Tadiran Telecom Coral FlexiCom 6000, Инструкция по установке и справочник по аппаратной части

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Coral FlexiCom 6000 Installation Manual Power Supplies
7-1
PPS
Peripheral Power Su
pply Unit
7
7.1
PPS
Peripheral Power Supply Unit
The Power Supply (PPS) provides internal operating voltages for the
Coral FlexiCom 6000 peripheral shelves/cages.
The PPS operates from a nominal input of –48VDC, typically supplied by an external
48VDC rectifier or stationary battery plant. Actual input may vary from 42 to 58 volts
allowing operation:

From an external battery power source while the batteries are charged at an
equalized charge rate.

During a power failure, until the batteries are completely discharged.
The PPS contains three, pulse width modulated (PWM), switch-mode DC-DC
converters which convert the 48VDC input power to +5VDC, –5VDC,
+12VDC, and–12VDC operating voltages for the Coral internal circuitry. The PPS
also further filters and current limits the 48VDC input to feed the peripheral card slots.
All outputs except the –48VDC output are regulated. Voltage and current level
monitoring circuitry check each output of the PPS and produce alarm signaling to the
Coral system main processor in the event of abnormality.
Each PPS is designed with the capacity to support two fully populated peripheral
shelves (one Peripheral Shelf Unit) with an average mix of port types. The outputs of
the PPS are designed to be paralleled with the outputs of a second PPS, offering load
sharing of power supplies. Coral FlexiCom 6000 cabinets are factory wired to support
load sharing. In cabinets with only 2 peripheral shelves, the power supply slots of both
peripheral shelves are wired in parallel. In Main cabinets with 3 peripheral shelves, the
lower two peripheral shelves are wired in parallel, while the top peripheral shelf stands
alone. In cabinets with 4 peripheral shelves, the lower two peripheral shelves are wired
in parallel, and the upper two peripheral shelves are wired in parallel, regardless of
their even or odd numbering.
It is, however, possible to populate two peripheral shelves wired in parallel, in such a
way as to exceed the capacity of a single PPS. Station cards, in particular, place a
heavier load on the PPS than other card types. For such cases, a PPS must be installed
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1 General Description