 1 can also support neon message waiting lamps on
analog telephones. If this is required, then the carrier(s) that contains the TN769
Analog Neon circuit packs must also be supplied with 165 volt to power the neon
lights. The 165 volt can only be supplied by a TN752 or a TN755B power unit
circuit pack.
The following table lists all power unit and power-related circuit packs for the
system and indicates the voltages they can supply. Figure 10-12 through Figure
10-17 show a schematic of each power unit type. The TN2036 Voltage Range
circuit pack provides easy access for testing the various voltages on the
backplane pins. Refer to Chapter 2 in DEFINITY Communications System
Generic 1 and Generic 3 Installation and Test, 555-230-104.