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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Circuit Packs and Power
Page 2-6Power
2
Power
There are two basic powering options available with the Release 5si systems.
These options include AC and DC. The cabinets and their associated power
supplies can be powered by 120/208 volts AC either directly or from a Universal
Power Supply (UPS) system. Alternatively, the cabinets and their power supplies
may be powered by -48 volts DC from a battery power plant.
The Release 5vs system requires between 80 and 264 or between 90 and 132
volts AC. The system can be powered directly or from the WP-90510 power
supply. The DC power option is not available with this system.
Except for the Release 5vs system, each control cabinet in an AC-powered
system has an internal battery that provides a short term holdover to protect the
system against short power interruptions. This method is known as the Nominal
Power Holdover Strategy. The battery is connected so that it automatically
provides power if the AC service fails. The time and extent of the holdover varies
according to the type of cabinet and to whether or not the system has a
duplicated control complex.
Table 2-2
summarizes the response to the interruption of power service in
systems without an internal holdover battery.
The next two tables indicate various responses to the interruption of power
service in DEFINITY Systems equipped with an internal holdover battery.
Table 2-3
provides a summary of holdover times. Table 2-4 indicates the types of
cabinet power interruption based on power holdover durations.
Table 2-2. Response to Power Service Interruption (without Internal
Holdover Battery)
Cabinet Power
Interruption
Less Than Power
Supply Decay
Greater Than Power
Supply Decay
-48 volt DC external power
or multicarrier cabinet with
UPS, no internal battery.
None on system, some
impact on 48-volt
powered circuits.
All calls dropped,
system reloads.