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Maintenance Object Repair Procedures
555-233-123 10-378 Issue 4 May 2002
maintenance-related items that can be ignored for this section on Carrier Port
Power Unit). Figure 10-18 shows the position of the circuit breakers on the PDU
J58890CF. Figure 10-19 illustrates the position of the carrier power units and PDU
J58890CF-1 and shows which power unit each circuit breaker controls (Figure
10-19 also shows other Environment maintenance-related items that can be
ignored for this section on Carrier Port Power Unit). Figure 10-20 shows the
position of the circuit breakers on the PDU J58890CF-1. 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. The CARR-POW
(Carrier Port Power Unit) MO represents the pair of power units for 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 in the EPN can be recycled only if the
Active Expansion Interface Link and Active Tone-Clock circuit pack are in the A
carrier.
The carrier port power unit has one LED: the yellow LED on means operating as
normal and the LED off means no external power is being supplied or that the
power unit has a fault.
Loss of the 645B Carrier Port 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 carrier power units and turns them back on
two seconds later.
!
WARNING:
Recycling carriers disrupts service for all circuit packs on the carrier.
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 DC power to power the neon lights. The
165 volt DC power can only be supplied by a TN752 or a TN755B power unit
circuit pack. The following table lists the power units and power-related circuit
packs that can be used in a DC-powered system and indicates the voltages they
can supply.
Figure 10-21 on page 10-382 and Figure 10-22 on page 10-383 show
a schematic of the 644A and 645B power supplies, respectively. The TN2036
Voltage Range circuit pack provides easy access for testing the various voltages
on the backplane pins.